US Pat. No. 9,494,190

BEARING ASSEMBLY WITH OVERLOAD PROTECTION

SIMMONDS PRECISION PRODUC...

1. A bearing assembly for providing engagement of a rotor and a support, comprising:
a shaft;
an inner race affixed to the shaft;
an outer race disposed radially around the inner race, the inner and outer races together defining a bearing run space between
the inner and outer races; and

rolling elements in the bearing run space;
wherein one of: (i) the shaft along with the inner race or (ii) the outer race, is attached to and configured to rotate with
the rotor, and the other of (i) the shaft along with the inner race or (ii) the outer race, is attached to the support;

a first axial bore that is in the rotor if the outer race is the rotor or is in the support if the outer race is attached
to the support;

a second axial bore that is in the support if the outer race is attached to the rotor or is in the rotor if the outer race
is attached to the support; and

wherein a first portion of the outer race is disposed in the first axial bore, and a second portion of the outer race is disposed
in the second axial bore with a radial gap between a wall of the second axial bore and the second portion of the outer race;
and

further wherein the assembly is configured to provide a radial displacement between the second portion of the outer race and
the second axial bore wall in response to a radial overload force applied to the rotor.

US Pat. No. 9,621,292

DETERMINISTIC SCHEDULING ALGORITHM FOR WIRELESS COMMUNICATION

SIMMONDS PRECISION PRODUC...

1. A system to implement a scheduling algorithm in a communication network using time division multiple access (TDMA), the
system comprising:
a plurality of devices, each device transmitting a packet of data in the communication network;
a memory device configured to store the scheduling algorithm; and
a processor configured to execute the scheduling algorithm to form a deterministic packet scheduling scheme, the deterministic
packet scheduling scheme being based on a base unit (BU) representing a minimum among maximum packet intervals (MPI) corresponding
to the plurality of devices in the communication network.

US Pat. No. 9,838,910

CHANNEL MANAGEMENT IN WIRELESS NETWORKS

Simmonds Precision Produc...

1. A channel management method, comprising:
determining utilization of a primary wireless channel;
determining utilization of a secondary wireless channel;
comparing utilization of the primary wireless channel with utilization of the secondary wireless channel;
designating the primary wireless channel a new secondary wireless channel;
designating the secondary wireless channel a new primary wireless channel; and routing wireless data communication between
a remote data concentrator and a wireless node from the primary wireless channel to the secondary wireless channel if the
utilization of the secondary wireless channel is lower than the utilization of the primary wireless channel,

wherein designating the secondary wireless channel a new primary wireless channel includes switching a transceiver monitoring
the secondary wireless channel into an active mode, wherein the transceiver transmits and receives data communication over
the new primary wireless channel.

US Pat. No. 9,520,919

MAGNETIC WIRELESS GROUND DATA LINK FOR AIRCRAFT HEALTH MONITORING

SIMMONDS PRECISION PRODUC...

1. A method of communicating a signal, comprising:
determining that aircraft-based coil is within a selected volume defined by a ground-based coil fixed in the ground, wherein
the ground-based coil fixedly located underneath a ground surface;

modulating a current in one of the aircraft-based coil and the ground-based coil to generate a magnetic field in the volume;
and

communicating the signal by measuring a current generated in the other of the aircraft-based coil and the ground-based coil
in response to the generated magnetic field.

US Pat. No. 9,694,900

ACTUATORS FOR FLIGHT CONTROL SURFACES

Simmonds Precision Produc...

1. An air vehicle, comprising:
a flight surface;
a wing tip with a flight control surface outboard of the flight surface; and
an actuator assembly coupling the control surface to the flight surface, including:
an actuator body with a wall bounding an internal axial cavity and a longitudinal slot, wherein the longitudinal slot is communicative
with the axial cavity through the wall;

a ram slidably received within the axial cavity; and
a cross pin mounted to the ram and extending laterally from the ram into the longitudinal slot, wherein the actuator body
defines a pivot axis and wherein the cross pin and longitudinal slot are configured to convert linear motion of the ram into
rotational motion about the pivot axis for deflecting the control surface in relation to the flight surface,

wherein the ram has an axial length that is greater than an axial length of the longitudinal slot of the actuator body,
wherein the longitudinal slot is parallel with the pivot axis, and
wherein the control surface includes a pin-receiving slot with an inclined or helical shape defined in the control surface.

US Pat. No. 9,330,316

SENSOR LOCATION AND LOGICAL MAPPING SYSTEM

SIMMONDS PRECISION PRODUC...

1. A system to locate and map a data collection device included with the system comprising:
at least one image included with at least one of a subsystem and a component monitored by the system;
at least one smart sensor configured to detect a stimulus and to capture the at least one image, and configured to output
an image signal indicating the at least one image; and

a main control module in electrical communication with the at least one smart sensor, the main control module configured to
determine the image based on the image signal, compare the at least one image to a stored image, and to authenticate the at
least one image in response to the at least one image matching the stored image,

wherein the main control module determines a location of the image based on the image signal generated by the at least one
smart sensor, and determines that the location of the at least one sensor is incorrect when the at least one image does not
match the stored image.

US Pat. No. 9,154,249

SYSTEM AND METHOD FOR SYNCHRONIZING WIRELESS DEVICES WITHOUT SENDING TIMESTAMP DATA

Simmonds Precision Produc...

1. A method for synchronizing a plurality of wireless devices without exchanging timestamp information, wherein each wireless
device has a clock, the method comprising the steps of:
receiving, at the plurality of wireless devices, a series of data acquisition requests having a predefined time interval between
the data acquisition requests, wherein each data acquisition request includes an index;

recording timestamps of receipt for each received request according to the clock of each wireless device;
determining a clock value to start data acquisition for each timestamp at each wireless device based on the timestamps, the
respective index, and the predefined time interval; and

selecting a minimum clock value for each wireless device from the respective clock values as an instant to start data acquisition
for the respective wireless device.

US Pat. No. 9,661,767

MULTIPLE POSITION MOUNT WITH RETAINING MECHANISM

Simmonds Precision Produc...

1. A mount for holding a display device, the mount comprising:
a main support comprising a front surface and a rear surface;
a plurality of arms extending from a periphery of the main support, wherein the main support and the plurality of arms are
configured to retain the display device; and

a locking assembly connected to the rear surface of the main support, wherein the locking assembly is configured to secure
the display device, the locking assembly comprising:

a locking arm translatable relative to the main support, wherein the locking arm is configured to support the display device
in a secured position; and

a locking mechanism connected to the locking arm comprising:
a lever connected to the locking arm for releasing the locking mechanism, wherein the locking mechanism prevents the locking
arm from translating from the secured position, the lever comprising a first end that is actuatable to release the locking
mechanism and a spring retainer connected to a second end of the lever; and

a spring that applies force on the lever.

US Pat. No. 9,555,710

DEEP FILTERING OF HEALTH AND USAGE MANAGEMENT SYSTEM (HUMS) DATA

Simmonds Precision Produc...

1. A system for filtering data, comprising:
a computing device including a processor and a memory storage device, the processor being configured to execute a query module
operatively coupled to a data module and to a display module;

wherein the data module is configured to access vehicle data in a database according to a query input;
wherein the display module is operatively coupled to the data module and is configured to display the vehicle data in a graphical
user interface; and

wherein the query module is operatively coupled to the data module and to the display module, and the query module is configured
to generate the query input according to an interactive list of filter statements, each filter statement in the interactive
list of filter statements being selectable from a group of filter types, the group of filter types being configured to dynamically
update in response to at least one selection from the group of filter types.

US Pat. No. 9,137,638

LOGICAL TO PHYSICAL MAPPING OF WIRELESS NETWORK COMPONENTS

SIMMONDS PRECISION PRODUC...

1. A system for evaluating a physical location of a node in a network within an aircraft comprising:
a reference node having a reference accelerometer installed in a reference orientation;
a first node accelerometer coupled to a component and installed at a first location and in a first node orientation relative
to the reference orientation;

a memory configured to store the first node orientation and an initial acceleration vector of the first node accelerometer;
and

a controller configured to receive a current node acceleration vector associated with the first node accelerometer and a current
reference acceleration vector associated with the reference accelerometer, determine a current node orientation by comparing
the current node acceleration vector to the current reference acceleration vector, and to determine whether a current orientation
of the component relative to the reference node has changed by comparing the first node orientation and the current node orientation.

US Pat. No. 10,082,520

ROTATIONAL FREQUENCY ESTIMATION FROM SENSED VIBRATIONS BASED ON A SUPERVISED LEARNING METHOD

Simmonds Precision Produc...

1. An apparatus for estimating, using a frequency spectrum weighing function, a rotational frequency of a rotating member, the apparatus comprising:an accelerometer;
one or more processors; and
one or more storage devices encoded with instructions that, when executed by the one or more processors, cause the apparatus to perform the steps of:
a) calculating, using the one or more processors, a frequency spectrum weighting function;
b) storing, in one or more storage devices, the frequency spectrum weighting function;
c) retrieving, from one or more storage devices, the frequency spectrum weighting function;
d) receiving, from the accelerometer, temporal signals indicative of vibrations, the vibrations sensed by the accelerometer remotely located from the rotating member;
e) transforming, by the one or more processors, the temporal signals indicative of the vibrations to a vibrational frequency spectrum;
f) calculating, by the one or more processors, a weighted vibrational frequency spectrum by taking a product of the vibrational frequency spectrum and the frequency spectrum weighting function;
g) selecting, by the one or more processors, a frequency corresponding to a maximum amplitude of the weighted vibrational frequency spectrum; and
h) identifying, by the one or more processors, the frequency corresponding to the maximum amplitude of the weighted frequency spectrum as the rotational frequency of the rotating member.

US Pat. No. 9,429,402

MULTI-STAGE DRIVE MECHANISMS

Simmonds Precision Produc...

1. A multi-stage drive for deploying and controlling a control surface comprising:
a linear actuator configured for linear movement along an actuation axis; and
a control surface operatively connected to the linear actuator for rotation about a deployment axis in a deployment stage,
and for rotation in a control stage about a control axis that is different from the deployment axis, so that movement of the
linear actuator along the actuation axis drives rotation of the control surface in both the deployment stage and in the control
stage; and

a lock operatively connected to the linear actuator and control surface to lock the control surface against rotation around
the control axis in the deployment stage, and to lock the control surface against rotation around the deployment axis in the
control stage, wherein the lock includes a link having a first end operatively connected to the control surface for rotation
of the control surface around the control axis, wherein the link further includes a second end engaging a swivel cap, and
wherein the swivel cap includes a rim that prevents movement of the second end of the link beyond the swivel cap in the deployment
stage to prevent movement of the link about the control axis, and wherein the rim of the swivel cap includes a notch that
permits movement of the second end of the link in the control stage to allow rotation of the link about the control axis.

