Abstract: A vehicle includes a body, at least one propulsion system including an electric component, a strut extending between the body and the at least one propulsion system, and a cooling system operably coupled to the electric component of the at least one propulsion system. A portion of the cooling system is arranged within the strut.

Abstract: A system can include a bi-directional converter circuit comprising a plurality of switches and a flying capacitor configured to experience a low voltage or a high voltage, and a control module operatively connected to the plurality of switches to control a state of the plurality of switches. The control module can be configured to receive a sense signal indicative of a flying capacitor voltage and to control the one or more switches of the plurality of switches to charge or discharge the flying capacitor to maintain a target voltage or target voltage range.

Abstract: A heat exchanger core comprises a plurality of tubes extending along a first fluid axis, each of the plurality of tubes comprising a leading edge, a trailing edge opposite the leading edge, and a pair of oppositely disposed sidewalls extending from the leading edge to the trailing edge. The leading edge, trailing edge, and the pair of sidewalls define an inner surface and an outer surface of each of the plurality of tubes. Each of a first subset of the plurality of tubes further comprises a roughened region on the outer surface of one of the pair of sidewalls.

Abstract: The present disclosure relates to a winding for an electrical machine. The winding comprises at least one flat conductor having at least one turn to form the winding, and the at least one flat conductor comprises a substantially L-shaped, U-shaped or V-shaped cross-section. The present disclosure also relates to an electrical machine that includes the winding and an aircraft that includes the electrical machine.

Abstract: A filter includes a first edge structure forming a first ring about an axis. A second edge structure forms a second ring about the axis, axially spaced apart from the first ring along the axis. A filter medium extends from the first edge structure to the second edge structure. The first and second edge structures are configured to engage an internal surface of a main bore of a valve housing. The filter medium is configured to allow air flow through the filter medium from the main bore radially outward through the filter medium to filter particulate out of an airflow from the main bore passing radially outward through the filter medium.

Abstract: A system an analog to digital converter (ADC) operatively connected to receive an analog input signal from an input line and to output a digital input signal. A processor is operatively connected to receive the digital input signal from the ADC and to output a digital control signal for controlling a physical system based on the digital input signal. A digital to analog converter (DAC) is operatively connected to receive a copy of the digital input signal put out from the processor, and to output an analog output signal indicative of the copy of the digital input signal put out from the processor. Comparison logic is operatively connected to receive the analog input signal from the input line, to receive the analog output signal from the DAC, and to output an error signal in response to a mismatch between the analog input signal and the analog output signal.

Abstract: Embodiments relate to a digital image file alteration detection controller which implements a processor configuration to efficiently detect an alteration to a digital image file. The digital image file alteration detection controller can include a processor, and a memory associated with the processor, the memory including instructions stored thereon that when executed by the processor will cause the processor to: extract Photo Response Non-Uniformity (PRNU) data of a digital image file received from the memory; determine a local variability representing a variability in PRNU data for a locale of a digital image file; determine a global variability representing a variability in PRNU data for an entire digital image file; compare local variability to global variability; and generate an alteration detection indicator indicative of an alteration detected when the local variability to global variability comparison is less than a threshold value.

Abstract: Disclosed is a valve assembly, having: a valve duct having an upstream end, a downstream end and a duct wall extending from the upstream end to the downstream end; a first conduit extending from a first end at the valve duct to a second end spaced apart from the first end, the first conduit terminating at a valve assembly component; and a washing filter that includes filer media, wherein the filter media extends into the valve duct to remove particles and provide a clean flow to the first conduit.

Abstract: An air cycle machine includes a compressor in fluid communication with an output conduit, a first turbine operably connected to the compressor and fluidly coupling the compressor with the output conduit, a second turbine operably connected to the compressor and fluidly coupling the compressor with the output conduit, and a valve. The valve couples the compressor with the output conduit and has an open position and a closed position. In the open position the first turbine and the second turbine are fluidly connected in parallel between the compressor and the output conduit. In the closed position the first turbine is fluidly connected in series with the second turbine between the compressor and the output conduit. Air cycle machine systems and methods of controlling flow in air cycle machines are also described.

Abstract: A compensator circuit for a PWM active rectifier includes a look up table containing compensating voltage values for given values of input phase current and input voltage frequency, and a low pass filter arranged to filter the input phase current to the rectifier based on a filter bandwidth determined according to the input voltage frequency. The compensator circuit arranged to receive measured input current and voltage frequency values and to output corresponding compensation voltage values from the look up table, the compensation voltages to be provided, in use, to the rectifier to adjust the switching pattern of the rectifier.