US Pat. No. 9,102,419

DETERMINING ROTORCRAFT COLLECTIVE ADJUSTMENT DURING GROUND TEST

Simmonds Precision Produc...

1. A computer-implemented method for evaluating collective alignment of rotor blades of an aircraft, the method comprising:
determining, by a processor, a collective alignment condition of the rotor blades based on data received from an auto-rotation
test flight of the aircraft;

determining, by the processor, a first engine torque value for the aircraft while the aircraft is on the ground and the aircraft
rotor blades are operated at a normal speed;

associating, by the processor, the first engine torque value with the determined collective alignment condition;
determining, by the processor, a second engine torque value for the aircraft while the aircraft is on the ground and the aircraft
rotor blades are operated at the normal speed; and

providing, by the processor, an indication of the collective alignment condition when the second engine torque value is within
a tolerance limit of the first torque value.

US Pat. No. 9,793,991

OPTICALLY INTERFACED REMOTE DATA CONCENTRATOR

Simmonds Precision Produc...

9. A remote sensing system comprising:
an optical link;
a plurality of remote sensors configured to obtain sensed data; and
a data concentrator comprising:
a first interface configured to receive power from the optical link;
a plurality of controllers configured to store the power received from the optical link;
a second interface configured to provide the power to the plurality of remote sensors and receive the sensed data from the
plurality of remote sensors, wherein the second interface includes a plurality of back end interfaces that each receive the
power from a respective one of the plurality of controllers;

wherein the first interface is further configured to provide the sensed data optically to the optical link.

US Pat. No. 10,048,186

OPTICALLY INTERFACED FLUID DENSITY SENSOR

Simmonds Precision Produc...

1. A fluid density sensor configured to optically receive operating power and to optically communicate a measured fluid density, the fluid density sensor comprising:a fluid tight housing separating an interior cavity from an exterior environment, the fluid tight housing configured to prevent a fluid from the exterior environment from entering the interior cavity;
a fiber optic connection port configured to connect to an optical fiber in the exterior environment while providing an optical path for light energy to traverse the fluid tight housing, the light energy communicated between the optical fiber and the interior cavity;
a fluid density transducer in the housing configured to be immersed in the fluid, the fluid density transducer generating an electrical output signal indicative of a density of the fluid; and
sensor electronics located entirely within the interior cavity, the sensor electronics comprising:
an optical power converter configured to convert the light energy communicated from the optical fiber via the fiber optic connection port into DC electrical energy;
an energy storage device configured to store the converted DC electrical energy;
a signal generator configured to generate, using at least a portion of the stored DC electrical energy, an electrical input signal for use by the fluid density transducer;
a transducer interface configured to supply the generated electrical input signal to the fluid density transducer and to receive the electrical output signal of the fluid density transducer; and
an optical signal generator configured to generate a light signal, based on the received electrical output signal, the light signal indicative of the density of the fluid,
wherein the optical signal generator is configured to generate a light signal indicative of the density of the fluid by modulating a reflection of the light energy delivered by the optical fiber, and the reflected light signal is communicated by the optical fiber in a direction antiparallel to the direction of the unreflected light energy carried by the optical fiber.

US Pat. No. 9,794,126

DATA COMPRESSION OF A SEQUENCE OF BINARY DATA

Simmonds Precision Produc...

1. A binary data encoding system for compressing a sequence of binary data, the binary data encoding system comprising:
a microprocessor; and
computer-readable memory encoded with instructions that, when executed by the microprocessor, cause the binary data encoding
system to:

receive a sequence of words of binary data;
compare pairs of adjacent words of the sequence, and to determine a difference between a second word and a first word of each
of the pairs of adjacent words;

select a subword size from a set of predetermined subword sizes, the selected subword size being a minimum one of the set
of predetermined subword sizes that are capable of representing the determined difference between the second word and the
first word of each of the pairs of adjacent words;

generate a size tag and a corresponding subword of the selected subword size, the size tag indicative of the selected subword
size and the corresponding subword representing the determined difference between the second word and the first word of each
of the pairs of adjacent words; and

output the generated size tag and subword.

US Pat. No. 9,638,601

SYSTEMS AND METHODS FOR DETERMINING ROTARY BLADE TRACK AND BALANCE ADJUSTMENTS

Simmonds Precision Produc...

1. A method of adjusting track and balance of a rotary blade, comprising:
receiving performance data for a rotary blade;
establishing at least one threshold for the rotary blade;
defining an adjustment solution search tree;
selecting a first adjustment solution from the search tree for evaluation;
evaluating the first adjustment solution using the threshold;
determining whether to evaluate a second adjustment solution from the search tree based on the evaluation of the first adjustment
solution;

determining a number of adjustments for the selected first adjustment solution;
comparing the number of adjustments for the selected first adjustment solution with the threshold for the rotary blade;
pruning the first adjustment solution based on the determined number of adjustments and threshold comparison;
selecting a second adjustment solution from the search tree for evaluation; and
adjusting track and balance of the rotary blade according to one of the first adjustment solution and the second adjustment
solution.

US Pat. No. 10,564,022

AIRCRAFT FUEL GAUGING METHOD USING VIRTUAL PROBES

Simmonds Precision Produc...

11. A fuel gauging system for an aircraft comprising:a fuel tank containing a plurality of physical probes;
a data concentrator configured to receive signals from the plurality of physical probes;
an avionics system configured to calculate attitude of the aircraft; and
a fuel quality processing unit designed to receive data from the data concentrator and the avionics system, the fuel quality processing unit configured to calculate a total volume of fuel in the fuel tank based on received signals from the plurality of physical probes indicative of the heights of fuel relative to the plurality physical probes, simulated signals from a plurality of virtual probes indicative of the heights of fuel relative to the plurality virtual probes, and the attitude of the aircraft
wherein the fuel quality processing unit is configured to determine a height of fuel in the fuel tank relative to each of the plurality of physical probes by:
calculating a fractional fuel coverage relative to each of the plurality of physical probes;
calculating an effective top for each of the plurality of physical probes;
calculating an effective bottom for each of the plurality of physical probes; and
calculating a height of fuel in the fuel tank relative to each of the plurality of physical probes using the fractional fuel coverage, the effective top, and the effective bottom.

US Pat. No. 9,726,705

SENSOR INTERFACE CIRCUITS

Hamilton Sundstrand Corpo...

1. A sensor interface circuit, comprising:
first and second input terminals;
a resistive bridge circuit including a pair of parallel resistive branches connected between the first and second input terminals,
both resistive branches including an output terminal disposed between serially arranged resistors of the resistive branches;

a first switch connected to the first input terminal and in series with the resistive branches for connecting a first voltage
source to both resistive branch output terminals;

a second switch connected to the second input terminal and in series with the resistive branches for connecting a second voltage
source to both resistive branch output terminals;

a first voltage source connected to the first input terminal through the first switch;
a second voltage source connected to the second input terminal through the first switch; and
a voltage differential measurement module connected to the resistive branch output terminals
wherein the sensor interface circuit has a first configuration and a second configuration, the first switch being closed and
the second switch being open in the first configuration, the first switch being open and the second switch being closed in
the second configuration,

wherein the differential measurement module is compare a differential voltage measurement acquired in the first configuration
with a differential measurement acquired in the second configuration to determine at least one of magnitude and leakage in
the circuit.

US Pat. No. 9,921,150

IMAGING SYSTEM FOR FUEL TANK ANALYSIS

Simmonds Precision Produc...

1. A method comprising:
transmitting, from a light source, light through a fuel tank ullage;
receiving the transmitted light at an image sensing device;
determining, by a processing device coupled to the image sensing device, an amount of absorption of at least one wavelength
of the transmitted light;

determining, by the processing device based on the amount of absorption of the at least one wavelength of the transmitted
light, a chemical composition of the fuel tank ullage, wherein determining the chemical composition of the fuel tank ullage
comprises determining presence of a constituent in the fuel tank ullage based on the determined amount of absorption of the
at least one wavelength; and

determining, based on the determined presence of the constituent in the fuel tank ullage, an operational status of an inert
gas generating system configured to produce oxygen-depleted air for the fuel tank ullage;

wherein determining the presence of the constituent in the fuel tank ullage based on the determined amount of absorption of
the at least one wavelength comprises determining an amount of the constituent present in the fuel tank ullage based on the
determined amount of absorption of the at least one wavelength; and

wherein determining the operational status of the inert gas generating system comprises determining the operational status
corresponding to a failure mode of the inert gas generating system in response to determining that the amount of the constituent
present in the fuel tank ullage deviates from one or more threshold acceptability criteria.

US Pat. No. 9,897,516

DATA ACQUISITION SYSTEM FOR CONDITION-BASED MAINTENANCE

Simmonds Precision Produc...

1. A data acquisition system for monitoring one or more components of a rotating machine having a plurality of separate components,
the data acquisition system comprising:
a plurality of separate sensor modules associated with the machine, each of the plurality of separate sensor modules being
associated with a separate respective component of the plurality of separate components of the machine and including:

a sensor configured to detect a parameter associated with a condition of the separate respective component and to provide
sensor data based on the detected parameter; and

an interface module coupled to the sensor and configured to receive the sensor data from the sensor and to generate module
output data based on the received sensor data, the module output data comprising a representation of the condition of the
separate respective component; and

a data bus configured to couple each of the plurality of separate sensor modules to a server, wherein the server is configured
to provide an estimate of remaining useful life of a selected one of the separate respective components of the rotating machine
to a user.

US Pat. No. 9,243,979

SYSTEM AND METHOD FOR ADJUSTMENT RESPONSE ANALYSIS

SIMMONDS PRECISION PRODUC...

1. A method comprising:
receiving, by a processor that is coupled to at least one of a sensor coupled to a helicopter or the helicopter and configured
to determine effects to the helicopter of an actual adjustment that was made to a component of the helicopter, an actual adjustment
result including measured data from the component after the actual adjustment has been performed;

determining, by the processor, a permutation of an available adjustment, the available adjustment including at least one potential
adjustment that may be made to the component;

determining, by the processor, an expected result corresponding to expected effects to the helicopter for the permutation
of the available adjustment from a measured start point corresponding to a point prior to the actual adjustment being performed;

determining, by the processor, an error measured from the actual adjustment result as compared with the expected result for
the permutation of the available adjustment;

identifying, by the processor, the actual adjustment that was made to the component based on the error; and
displaying, by a display, data identifying the actual adjustment that was made.

US Pat. No. 9,933,097

RING COUPLINGS

Simmonds Precision Produc...

1. A ring coupling comprising:a first cylindrical body defining an outward facing coupling surface extending in a circumferential direction;
a second cylindrical body defining an inward facing coupling surface extending in the circumferential direction; and
a retainer ring engaged to the coupling surfaces of the first and second cylindrical bodies to prevent axial disengagement of the first and second cylindrical bodies;
wherein the retainer ring is flexible between: a first position seated in the coupling surface of the second cylindrical body to clear the first cylindrical body for assembly of the first and second cylindrical bodies together; and a second position flexed radially inward from the first position to engage the coupling surface of the first cylindrical body; and
further comprising a plurality of set screws threaded to the second cylindrical body to maintain the retainer ring in the second position;
wherein in the second position portions of the retainer ring proximate to the set screws are in engagement with the coupling surface of the first cylindrical body, wherein portions of the retainer ring circumferentially between the set screws are biased outward into engagement with the coupling surface of the second cylindrical body.

US Pat. No. 9,910,025

INTEGRATED ACTIVE FUEL CHARACTERISTIC SENSOR

Simmonds Precision Produc...

1. An integrated sensor assembly for use on an aircraft fuel system comprising:
the integrated sensor assembly incorporating a housing, said housing receiving a circuit board, a temperature sensor, a point
level sensor and a fuel density sensor;

a first fuel height sensor positioned outside of said housing;
wherein there is a second fuel height sensor, and said second fuel height sensor determines a dielectric constant of the fuel
and utilizes it to determine fuel height;

wherein said second fuel height sensor is also positioned outside of said housing;
wherein said first fuel height sensor includes a pair of coaxial tubular members having an outer surface, with an outer one
of said tubular member having a cylindrical outer surface, and said housing having a part cylindrical portion received on
said cylindrical outer surface; and

wherein said housing also having a flat plate, and there being tabs on one of said cylindrical outer surface and an inner
surface of said flat plate, and there being depressions in the other of said cylindrical outer surface and said inner surface
with said tabs being received within said depressions to secure said housing on said cylindrical outer surface.

US Pat. No. 9,179,570

MULTI CONNECTOR INTERCONNECT SYSTEM

Simmonds Precision Produc...

1. A circuit card assembly for a line replaceable unit comprising:
a) a critical function circuit card assembly body including on board electronics;
b) at least one input output connector mounted to the critical function circuit card assembly body in electrical communication
with the on board electronics; and

c) at least one backplane connector mounted to the critical function circuit card assembly body in electrical communication
with the on board electronics, the at least one backplane connector being configured and adapted to electrically connect the
on board electronics to a backplane circuit card assembly for communication among multiple critical function circuit card
assemblies while providing electro-mechanical isolation for the multiple critical function circuit card assemblies from one
another.

US Pat. No. 10,132,849

TWO WIRE POWER AND SERIAL COMMUNICATION

Simmonds Precision Produc...

1. A method of communicating power and data between an inboard computer and an outboard computer, the method comprising:driving, by the inboard computer, a power signal through a first isolation transformer;
receiving, by the outboard computer, the power signal through a second isolation transformer;
powering a processor of the outboard computer using the received power signal;
selectively connecting, by the processor of the outboard computer, a load connected across the second isolation transformer to transmit data to the inboard computer; and
monitoring, by the inboard computer, a current through the first isolation transformer to receive the data from the outboard computer.

US Pat. No. 10,056,991

REMOTE DATA CONCENTRATOR SELF-TEST

Simmonds Precision Produc...

1. A remote data concentrator (RDC), comprising:an enclosure having an interior divided into a first compartment and a second compartment configured to have a first transceiver seated within the first compartment and a second transceiver seated within the second compartment such that radio frequency (RF) energy transmitted from the first transceiver is blocked from reaching the second transceiver in a direct line of sight fashion, thereby allowing operational testing of the RDC without requiring wireless transmitting or receiving devices external to the RDC;
a first antenna operatively connected to the first transceiver and arranged within the first compartment; and
a second antenna operatively connected to the second transceiver and arranged within the second compartment,
wherein an antenna pattern of the first antenna overlaps an antenna pattern of the second antenna outside of the enclosure for RF communication when the first and second transceivers are switched to a common wireless channel.

US Pat. No. 10,136,341

WIRELESS DATA CONCENTRATOR SYSTEMS AND METHODS

Simmonds Precision Produc...

1. A computer implemented method, comprising:transmitting a transmit command to a first data concentrator to send out a predetermined signal of predetermined characteristics according to a transmission setting;
receiving a received signal from at least one second data concentrator;
determining if there are any signal transmission effects between the first data concentrator and the second data concentrator based on a comparison of the predetermined signal and the received signal; and
receiving an aircraft startup signal before transmitting the transmit command to cause the method to be performed with every aircraft startup.

US Pat. No. 9,909,967

FUEL DENSITY DETERMINATION

Simmonds Precision Produc...

1. An assembly used for determining a density of a fuel, the assembly comprising:
a density sensor located at a first location, wherein the density sensor is configured to measure a density of the fuel at
the first location;

a first dielectric sensor located at the first location, wherein the first dielectric sensor is configured to measure a dielectric
constant of the fuel at the first location;

a second dielectric sensor located at a second location downstream of the first location, wherein environmental conditions
at the second location differ from environmental conditions at the first location and wherein the second dielectric sensor
is configured to measure a dielectric constant of the fuel at the second location; and

a fuel line connecting the first location to the second location;
wherein the density of the fuel at the second location is inferred based on the measured density and dielectric constant at
the first location, the measured dielectric constant at the second location, and dielectric versus density characteristics
of the fuel at the first location.

US Pat. No. 10,579,080

INTELLIGENT ICE PROTECTION NETWORK

Simmonds Precision Produc...

1. A system for an aircraft, comprising:a first fluid circuit extending from a first end to a second end;
a network comprising a plurality of networked heater assemblies disposed along the first fluid circuit between the first end and the second end, each of the networked heater assemblies comprising:
at least one temperature sensor in communication with the first fluid circuit for periodically measuring a temperature in the first fluid circuit and generate a corresponding local temperature signal;
a heater element configured to selectively apply heat to the first fluid circuit based on the local temperature signal or another temperature signal on the network;
a local controller programmed to receive the local temperature signal or another networked temperature signal and operate the heater assembly in response thereto in order to maintain the local temperature signal above a predetermined threshold;
wherein upon determination that the at least one temperature sensor has failed, the local controller is configured to communicate such determination to a local controller in at least another one of the networked heater assemblies, such that at least one of the remaining operative temperature sensors are polled at a second polling frequency greater than or equal to a first polling frequency corresponding to normal operation of the overall system.

US Pat. No. 9,978,137

IMAGING SYSTEM FOR FUEL TANK ANALYSIS

Simmonds Precision Produc...

1. A method comprising:generating reference image data of an interior of a fuel tank disposed within a wing of an aircraft;
generating active image data of the interior of the fuel tank when the fuel tank contains fuel;
determining, by a processing device, an amount of wing bending of the wing of the aircraft based on the generated active image data and the reference image data of the interior of the fuel tank;
producing, by the processing device, a fuel measurement value representing an amount of fuel contained in the fuel tank based on the amount of wing bending of the wing of the aircraft; and
outputting, by the processing device, an indication of the fuel measurement value.

US Pat. No. 9,696,232

SYSTEMS AND METHODS FOR TRACK AND BALANCE VISUALIZATION

Simmonds Precision Produc...

1. A method of adjusting track and balance of a rotary blade, comprising:
receiving data indicating track and balance of a rotary blade of interest;
determining a first performance level based on the received data, wherein the first performance level is indicative of track
and balance performance of the rotary blade of interest;

receiving a constraint, wherein the constraint includes a one or more user-selected trimming adjustment for exclusion from
a constrained adjustment solution provided by the adjustment algorithm;

determining a second performance level based on the received constraint and the received data, wherein the second performance
level is representative of expected track and balance performance by trimming the rotary blade of interest according to a
constrained adjustment solution provided by the adjustment algorithm;

displaying on a display unit the first and second performance levels for visualizing differences between the first and second
performance levels; and

trimming the rotary blade using the constrained adjustment solution.

US Pat. No. 10,395,811

INDUCTIVE SENSOR TUNING USING A PERMEABLE PASTE MIXTURE

Simmonds Precision Produc...

1. An inductive sensor comprising:an annular core body comprising a first end adjacent an active face of the sensor and a second end axially opposite the first end;
a coil wound on the core body;
a central axial cavity extending fully through the core body from the first end to the second end, the cavity having a height and a cross-sectional area that together define a fixed volume; and
a tuning material situated within the cavity and extending axially from the first end through a subset of the height and occupying the entire cross-sectional area along the subset of the height such that it fills a controlled portion of the fixed volume ranging from twenty-five percent to two-thirds of the fixed volume;
wherein the tuning material comprises a mixture of an epoxy material and at least one of a soft magnetic or paramagnetic material;
wherein a coefficient of thermal expansion of the tuning material and the core body is the same; and
wherein the controlled portion of the fixed volume filled with the tuning material controls an inductance of the sensor.

US Pat. No. 9,951,758

ROTATIONAL ACTUATORS

Simmonds Precision Produc...

1. An actuator comprising:a drum defining a longitudinal axis and having axially opposed first and second end portions that are rotatable relative to one another about the longitudinal axis; and
a shape memory element wrapped around the drum and around the longitudinal axis and extending from the first end portion of the drum to the second end portion of the drum to actuate relative rotation of the first and second end portions of the drum about the longitudinal axis by activation of the shape memory element;
wherein the drum includes a plurality of discs including at least three discs axially stacked along the longitudinal axis, the at least three discs being free to rotate independently from one another around the longitudinal axis.

US Pat. No. 9,556,858

ROTATIONAL ACTUATORS

Simmonds Precision Produc...

1. An actuator comprising:
a drum defining a longitudinal axis and having axially opposed first and second end portions that are rotatable relative to
one another about the longitudinal axis; and

a shape memory element wrapped around the drum and extending from the first end portion of the drum to the second end portion
of the drum to actuate relative rotation of the first and second end portions of the drum about the longitudinal axis by activation
of the shape memory element, wherein the first and second end portions of the drum are connected to one another by an annular
flexible drum portion with slots defined therethrough, wherein the slots are aligned in an oblique direction relative to the
longitudinal axis in a direction opposed to actuator rotation in a relaxed state.

US Pat. No. 9,984,841

WIRE RELEASE MECHANISM

Simmonds Precision Produc...

1. A wire release mechanism, comprising:a first component with a first base and a first finger longitudinally extending from the base;
a second component with a second base and a second finger longitudinally extending from the base, the second component being positioned adjacent to the first component such that the first finger is longitudinally alongside the second finger, and wherein relative longitudinal movement is permitted between the first finger and the second finger such that the second component is movable longitudinally relative to the first component between a first position and a second position; and
a wire that begins at the first base, is wound about the first and second fingers, and ends at the second base;
wherein the wire restrains the second component in the first position and includes a higher resistance fuse portion that selectively causes the wire to be loosened about the first and second fingers to allow the second component to move to the second position due to the flow of electrical current through the fuse portion of the wire.

US Pat. No. 10,196,152

SENSOR DATA PROCESSING FOR CONDITION MONITORING SYSTEMS

Simmonds Precision Produc...