Abstract: A fuel system a main manifold with an inlet and a plurality of main manifold branches. Each valve in a plurality of valves is connected in fluid communication with a respective one of the main manifold branches in the plurality of main manifold branches to receive flow from the main manifold. Each secondary manifold in a plurality of secondary manifolds connects a single one of the valves in the plurality of valves to a pair of secondary manifold branches. Each nozzle in a plurality of fuel nozzles includes a first inlet connected in fluid communication to one of the valves through one of the secondary manifold branches, and a second inlet connected in fluid communication to a different one of the valves through a different one of the secondary manifold branches so each of the fuel nozzles has a redundant connection to the main manifold through two of the valves.

Abstract: In accordance with at least one aspect of this disclosure, a system can include a main board, two or more redundant CPUs for any number of channels operatively connected to the main board and two or more power sources operatively connected to provide power to at least one or more of the two or more CPUs. A respective isolated communications block can be operatively connected to each of the two or more CPUs configured to provide external communications from other components on the main board to a respective CPU.

Abstract: A system can include a first controllable valve configured to output a control pressure on one or more first pressure control lines, a second controllable valve configured to output a control pressure on one or more second pressure control lines, a transfer valve in fluid communication with the first controllable valve and the second controllable valve, and a hydraulic centering system operatively associated with and/or forming part of the transfer valve. The transfer valve can be configured to move between a first position, a second position, and a third position. The hydraulic centering system can be configured to maintain the transfer valve in the first position.

Abstract: A circuit can include a closed loop bus line having a plurality of connections. The circuit can include a plurality of integrated circuits disposed on the close loop bus line at a respective connection of the plurality of connections. One or more of the integrated circuits can be configured to drive a signal on the closed loop bus line. The closed loop bus line can be configured to prevent signal reflection. For example, in certain embodiments, there are no termination resistors at any of the terminations to reduce size, weight, and/or part count of the circuit.

Abstract: An exemplary mobile apparatus for assessing an operating condition of an asset. The mobile device includes at least one sensor device for acquiring data related to one or more operational or environmental characteristics of an asset during operation. The mobile device further includes a processing device encoded with a neural network architecture having one or more models trained to identify one or more operating conditions of one or more assets according to asset type. The processing device can determine an operating condition of the asset by extracting features from the acquired data and comparing attributes of the extracted features to attributes of at least one known operating condition determined through training of the models. The mobile device can also include an output interface to output a result of the determination performed by the processing device, which can include communicating the result to a remote device.

Abstract: A power source selection system can include a primary source line configured to be connected to a primary source having a primary voltage, a backup source line configured to connect to a backup source having a backup voltage, and a voltage divider and limiter connected to the primary source line to receive the primary voltage and to provide an sense signal on a sense line. The system can include a NAND gate connected to the voltage divider and limiter to receive the sense signal. The NAND gate can be configured to provide a gate signal to a gate line based on the sense signal. The system can include a switchover circuit connected to the backup source line and the gate line to receive the backup voltage and the gate signal. The switchover circuit can be configured to output the backup voltage to a switch line in a first state, and to prevent backup voltage to the switch line in a second state.

Abstract: A foil journal bearing, having: a shaft; a top foil surrounding the shaft in a circumferential direction; a corrugated bump foil surrounding the top foil in the circumferential direction, wherein the corrugated bump foil includes a plurality of adjacent corrugations that each include sidewalls that extend from a radial inner end to a radial outer end of the corrugated bump foil; and a bearing sleeve surrounding the corrugated bump foil, wherein: at least one of the sidewalls of at least one of the corrugations includes an undulation disposed between the outer and inner radial ends of the sidewall; and the undulation is defined by an undulation outer end and an undulation inner end.

Abstract: A ratiometric temperature measurement system includes a sensing circuit to measure a temperature and a controller to determine a resistance corresponding to the sensing circuit. The sensing circuit includes a temperature sensing circuit and a current sensor. The sensing circuit utilize an electrical current to output a first voltage indicative of a first voltage differential across the temperature sensing circuit and to output a second voltage indicative of a second voltage differential across the current sensor. The controller is configured to determine a resistance corresponding to the temperature sensing circuit based at least in part on the first and second voltage differentials. The controller determines a temperature value indicative of the measured temperature based on the resistance.

Abstract: A flapper check valve includes a valve seat body. Two flapper valve portions are each mounted on their own shaft to the valve seat body, and pivotable between open and closed positions. The flapper valve portions pivot in a common rotational direction to the open position and to the closed position. A fluid systems is also disclosed.