1. A method of processing sensor data, the method comprising:obtaining, using a first sensing element of a first digital sensor, first sensor data;
obtaining, using a second sensing element, second sensor data;
obtaining, by the first digital sensor via a digital bus, received sensor data corresponding to the second sensor data;
processing, by a controller of the first digital sensor, the first sensor data and the received sensor data to generate processed data; and
providing the processed data, via the digital bus, to a host computer.

US Pat. No. 10,147,244

FAULT SOURCE PARAMETER IDENTIFICATION

Simmonds Precision Produc...

1. A method comprising:sensing a first set of parameters;
receiving a second set of parameters that does not include any of the first set of parameters;
generating a first air data value based on the first set of parameters;
processing the second set of parameters through an artificial intelligence network to generate a second air data value;
processing the second set of parameters through a plurality of diagnostic artificial intelligence networks to generate a plurality of diagnostic air data values, each of the plurality of diagnostic artificial intelligence networks excluding a different one of the second set of parameters; and
identifying, based on the first air data value and the plurality of diagnostic air data values, one of the second set of parameters as a fault source parameter that is associated with a fault condition.

US Pat. No. 9,945,695

PROXIMITY SENSOR

Simmonds Precision Produc...

1. A proximity sensor comprising:an active sensor comprising an active electrical resonant tank circuit that includes an excitation source, a first capacitor, and a first inductor;
a passive target comprising a passive electrical resonant tank circuit that includes a second capacitor and a second inductor, wherein magnetic coupling between the first inductor and the second inductor varies as a function of separation distance between the first inductor and the second inductor in parallel with the second capacitor; and
a measurement circuit configured to measure an analog value of the coupled resonant frequency response in the active electrical resonant tank circuit and provide a measured distance output based on the analog value of the coupled resonant frequency response, wherein the analog value of the coupled resonant frequency response varies as a function of the separation distance;
wherein the active electrical resonant tank circuit has a quality factor Q1 greater than one and the passive electrical resonant tank circuit has a quality factor Q2 greater than one; and
wherein the measured distance output is a signal that represents the separation distance.

US Pat. No. 10,334,522

BATTERY USE MANAGEMENT FOR WIRELESS NETWORKS

Simmonds Precision Produc...

1. A wireless sensor network of an aircraft comprising:a plurality of wireless sensors that sense at least one parameter and transmit sensor signals representative of the at least one parameter sensed, each of the plurality of wireless sensors including a battery that provides power thereto, the plurality of wireless sensors comprising:
a first wireless sensor group configured to transmit sensor signals at a first transmission rate, the first wireless sensor group including a first wireless sensor configured to sense a first parameter of a first region of the aircraft; and
a second wireless sensor group configured to transmit sensor signals at a second transmission rate, the second wireless sensor group including a second wireless sensor configured to sense the first parameter of the first region of the aircraft, the second wireless sensor redundant with the first wireless sensor; and
a wireless data concentrator that receives the sensor signals, maintains a transmission schedule of the plurality of wireless sensors, initializes the first transmission rate to be faster than the second transmission rate, and adjusts the first and/or second transmission rates based on a change in operating status of the first wireless sensor.

US Pat. No. 10,228,399

CONFIGURABLE SMART SENSOR SYSTEMS

Simmonds Precision Produc...

1. A smart sensor system, comprising:one or more configurable input and output channels, each configurable channel including:
one or more first switches configured to activate the input and/or output and/or to select a type of input and/or output signal;
one or more second switches connected to each first switch and configured to configured to select between a high impedance path and a low impedance path to control the input and/or output configurable channel impedance;
at least one analog-to-digital converter and at least one digital-to-analog converter operatively connected to the one or more switches for the one or more configurable channels; and
at least one controller configured to control the configurable channels.

US Pat. No. 10,044,410

ROTORCRAFT TAIL BOOM HEALTH MANAGEMENT SYSTEM

Simmonds Precision Produc...

1. A system for data transfer in a rotorcraft comprising:a power bus extending from a power source in a main fuselage of the rotorcraft to provide electrical power to electrical loads located in a tail boom section of the rotorcraft;
a first power line communication node on the power bus in the tail boom of the rotorcraft;
a second power line communication node on the power bus in the main fuselage of the rotorcraft;
a digital sensor bus connected to the first power line communication node; and
a health and usage management system connected to the second power line communication node;
wherein information from the digital sensor bus is transmitted to the first power line communication node and across the power bus to the second power line communication node, and information is transmitted from the second power line communication node to the health and usage management system.

US Pat. No. 10,553,123

DETERMINATION OF COLLISION RISKS BETWEEN A TAXIING AIRCRAFT AND OBJECTS EXTERNAL TO THE TAXIING AIRCRAFT

Simmonds Precision Produc...

1. A method for determining collision risk between a taxiing aircraft and an object external to the taxiing aircraft, the method comprising:collecting position, heading, and/or ground-speed data of the taxiing aircraft;
predicting, based on the collected position, heading, and/or ground-speed data, a future position of the taxiing aircraft within a time interval;
tracking a location of the object external to the taxiing aircraft;
predicting, based on the tracked location, a future location of the object external to the taxiing aircraft within the time interval;
determining, based on the predicted future location of the object and the future position of the taxiing aircraft within the time interval, a measure of collision risk;
forming image data of a view of an area external to and including the taxiing aircraft;
mapping into the image data symbols indicative of the object external to the aircraft at the tracked location; and
annotating the image data with velocity vectors associated with object external to the aircraft.

US Pat. No. 10,424,076

IMAGING SYSTEM FOR FUEL TANK ANALYSIS

Simmonds Precision Produc...

1. A method comprising:generating reference image data representing a field of view of an interior of a fuel tank;
generating active image data representing the field of view of the interior of the fuel tank when the fuel tank contains fuel;
identifying, by a processing device based on the reference image data, physical features of the interior of the fuel tank;
comparing, by the processing device, the reference image data and the active image data to identify a location of the interior of the fuel tank corresponding to an interface of fuel and ullage within the interior of the fuel tank;
identifying, by the processing device, a location of the interior of the fuel tank corresponding to an intersection of the interface of fuel and ullage and one or more of the physical features of the interior of the fuel tank;
producing, by the processing device, a fuel measurement value representing an amount of fuel contained in the fuel tank based on the intersection of the interface of fuel and ullage with the one or more physical features of the interior of the fuel tank identified using the reference image data and the active image data; and
outputting, by the processing device, an indication of the fuel measurement value.

US Pat. No. 10,256,731

HIGH-EFFICIENCY HOLDUP CIRCUIT FOR SWITCH-MODE POWER SUPPLY

Simmonds Precision Produc...

1. A power supply comprising:a source steering diode configured to unidirectionally conduct DC electrical energy received from a source to a bulk capacitor where the conducted DC electrical energy is stored at a first voltage differential across the bulk capacitor;
a transformer having a source winding, a load winding, and a holdup winding, the load winding configured to provide electrical power to a load connected thereto;
a switching regulator configured to provide, in response to a signal indicative of the electrical power provided to the load, switched current to the source winding of the transformer, the switched current drawn from the bulk capacitor;
a holdup circuit coupled to the holdup winding of the transformer, the holdup circuit configured to store DC electrical energy on a holdup capacitor, the DC electrical energy stored at a second voltage differential across the holdup capacitor, the second voltage differential greater than the first voltage differential;
a switching circuit configured to selectively transfer, in response to the first voltage differential falling below a predetermined threshold, the DC electrical energy stored on the holdup capacitor to the bulk capacitor; and
a one-shot configured to define a time period during which the DC electrical energy stored on the holdup capacitor is selectively transferred to the bulk capacitor.

US Pat. No. 10,436,059

ROTATING STALL DETECTION THROUGH RATIOMETRIC MEASURE OF THE SUB-SYNCHRONOUS BAND SPECTRUM

SIMMONDS PRECISION PRODUC...

1. A method comprising:calculating, by a computer based system configured to detect rotating stall in an engine, a power spectrum density (PSD) from data collected for a signal in the time domain;
determining, by the computer based system, a synchronous frequency component from at least one of the signal or an external signal source, wherein the external signal source comprises an optical tachometer configured to obtain real-time shaft speed;
identifying, by the computer based system, a frequency band from the calculated PSD and the determined synchronous frequency component as a sub-synchronous spectrum band;
calculating, by the computer based system, a quadratic function approximation coefficient to the identified frequency band in the identified sub-synchronous spectrum band;
setting, by the computer based system, a calculated quadratic function approximation coefficient to zero if at least one of the calculated quadratic function approximation coefficient is a positive number and the peak of the calculated quadratic function approximation is located outside the identified sub-synchronous spectrum band; and
analyzing, by the computer based system, the quadratic function approximation coefficient as an indicator of rotating stall for at least one of a baseline and detection.

US Pat. No. 10,442,548

INTERACTIVE ANALYSIS OF STRUCTURAL HEALTH DATA

Simmonds Precision Produc...

1. A method of compiling and interacting with data for a structural health monitoring system, the method comprising:obtaining, by a plurality of structural health monitoring (SHM) sensors, structural data regarding a plurality of zones of a plurality of structures of a vehicle;
transmitting the structural data from the vehicle to a computer system that includes a display and a user interface;
grouping, automatically by the computer system, the plurality of zones into a plurality of structural regions of the vehicle, and the plurality of structural regions into at least one structural area of the vehicle;
displaying, by the display, a visual representation of a structural region health of a first one of the plurality of structural regions based on the structural data for respective ones of the plurality of zones within the first one of the plurality of structural regions;
displaying, by the display, the visual representation of the structural region health of the first one of the plurality of structural regions based upon input from the user interface, wherein the input is a selection of the first one of the plurality of structural regions from the at least one structural area; and
displaying, by the display, a visual representation of a structural area health of the at least one structural area of the vehicle based on the structural region health of each of the plurality of structural regions of the at least one structural area;
wherein displaying, by the display, the visual representation of the structural region health further comprises displaying a visual representation of the respective ones of the plurality of zones as complex shapes indicative of an actual physical shape of the respective ones of the plurality of zones.

US Pat. No. 10,435,005

ELECTRO-MECHANICAL BRAKING MONITORING SYSTEMS AND METHODS

Simmonds Precision Produc...

1. A brake monitoring and adjustment control system, comprising:an electromechanical brake actuator controller (EBAC);
at least one sensor operatively connected to the EBAC for sensing a characteristic of at least one of a brake, or an electromechanical brake actuator (EBA) and providing a feedback signal to the EBAC; and
a switch for turning power to the sensor on and off at a frequency based on an expected re-adjustment frequency to reduce the duration with voltage applied to the sensor, wherein the expected re-adjustment frequency is based on worst-case thermal expansion data from a worn brake refuse-take-off (RTO) test.

US Pat. No. 10,427,665

FORCE FEEDBACK FAULT DETECTION AND ACCOMMODATION FOR A MULTI-CHANNEL ELECTRIC BRAKE ACTUATOR CONTROLLER

SIMMONDS PRECISION PRODUC...

1. A method of fault detection and accommodation for a controller and actuator system, wherein the actuator system includes an actuator and having a sensor and controls operation of an electric brake, the method comprising:generating and transmitting from the controller to the actuator a controller excitation current;
receiving at the controller a signal from the actuator system, the signal including a measured excitation current measured by the sensor;
setting a flag in the controller in response to the measured excitation current falling below a threshold value;
transmitting a flag signal after the flag is set, the flag signal being transmitted from the controller to control circuitry on the actuator;
receiving from the electric brake at the control circuitry on the actuator a first and second load cell signals that are based on a braking force applied by the electric brake;
determining at the control circuitry on the actuator how the actuator is operating the electric brake based on the first and second load signals wherein determining includes comparing the first and second load cell signals to expected first and second load cell signals;
adjusting a state of the actuator based on determining how the actuator is operating and transmitting the state to the controller;
adjust a state of the actuator in the controller based on the determination, wherein adjusting the state includes calculating a gain correction to be applied to the controller excitation current to reduce a force error of the actuator; and
operating the controller with the corrected gain.

US Pat. No. 10,308,347

WING TIP AILERON ACTUATION SYSTEM

Simmonds Precision Produc...

1. A flight vehicle comprising:first and second wings configured to be contained within a housing when in a stowed position and extend outward from the housing when in a deployed position;
an actuator;
a bell crank having a first end connected to the actuator, a pivot point at a second end, and first and second arms extending outward from the second end with the first arm having a first fork and the second arm having a second fork;
a first pivot pin rotatable with the first wing between the stowed position and the deployed position, the first pivot pin having an opening that is aligned with and adjacent to the first fork;
a first lever pin within the opening in the first pivot pin and extending out from the opening in the first pivot pin to be located within the first fork on the first arm, the first lever pin rotatable with the first wing and the first pivot pin so that the first lever pin is disengaged from the first fork when in the stowed position and is engaged with the first fork when in the deployed position;
a first wing tip shaft within the first wing and connected to the first lever pin at a first end and to a first aileron at a second end, the first wing tip shaft configured to rotate to control the first aileron when the first fork of the bell crank moves the first lever pin within the first pivot pin;
a second pivot pin rotatable with the second wing between the stowed position and the deployed position, the second pivot pin having an opening that is aligned with and adjacent to the second fork;
a second lever pin within the opening in the second pivot pin and extending out from the opening in the second pivot pin to be located within the second fork on the second arm, the second lever pin rotatable with the second wing and second pivot pin so that the second lever pin is disengaged from the second fork when in the stowed position and is engaged with the second fork when in the deployed position; and
a second wing tip shaft within the second wing and connected to the second lever pin at a first end and to a second aileron at a second end, the second wing tip shaft configured to rotate to control the second aileron when the second fork of the bell crank moves the second lever pin within the second pivot pin.

US Pat. No. 10,326,980

IMAGING SYSTEM FOR FUEL TANK ANALYSIS

Simmonds Precision Produc...

10. A system comprising:a light source;
a light sensor array;
at least one processor; and
a non-transitory computer-readable memory encoded with instructions that, when executed by the at least one processor, cause the system to:
illuminate an interior of a fuel tank with one or more light pulses emitted from the light source;
produce three-dimensional image data of the interior of the fuel tank based on reflected returns of the one or more light pulses received at the light sensor array;
identify, based on the three-dimensional image data, physical features of the interior of the fuel tank;
identify, based on the three-dimensional image data, a location of the interior of the fuel tank corresponding to an interface of fuel and ullage within the interior of the fuel tank;
identify, based on the three-dimensional image data, an orientation of the interface of fuel and ullage within the interior of the fuel tank;
produce a fuel measurement value representing an amount of fuel contained in the fuel tank based on the location of the interior of the fuel tank corresponding to the interface of fuel and ullage within the interior of the fuel tank, the orientation of the interface of fuel and ullage within the interior of the fuel tank, and the physical features of the interior of the fuel tank; and
output an indication of the fuel measurement value;
wherein the non-transitory computer-readable memory is further encoded with instructions that, when executed by the at least one processor, cause the system to produce the fuel measurement value based on the location of the interior of the fuel tank corresponding to the interface of fuel and ullage within the interior of the fuel tank by at least causing the system to:
determine, based on a model of a shape of the fuel tank, a volume of fuel contained within the fuel tank;
wherein the fuel tank is disposed within a wing of an aircraft;
wherein the non-transitory computer-readable memory is further encoded with instructions that, when executed by the at least one processor, cause the system to:
determine an amount of wing bending of the wing of the aircraft;
determine an adjusted shape of the fuel tank based on the determined amount of wing bending using a model of the shape of the fuel tank; and
produce the fuel measurement value by determining the volume of fuel within the fuel tank based on the adjusted shape of the fuel tank.

US Pat. No. 10,595,430

REGULATOR UNIT FOR DISTRIBUTED SENSOR SYSTEMS

Simmonds Precision Produc...

1. A power conditioning system comprising:a power source;
at least one node;
a host unit that includes a host mechanical housing and is configured to communicate with the at least one node; and
a voltage regulator unit comprising:
a first regulator mechanical housing mechanically mated with the host mechanical housing; and
a first voltage regulator circuit configured to condition the power from the power source and provide first conditioned power to the at least one node.

US Pat. No. 10,333,197

WIRELESS NETWORK WITH EQUIPMENT AREA NETWORK

Simmonds Precision Produc...

1. An equipment area network system of an aircraft comprising:equipment of the aircraft;
at least one wireless device proximate to the equipment, the wireless device configured to monitor the equipment of the aircraft and transmit and receive data over a first wireless link; and
at least one equipment area network coordinator communicatively coupled to the at least one wireless device via the first wireless link, the equipment area network coordinator comprising:
a first transceiver communicatively coupled to the at least one wireless device, the first transceiver configured to transmit and receive data using the first wireless link;
a second transceiver configured to transmit and receive data outside of the equipment area network using a second wireless link, the first wireless link using lower power than the second wireless link;
a first antenna electrically coupled to the first transceiver and communicatively coupled to the at least one wireless device; and
a second antenna electrically coupled to the second transceiver,
wherein the equipment, the at least one wireless device, and the first antenna are contained within an electromagnetically shielded enclosure.

US Pat. No. 10,281,329

METHOD AND SYSTEM FOR FAST DETERMINATION OF THE WAVELENGTH OF A LIGHT BEAM

Simmonds Precision Produc...

1. A system for determining a wavelength of a narrow-band light beam, the system comprising:a first photodetector having a first spectral response over a domain of wavelengths including the wavelength of the narrow-band light beam, the first photodetector configured to generate a first output signal id1 indicative of a first photocurrent induced by a projection of a first portion of the narrow-band light beam thereon, wherein the first spectral response is monotonically increasing throughout the domain of wavelengths including the wavelength of the narrow-band light beam;
a second photodetector having a second spectral response over the domain of wavelengths including the wavelength of the narrow-band light beam, the second spectral response different from the first spectral response, the second photodetector configured to generate a second output signal id2 indicative of a second photocurrent induced by a projection of a second portion of the narrow-band light beam thereon, wherein the second spectral response is monotonically decreasing throughout the domain of wavelengths including the wavelength of the narrow-band light beam; and
a calculation engine configured to determine a ratio of the first and second photocurrents, wherein the determined ratio is a monotonic function of wavelength over the domain of wavelengths including the wavelength of the narrow-band light beam, thereby indicative of the wavelength of the narrow-band light beam.

US Pat. No. 10,627,280

INTEGRATED SENSOR UNIT FOR FUEL GAUGING

Simmonds Precision Produc...

1. A system for estimating a quantity of fluid in a flexible composite container, the system comprising:a plurality of integrated sensor units, each of the sensor units comprising:
a pressure sensor configured to measure a pressure at a physical location of the sensor unit;
an acceleration sensor physically collocated with the pressure sensor and configured to measure at least three components of an acceleration vector at the physical location of the sensor unit; and
a temperature sensor physically collocated with the pressure sensor and the acceleration sensor and configured to measure a temperature at the physical location of the sensor unit;
a remote data concentrator; and
a processor configured to utilize a model of container geometry and a change in direction of the acceleration vector with respect to a local coordinate frame for each of the plurality of integrated sensor units to determine a degree of container bending;
wherein each of the sensor units is configured to provide an output signal comprising the pressure, acceleration, and temperature measurements to the remote data concentrator via a communication pathway.

US Pat. No. 10,598,537

SYSTEMS AND METHODS FOR LIQUID LEVEL DETECTION WITH OPTOELECTRONIC INTERFACED DUAL THERMISTOR BEAD SENSOR

Simmonds Precision Produc...

1. A liquid level detection system comprising:a dual thermistor bead level sensor configured to be at least partially disposed in a liquid storage vessel and exposed to liquid;
a first optoelectronic interface operatively connected to the dual thermistor bead level sensor, wherein the first optoelectronic interface includes a signal conditioning circuit connected to the dual thermistor bead level sensor to provide electrical power to the dual thermistor bead level sensor and to receive voltage readings therefrom;
a second optoelectronic interface operatively connected to the first optoelectronic interface; and
a fiber optic cable optically connecting the first optoelectronic interface to the second optoelectronic interface to provide photonic power to the first optoelectronic interface and to transmit data from the first optoelectronic interface to the second optoelectronic interface, wherein the signal conditioning circuit includes:
a first comparator circuit having a ramp voltage source input and a first actual thermistor bead voltage input, wherein the ramp voltage source input is independent from the dual thermistor bead level sensor, wherein the first comparator circuit is configured and adapted to compare a ramp voltage of the ramp voltage source input to a first actual thermistor bead voltage of a first thermistor bead of the dual thermistor bead level sensor during the measurement cycle,
a second comparator circuit having a ramp voltage source input and a second actual thermistor bead voltage input, wherein the ramp voltage source input is independent from the dual thermistor bead level sensor, wherein the second comparator circuit is configured and adapted to compare a ramp voltage of the ramp voltage source input to a second actual thermistor bead voltage of a second thermistor bead of the dual thermistor bead level sensor during the measurement cycle, and
a third comparator circuit having a ramp voltage source input and a reference voltage input, wherein the ramp voltage source input is independent from the dual thermistor bead level sensor, wherein the third comparator circuit is configured and adapted to compare a ramp voltage of the ramp voltage source input to a reference voltage of the reference voltage input during the measurement cycle.

US Pat. No. 10,484,895

WIRELESS DATA CONCENTRATOR SYSTEMS AND METHODS

Simmonds Precision Produc...

1. A vehicular wireless networking system, comprising:a first data concentrator configured to transmit a predetermined signal of predetermined characteristics according to a transmission setting;
at least one second data concentrator configured to listen for and/or receive a signal from the first data concentrator; and
a network analysis module operatively connected to the first data concentrator to at least modify a transmission setting thereof and to send a transmit command to the first data concentrator to cause the first data concentrator to send the predetermined signal, wherein the network analysis module is operatively connected to the second data concentrator at least to receive a received signal therefrom, the network analysis module configured to determine if there are any signal transmission effects between the first data concentrator and the second data concentrator based on a comparison of the predetermined signal and the received signal, wherein network analysis module is configured to receive an aircraft startup signal before transmitting a transmit command to cause a determination of any signal transmission effects with every aircraft startup.

US Pat. No. 10,317,275

VIBRATION MONITORING SYSTEMS

Simmonds Precision Produc...

1. A vibration monitoring system for determining an operational condition of a vibratory system, comprising:one or more sensors configured to output a vibration signal;
a preprocessing module operatively connected to the sensors to receive and preprocess the vibration signal, the preprocessing module configured to output a preprocessed signal;
a time processing module operatively connected to the preprocessing module to receive the preprocessed signal and to output time domain data;
a frequency processing module operatively connected to the preprocessing module to receive the preprocessed signal and to output a frequency domain data, wherein the frequency processing module processes the preprocessed signal in the frequency domain, wherein processing in the frequency domain includes determining a spectral bandwidth (SB) of the preprocessed signal, the spectral bandwidth is normalized and is determined by
wherein N is the number of sub-synchronous components to the spectral bandwidth, wherein the spectral bandwidth converges toward 1 as vibration signals approach random; anda data fusion module operatively connected to the time processing module and the frequency processing module to receive the time domain data and the frequency domain data, wherein the data fusion module is configured to combine the time domain data and frequency domain data to determine the operational condition of the vibratory system; and
an alarm configured to be operated when existence of an abnormal operational condition of the vibratory system is determined.

US Pat. No. 10,284,607

SELECTIVE BYPASSING OF DAISY-CHAINED NETWORK DEVICES

Simmonds Precision Produc...

1. A switching device for bypassing a daisy-chained network device from a wired network, the device comprising:a first network connector configured to connect to a first wired network port of the daisy-chained network device;
a second network connector configured to connect to a second wired network port of the daisy-chained network device;
a normally-closed switch having a first terminal, a second terminal and a pole, the first terminal electrically connected to the first network connector, the second terminal electrically connected to the second network connector, and the pole, when energized, opening the normally-closed switch such that the first and second terminals are electrically isolated from one another; and
a resettable timer having an input port and an output port, the input port configured to receive reset signals, the output port electrically coupled to the pole of the normally-closed switch, the resettable timer configured to generate an output signal on the output port that energizes the pole during a predetermined time period following every reset signal received and de-energizes the pole after the predetermined time period following a last of the received reset signals.

US Pat. No. 10,715,350

AUTOMATIC ADDRESSING OF NETWORKED NODES

Simmonds Precision Produc...

1. A method of addressing each of a plurality of nodes of a communication network, the method comprising:powering, by a power bus, a first node of the plurality of nodes;
starting, by the first node, a first timer upon a detection of power of the first node;
connecting, by the first node, the power bus to a second node of the plurality of nodes, in response to the first timer reaching a first threshold;
providing, from a host controller, a first address to the first node of the plurality of nodes over a communication bus, to which each of the plurality of nodes is directly and electrically connected, wherein the communication bus is separate from the power bus;
starting, by the host controller, a host timer upon provision of the first address;
providing, from the host controller, a second address to the second node of the plurality of nodes over the communication bus, in response to the host timer reaching a second threshold;
receiving, by the first node, the first address provided by the host controller;
providing, by the first node, a first address acknowledgement to the host controller, the first address acknowledgement indicative of successful receipt of the first address by the first node; and
connecting, by the first node, the power bus to the second node of the plurality of nodes, both in response to the first address being successfully received by the first node.

US Pat. No. 10,641,645

INTEGRAL FLUID MEASUREMENT SYSTEM

Simmonds Precision Produc...

1. A hybrid interface unit for communicating with one or more sensors disposed in a fluid tank, the hybrid interface unit comprising:a hybrid interface, the hybrid interface configured to communicate with a first sensor disposed in the fluid tank using a first communication technology, and with a second sensor disposed in the fluid tank using a second communication technology different from the first communication technology;
a data bus interface; and
a digital signal processor, the digital signal processor configured to exchange data between the hybrid interface and the data bus interface.

US Pat. No. 10,571,438

STRUCTURAL HEALTH MONITORING AND BASELINE DEVIATION ASSESSMENT

Simmonds Precision Produc...

1. A method comprising:performing at least one baseline structural interrogation of a physical structure in one or more corresponding baseline conditions of the structure;
storing, by a controller, the one or more baseline conditions of the structure corresponding to the at least one baseline structural interrogation;
sensing, using at least one sensor, one or more current conditions of the structure;
determining, by the controller, whether a difference between the one or more current conditions and the one or more baseline conditions satisfies at least one threshold deviation criterion, wherein the at least one threshold deviation criterion includes a maximum deviation between the one or more baseline conditions of the structure and the one or more current conditions of the structure;
outputting, by the controller, either an indication that the at least one threshold deviation criterion is not satisfied in response to determining that the difference between the one or more current conditions and the one or more baseline conditions does not satisfy the at least one threshold deviation criterion or an indication that the at least one threshold deviation criterion is satisfied in response to determining that the difference between the one or more current conditions and the one or more baseline conditions does satisfy the at least one threshold deviation criterion;
performing a current structural interrogation of the structure in response to determining that the difference between the one or more current conditions and the one or more baseline conditions satisfies the at least one threshold deviation criterion;
storing, by the controller, a result of each of the at least one baseline structural interrogation of the structure; and
comparing a result of the current structural interrogation to the result of one of the at least one baseline structural interrogation of the structure to identify the presence of structural damage of the structure.

US Pat. No. 10,518,872

CONTINUOUS FUEL TANK LEVEL CONTROL

SIMMONDS PRECISION PRODUC...

1. A method of fuel distribution in an aircraft comprising:selecting a desired longitudinal center of gravity of an aircraft;
determining a predicted rate of change of the center of gravity location during flight operation of the aircraft;
disposing a volume of fuel in a tail fin tank of a vertical tail fin of the aircraft;
transferring the fuel from the tail fin tank forward along a longitudinal axis of the aircraft at a predetermined transfer rate to counteract the predicted rate of change of the center of gravity location thereby maintaining the center of gravity in the selected position;
opening a fuel shut off valve fluidly connected to the tail fin tank and one or more tail plane tanks disposed at horizontal tail planes of the aircraft;
transferring fuel from the one or more tail plane tanks to the tail fin tank;
closing the fuel shut off valve; and
transferring the fuel from the tail fin tank forward along the longitudinal axis at the predetermined rate.

US Pat. No. 10,401,316

ACOUSTIC EVENT MONITORING FOR TRIGGERING OF HEALTH SCAN OF A STRUCTURE

Simmonds Precision Produc...

1. A system for monitoring an aircraft structure, the system comprising:an optical fiber network extending along an aircraft structure;
an optical emitter optically coupled to the optical fiber network and configured to generate an optical signal and to transmit the generated optical signal to the optical fiber network;
a series of optical acoustic transducers optically coupled to the optical fiber network and mechanically coupled to the aircraft structure at a series of acoustic sensor locations, each of the series of optical acoustic transducers configured to receive the generated optical signal, to generate an optical response signal indicative of a detected passive acoustic condition at a respective acoustic sensor location, and to transmit the generated optical response signal to the optical fiber network;
an optical detector optically coupled to the optical fiber network and configured to receive the transmitted optical response signals generated by the series of optical acoustic transducers; and
a controller configured to generate a trigger signal configured to trigger an active health monitor scan, if a triggering one of the received optical response signals is indicative of a triggering acoustic event, the controller further configured to determine, based on a relative timing of the triggering one of the received optical response signals, a specific one of the acoustic sensor locations associated with a specific one of the series of optical acoustic transducers that generated the triggering one of the optical response signals associated with the generated trigger signal.

US Pat. No. 10,402,236

EVENT-BASED DATA COLLECTION FOR SMART SENSORS ON AN ARBITRATING BUS

Simmonds Precision Produc...

1. A method of collecting data in a system that includes a plurality of sensing nodes connected via an arbitrating data bus, the method comprising:entering, by the plurality of sensing nodes, an event monitoring mode, wherein each of the plurality of sensing nodes digitize and monitor first sensed data during a listening mode of the event monitoring mode;
detecting, by a first one of the plurality of sensing nodes, a detected event based upon the first sensed data;
outputting, by the first one of the plurality of sensing nodes, a first event message on the arbitrating data bus;
detecting, by second ones of the plurality of sensing nodes, the first event message on the arbitrating data bus;
recording, by the first one and the second ones of the plurality of sensing nodes, second sensed data as first event data based upon the first event message during a first event collection mode of the event monitoring mode;
monitoring, by a host node, the arbitrating data bus for the first event message;
exiting, by the plurality of sensing nodes, the event monitoring mode following completion of the first event collection mode; and
obtaining, by the host node, the first and second sensed data from the plurality of sensing nodes based upon receipt of the first event message.

US Pat. No. 10,379,133

SPEED ESTIMATION SYSTEMS

Simmonds Precision Produc...

1. A method for estimating rotational speed of a system, comprising:receiving vibrational data from a sensor;
estimating a speed from the vibrational data to create estimated speed data; and
filtering the estimated speed data through an adaptively weighted filter to minimize incorrect speed estimation, wherein filtering the estimated speed data through the adaptively weighted filter includes filtering the estimated speed data through a Kalman filter having an adaptive weight,
wherein filtering the estimated speed data through the Kalman filter having an adaptive weight includes:
filtering the estimated speed data through the Kalman filter which includes a Kalman gain Kk, wherein

wherein P? is an a priori prediction error covariance, R is a covariance matrix of measurement noises, and w is the adaptive weight; and
using a test statistic to measure the deviation of current estimation from previous estimations to enforce continuity in time domain, wherein using the test statistic includes determining errors between speed estimation and at least one of a speed prediction, a standard score, or a Mahalanobis distance to determine an estimation correctness and to modify the adaptive weight w if incorrect estimation is determined.

US Pat. No. 10,317,276

SYSTEMS AND METHODS FOR MONITORING SURGE CONDITIONS

Simmonds Precision Produc...

1. A method for monitoring for a turbomachine for a surge condition, comprising:detecting a surge condition through vibration signals measured at at least one location in a turbomachine, wherein detecting a surge condition includes:
determining a ratio-metric indicator, RBR, by comparing a blade frequency band, ?B, to a reference frequency band, ?R, wherein determining the ratio-metric indicator RBR includes:
determining a time window length for vibration data acquisition;
identifying the blade frequency band ?B and the reference frequency band ?R;
collecting vibration data with a known sampling rate with at least one accelerometer operable to generate the vibration signals representative of blade vibration and other vibration sources;
segmenting the vibration data into slices based on a time window;
determining a power spectrum of a given slice of vibration data;
obtaining respective residual spectrums from the power spectrum for the blade frequency band ?B and the reference frequency band ?R; and
calculating the ratio-metric indicator, RBR, for the given slice of vibration data by comparing the power spectrum of the blade frequency band ?B and the reference frequency band ?R with the following equation:

wherein S(?) is the Discrete Fourier Transform, DFT, for a frequency, ?, of the given slice of vibration data;
calculating a surge score, SS, with the following equation:

wherein R? is a sample mean of a set of ratio-metric indicators and R? is a sample standard deviation of a set of ratio-metric indicators;
determining whether a surge condition exists based on the surge score SS; and
altering operation of the turbomachine if a surge condition is determined.

US Pat. No. 10,623,379

METHOD AND APPARATUS FOR PHYSICAL LAYER SECURITY IN LOW POWER WIRELESS SENSOR NETWORKS

Simmonds Precision Produc...

1. A wireless communication system having physical layer security, the wireless communication system comprising:an antenna;
an RF a radio frequency (RF) preamplifier, the RF preamplifier having an input and an output, wherein the RF preamplifier receives as an input an RF signal from the antenna, the received RF signal having an electronic fingerprint that uniquely identifies a transmitting device, and whereby the RF preamplifier is configured to amplify the RF signal from the antenna;
an analog finite impulse response filter, the analog finite impulse response filter having an input and an output, the analog finite impulse response filter comprising:
a first and a second analog delay device, each analog delay device having an input, an output, and a time delay, whereby the output of the first analog delay device is the input to the second analog delay device;
a first and a second variable gain amplifier, each variable gain amplifier having an input, an output, and a gain, whereby the input to the first variable gain amplifier is the output of the first analog delay device and the input to the second variable gain amplifier is the output of the second analog delay device, and wherein each variable gain amplifier is configured to amplify the signal received at its input; and
a summing amplifier, the summing amplifier having at least two inputs, an output, and a gain, whereby the output of each variable gain amplifier is an input to the summing amplifier, and wherein the summing amplifier is configured to sum the signals at the at least two inputs and to produce an amplified signal summation at the output;
a receive permissive switch, the receive permissive switch having an input and an output, wherein:
the receive permissive switch receives an input from the RF preamplifier, the input being an amplified version of the RF signal from the antenna; and
the receive permissive switch is configured to electrically connect the amplified version of the RF signal to either the analog finite impulse response filter or the RF receiver;
a digital storage circuit, configured to store the at least one digital representation of the electronic fingerprint of the received RF signal;
an RF receiver, configured to receive an amplified version of the RF signal from the antenna and to provide the amplified version of the RF signal to a wireless device; and
a decision logic circuit, configured to:
receive the amplified signal summation;
produce a digital representation of the electronic fingerprint of the received RF signal;
store the digital representation of the electronic fingerprint of the received RF signal in the digital storage circuit, when the system is in a learning mode;
compare the digital representation of the electronic fingerprint of the received RF signal to at least one electronic fingerprint stored in the digital storage circuit, when the system is in a recognition mode;
produce a positive indication of a match, when the comparing of the digital representation of the electronic fingerprint of the received RF signal meets a match requirement to the at least one electronic fingerprints stored in the digital storage circuit; and
command the receive permissive switch to route the amplified version of the RF signal to:
the RF receiver, after there is a positive indication of a match, or
the analog finite impulse response filter, if there is not a positive indication of a match, or after a triggering event occurs.

US Pat. No. 10,442,545

LIQUID MEASUREMENT SYSTEM FOR A TANK

Simmonds Precision Produc...

1. A liquid measurement system for determining a quantity of a liquid within a tank, the system comprising:a pressurized air supply;
a valve connected to the pressurized air supply, the valve configured to introduce a known mass of air into the tank;
a two-way vent in the tank configured to allow air to leave the tank continually during and after the introduction of the known mass of air to return an air pressure within the tank to an ambient air pressure;
a pressure sensor able to measure a change in air pressure within the tank resulting from the introduction of the known mass of air into the tank; and
a processor operatively connected to the valve and the pressure sensor, the processor able to determine the volume of the liquid within the tank from the change in air pressure within the tank, the known mass of air introduced into the tank, and a time from the introduction of air until the air pressure within the tank returns to ambient pressure.

US Pat. No. 10,608,840

AUTOMATIC ADDRESSING OF NETWORKED NODES

Simmonds Precision Produc...

1. A method of addressing a plurality of nodes for a communication network, the method comprising:detecting, by a first node of the plurality of nodes, connection to a host computer on the communication network;
starting, by the first node, a first timer upon the detection of connection to the host computer;
providing, from the host computer, a first address to the first node over the communication network;
connecting, by the first node, a first communication input to a first communication output if the first address is successfully received by the first node so as to enable the method to be performed in relation to downstream nodes;
stopping, by the first node, the first timer, if the first address is successfully received by the first node;
sending, by the first node, an acknowledgment of receipt of the first address over the communication network, if the first address is successfully received;
connecting, by the first node, the first communication input to the first communication output if the first timer reaches a first threshold so as to enable the method to be performed in relation to downstream nodes;
providing, from the host computer, a second address to a second node of the plurality of nodes on the communication network upon receipt of the acknowledgment from the first node; and
providing, from the host computer, the second address to the second node of the plurality of nodes if a second timer reaches a second threshold prior to receipt of the acknowledgment, wherein the second threshold is greater than or equal to the first threshold.

US Pat. No. 10,641,673

OPTICALLY POWERED REMOTELY INTERROGATED LIQUID GAUGING SYSTEM

Simmonds Precision Produc...

1. An optically powered pressure sensor for sensing pressure of a liquid in a tank comprising:a hermetically sealed housing with at least a portion of the housing having a diaphragm, the hermetically sealed housing forms at least a portion of a hermetically sealed wall of the tank;
at least one sensor within the hermetically sealed housing configured to sense the pressure of the liquid;
at least one optical emitter configured to transmit data corresponding to the sensed pressure; and
a photocell array configured to receive light and provide power to the at least one sensor and the at least one optical emitter.

US Pat. No. 10,641,590

WING DEPLOYMENT AND LOCK MECHANISM

Simmonds Precision Produc...

1. A wing deployment and lock mechanism comprising:a first wing configured to pivot about a first pivot pin at an inner end of the first wing with the first wing having a first groove in the inner end of the first wing;
a second wing configured to pivot about a second pivot pin at an inner end of the second wing with the second wing having a second groove in the inner end of the second wing;
a lock block adjacent to the inner end of the first wing and the inner end of the second wing, the lock block having a forward end an aft end, and a bottom side with the lock block comprising:
a resilient member adjacent the aft end;
a first deploy pin extending from the bottom side of the lock block and configured to be positioned within the first groove in the first wing when the first wing is in a stowed position and be positioned forward of the first groove of the first wing when the first wing is in a deployed position;
a second deploy pin extending from the bottom side of the lock block and configured to be positioned within the second groove in the second wing when the second wing is in a stowed position and be positioned forward of the second groove of the second wing when the second wing is in a deployed position; and
a wedge between the forward end and the aft end, the wedge configured to be aft of the first wing and the second wing when in the stowed position and to contact and lock the inner end of the first wing and the inner end of the second wing in place when in the deployed position.

US Pat. No. 10,671,558

DISTRIBUTED TIME SYNCHRONIZATION PROTOCOL FOR AN ASYNCHRONOUS COMMUNICATION SYSTEM

Simmonds Precision Produc...

1. A slave node of a plurality of slave nodes of a distributed acquisition system, the slave node comprising:a communication interface for interfacing between a control component and a bus, the bus being a communication bus coupled to a master node of the acquisition system and the other slave nodes of the plurality of nodes; and
the control component configured to:
acquire a configuration that provides a definition for a packet interval, wherein the packet interval definition provides an adequate timing margin to ensure that communication packets transmitted by the master node and the one or more slave nodes occur only at harmonics of the packet interval definition;
receive master communication packets from the master node via the bus;
determine a start time of at least one most recent master communication packet of the master communication packets received from the master node;
calculate a synchronization time based on the start time; and
start transmission of slave communication packets to the master node based on the synchronization time,
wherein the control component is further configured to determine whether the slave node has been granted ownership of the bus, wherein transmission of the slave communication packets is started only when the slave node is granted ownership,
wherein determining whether ownership of the bus has been granted to the slave node includes determining a limitation of access to the bus associated with the grant of ownership, and
wherein the control component is further configured to refrain from starting transmission of the slave communication packets when ownership of the bus is no longer granted due to the limitation of access.

US Pat. No. 10,642,053

SCANNED LINEAR ILLUMINATION OF DISTANT OBJECTS

Simmonds Precision Produc...

1. A system for projecting a linear beam of light on a distant object, the system comprising:a laser diode bar having one or more laser diodes distributed along a common transverse axis, each of the one or more of laser diodes configured to emit a beam of light in an emission direction orthogonal to the transverse axis, the emitted beam diverging at a first divergence angle in a fast-axis direction orthogonal to both the transverse axis and the emission direction, and diverging in a slow-axis direction at a second divergence angle less than the first divergence angle, the slow-axis direction parallel to the transverse axis;
a first cylindrical lens configured to collimate and/or focus, in a fast-axis direction, the beam of light emitted by each of the one or more laser diodes;
a second cylindrical lens configured to diverge, in a slow-axis direction, the beam of light emitted by each of the one or more of laser diodes such that the beams of light emitted by the one or more laser diodes overlap one another in the slow-axis direction; and
a scanner configured to controllably pivot the linear beam of light about a pivot axis parallel to the slow axis.

US Pat. No. 10,921,156

ROTARY ENCODER WITH ADDITIVE MANUFACTURING FEATURES

Simmonds Precision Produc...

1. A rotary encoder comprising:a planar magnetic encoder disc comprising a plurality of linear, areal, and/or other geometric magnetic features added to the planar encoder disc by additive manufacturing distributed over a surface of the encoder disc configured for attachment to an end of a rotatable shaft, wherein the linear, areal, and/or other geometric magnetic features are interrupted by blank spaces to provide additional information;
a cylindrical magnetic encoder feature comprising a plurality of linear, areal, and/or other geometric magnetic features added to a cylindrical encoder feature by additive manufacturing distributed over a surface of the encoder feature configured for attachment to an outer diameter surface of the rotatable shaft, wherein the linear, areal, and/or other geometric magnetic features are interrupted by blank spaces to provide additional information;
a first magnetic sensor positioned adjacent to the end of the rotatable shaft to detect magnetic signals from the magnetic features on the planar encoder disc; and
a second magnetic sensor positioned adjacent to the outer diameter surface of the rotatable shaft to detect magnetic signals from the magnetic features on the cylindrical encoding feature.

US Pat. No. 10,612,901

REAL-TIME COMPENSATION OF INERTIAL GYROSCOPES

Simmonds Precision Produc...

1. A real-time compensation system of a projectile comprising:at least one flight controller configured to rotate the projectile about an axis from a first orientation to a second orientation through an angle;
at least one imager device configured to capture a first image at the first orientation and a second image at the second orientation;
at least one gyroscope configured to sense a first angular rate of the projectile as the projectile rotates between the first orientation and the second orientation; and
at least one processor configured to detect a feature in the first image, determine a first rotation angle based upon relative positions of the feature in the first and second images, determine a second rotation angle based upon the angular rate sensed by the at least one gyroscope, and determine a gyroscope compensation parameter based upon the first and second rotation angle.

US Pat. No. 10,670,442

FUEL GAUGING SYSTEM AND IMPROVED METHODOLOGY FOR FUEL QUANTITY ESTIMATION

SIMMONDS PRECISION PRODUC...

1. A processor-implemented method comprising:determining, by a processor, an environment of a tank comprising a liquid,wherein the environment of the tank comprises a current effective attitude of the tank;determining a plurality of liquid gauging algorithms comprising a first liquid gauging algorithm, wherein the first liquid gauging algorithm in the plurality of liquid gauging algorithms is associated with a first attitude range in a set of attitude ranges;
selecting, by the processor, the first liquid gauging algorithms from the plurality of liquid gauging algorithms based on the current effective attitude of the tank being within the first attitude range;
receiving, by the processor, sensor data characterizing the liquid of the tank;
utilizing, by the processor, the sensor data and the first liquid gauging algorithms to determine a property of the liquid;
wherein at least one attitude range is the set of attitude ranges overlaps with another attitude range in the set of attitude ranges defining an range overlap region; and
wherein the processor executes a smoothed switching algorithm when the current effective attitude of the tank is within the range overlap region, wherein the smooth switching algorithm comprises two liquid gauging algorithms.

US Pat. No. 10,641,620

HIGH ACCURACY, LOW POWER SIGNAL CONDITIONER

Simmonds Precision Produc...

1. A method of obtaining a high accuracy value from at least one sensor using a conditioning circuit, the method comprising:providing, by a processor, a first signal to the at least one sensor and obtaining a first sensor response from the at least one sensor;
providing, by the processor, the first signal to a reference component and obtaining a first reference response from the reference component;
providing, by the processor, a second signal, greater than the first signal, to the at least one sensor and obtaining a second sensor response from the at least one sensor;
providing, by the processor, the second signal to the reference component and obtaining a second reference response from the reference component; and
determining, by the processor, the high accuracy value based on the first sensor response, the second sensor response, the first reference response and the second reference response.

US Pat. No. 10,670,443

WIRELESS LIQUID GAUGING SYSTEM

Simmonds Precision Produc...

1. A wireless pressure sensor for sensing pressure of a liquid in a tank comprising:a hermetically sealed housing with at least a portion of the housing having a diaphragm, the hermetically sealed housing forming at least a portion of a hermetically sealed wall of the tank;
at least one sensor within the hermetically sealed housing configured to sense the pressure of the liquid;
at least one photocell array configured to receive light and generate power from the light;
at least one communication device configured to transmit data corresponding to the sensed pressure using wireless radio frequency signals; and
at least one energy storage device configured to store power generated by the at least one photocell array and provide power to the at least one sensor and the at least one communication device.

US Pat. No. 10,768,072

DATA ACQUISITION SYSTEM FOR CONDITION-BASED MAINTENANCE

Simmonds Precision Produc...

1. A data acquisition system for monitoring one or more components of a machine having a plurality of separate components, the data acquisition system comprising:a plurality of separate sensor modules, each of the plurality of separate sensor modules being associated with a separate respective component of the plurality of separate components of the machine, each of the plurality of separate components of the machine having a useful life, and including:
a sensor, configured to:
detect a parameter of the separate respective component; and
to provide sensor data based on the detected parameter; and
an interface module coupled to the sensor and configured to:
receive the sensor data from the sensor; and
generate module output data based on the received sensor data, the module output data comprising a representation of a condition of the separate respective component based on the received sensor data;
a server; and
a data bus, configured to:
couple the plurality of separate sensor modules to the server; and
allow transmission of the module output data from each of the plurality of separate sensor modules to the server;
wherein the server is configured to provide a time estimate of remaining useful life of at least one of the separate respective components of the machine at various points throughout the useful life of the at least one of the separate respective components of the machine.

US Pat. No. 10,930,421

METHOD OF TUNING AN INDUCTANCE OF AN INDUCTIVE SENSOR

Simmonds Precision Produc...

1. A method of tuning an inductance of an inductive sensor, the method comprising:determining a desired inductance of the sensor;
achieving the desired inductance by:
partially filling a core body cavity with a first mixture, the first mixture comprising an epoxy material and a magnetic material; and
further filling the core body cavity with a second mixture different from the first mixture, the second mixture being situated proximate and distinct from the first mixture;
wherein the cavity has a fixed volume; and
wherein the first mixture fills a controlled portion of the fixed volume that is less than the fixed volume, the controlled portion controlling the inductance of the sensor.

US Pat. No. 10,877,489

IMAGING SEEKER FOR A SPIN-STABILIZED PROJECTILE

Simmonds Precision Produc...

1. An imaging seeker for a spin-stabilized projectile, the imaging seeker comprising:a forward-looking imager configured to obtain a time-sequence of images of a scene aligned along an optical axis of the forward-looking imager, wherein each of the time-sequence of images is obtained at a capture time and has an image-rotation angle corresponding to a spin angle of the projectile at the capture time;
an image processor configured, for each of the time-sequence of images, to identify a target captured therein, and to determine relative position of the identified target with respect to rotation-center pixel coordinates, the relative position including an image rotation angle;
a signal generator configured to generate, based at least in part on the determined relative position of the identified target with respect to the rotation-center pixel coordinates, a course-correction signal configured to cause the projectile to correct course toward the target; and
a controller configured to control, based on the image-rotation angle(s) of an earlier image(s) of the time sequence of images, the capture time corresponding to a later image of the time-sequence of images so as to control the image-rotation angle of the later image of the time sequence of images.

US Pat. No. 10,837,745

SHORT-EXPOSURE IMAGING-SEEKER FOR SPIN-STABILIZED PROJECTILES

Simmonds Precision Produc...

1. An imaging-seeker for a spin-stabilized projectile that spins about a longitudinal axis of the projectile, the imaging-seeker comprising:a forward-looking imager configured to capture a time-sequence of images of a scene, the imager capturing the time-sequence of images at a frame rate;
an image correlation component configured to:
compare respective current images of the time-sequence of images to a corresponding previous image of the time-sequence of images; and
determine a rotation angle between the current and previous images based on the comparison;
shutter control logic configured to:
control the frame rate of the imager based on the rotation angle; and
estimate spin rate of the projectile based on rotation angles determined for iterations of a control loop;
an image rotator configured to rotate the time-sequence of images using the rotation angle;
an image processor configured to acquire a target in images of the rotated time-sequence of images;
a de-blur component configured to minimize blur in at least a portion of the time-sequence images, wherein minimizing the blur uses the estimated spin rate, minimizing the blur is performed before providing the at least a portion of the time-sequence images to the image processor for acquiring the target and only until the target is acquired and when target acquisition is repeated, and minimizing the blur is performed one of before and after rotating the image by the image processor; and
a signal generator configured to generate target bearing angles to cause the projectile to correct its course toward the target using the target bearing angles.

US Pat. No. 10,822,114

SYSTEMS AND METHODS FOR STATUS REPORTING FOR AIRCRAFT

Simmonds Precision Produc...

1. An aircraft monitoring system comprising:a sensor operatively connected to at least a portion of an aircraft;
a memory configured to store instructions;
a processor disposed in communication with the memory and the sensor, wherein the processor, upon execution of the instructions is configured to:
display a graphical representation of the portion of the aircraft; and
display a monitoring controller, wherein the monitoring controller is associated with the portion of the aircraft
wherein displaying the monitoring controller includes displaying the monitoring controller in a respective position more proximate to a portion of a graphical representation that corresponds to a location on the aircraft's geometry associated with the monitoring controller than to other portions of the graphical representation, wherein displaying the monitoring controller includes displaying, a plurality of passive status indicators indicative of statuses of respective sub-functions and, simultaneously, an active progress indicator indicative of which of the sub-functions is in progress.

US Pat. No. 10,818,024

RANGING OBJECTS EXTERNAL TO AN AIRCRAFT USING MULTI-CAMERA TRIANGULATION

Simmonds Precision Produc...

1. A system for ranging an object in a scene external to a taxiing aircraft, the system comprising:a light projector configured to be mounted on the taxiing aircraft at a projector location and further configured to project spatially-patterned infrared light onto the scene, thereby illuminating a spatially-patterned portion of the scene including a spatially-patterned portion of the object in the scene;
first and second cameras configured to be mounted on the taxiing aircraft at first and second distinct camera locations, and further configured to simultaneously capture, when the spatially-patterned infrared light is projected onto the scene, first and second images of the scene from the first and second distinct camera locations, respectively, thereby focusing the spatially-patterned portion of the object onto pixel(s) having first pixel coordinates in the first image and onto pixel(s) having second pixel coordinates in the second image;
an image processor configured to identify first and second regions of the first and second images, onto which the spatially-patterned infrared light is focused, respectively, and further configured to correlate the identified first and second regions with one another so as to determine the first and second pixel coordinates corresponding to the spatially-patterned portion of the object; and
a range calculator configured to calculate range to the object using triangulation based on the determined first and second pixel-coordinates and the first and second distinct camera locations from which the first and second images are simultaneously captured.

US Pat. No. 10,812,251

DISTRIBUTED TIME SYNCHRONIZATION PROTOCOL FOR AN ASYNCHRONOUS COMMUNICATION SYSTEM

Simmonds Precision Produc...

1. A master node of a distributed acquisition system, the master node comprising:a communication interface for interfacing between a control component and a bus, the bus being a communication bus configured for two-way communication and coupled to one or more slave nodes distributed in the acquisition system; and
the control component configured to:
acquire a configuration that provides a definition for a packet interval, wherein the packet interval definition provides an adequate timing margin to ensure that communication packets transmitted by the master node and the one or more slave nodes occur only at harmonics of the packet interval definition, and wherein the packet interval definition is a maximum expected time between successive transmission start times of communication packets transmitted by the master node;
distribute a time reference packet of the communication packets based on the packet interval definition via the bus to all of the slave nodes of the distributed acquisition system; and
schedule transmission of communication packets transmitted by the master node via the bus to the one or more selected slave nodes based on the packet interval definition,
wherein the control component expects communication packets transmitted by the one or more slave nodes to be synchronized based on the packet interval definition.