Abstract: A heat exchanger includes a heat exchanger body having a first end and a second end opposed to the first end along a flow axis. A plurality of flow channels is defined in the heat exchanger body extending axially with respect to the flow axis. A first set of the flow channels forms a first flow circuit and a second set of the flow channels forms a second flow circuit that is in fluid isolation from the first flow circuit. Each flow channel is fluidly isolated from the other flow channels. The flow channels all conform to a curvilinear profile.

Abstract: In accordance with at least on aspect of this disclosure, a system, includes, a DC voltage input configured to provide AC voltage to a load, and a converter operatively connected between the voltage input and the load, configured to convert a DC voltage from the DC voltage input to the AC voltage. In embodiments, the converter can include a first inverter stage operatively connected between the voltage input and a diode bridge, for example, configured to connect one or more intermediate voltage levels to the load. The converter can include a second inverter stage operatively connected between the diode bridge and the load, and an interconnect switching module disposed at the second inverter stage operatively connected to control an output level of the converter at the load.

Abstract: There is provided herein an electrical motor and associated motor drive. The motor comprises an output shaft, and a speed sensor configured to measure the speed of the output shaft. The motor drive comprises a controller configured to output a current demand for the motor based on a speed error between a desired speed of the output shaft and the measured speed of the output shaft, and a feedback signal of the output current demand scaled by a first gain.

Abstract: A sensor system can include a sensor configured to output a sensor signal having a waveform output with noise and a peak detector module configured to receive the waveform output from the sensor and to detect a peak amplitude of the waveform output. The peak detector module can be configured to output a peak amplitude signal. The system can include a threshold module configured to receive the peak amplitude signal and to calculate a cutoff threshold based on the peak amplitude signal. The threshold module can be configured to output a cutoff threshold signal. The system can include a comparator operatively connected to the sensor and the threshold module. The comparator can be configured to receive the sensor signal and the cutoff threshold signal to compare the sensor signal and the cutoff signal.

Abstract: An electronic module assembly includes a circuit card assembly (CCA) including heat generating electronic components. A connector is electrically connected to the heat generating electronic components. The connector is positioned at a connection end of the CCA. A heatsink is mounted to the CCA and is connected in thermal communication with the electronic components. A wedge feature is defined along a lateral edge of the heatsink relative to the connector.

Abstract: An assembly includes a circuit card assembly (CCA) module including a CCA with heat generating electronic components and a connector electrically connected to the heat generating electronic components. A chassis including an electrical interface is included. The connector of the CCA module is electrically connected to the electrical interface. The chassis includes a removable cover. A heat transfer element is included between the cover of the chassis and an edge of the CCA module for heat sinking heat from the heat generating electronic components through the heat transfer element to the cover of the chassis.

Abstract: In accordance with at least one aspect of this disclosure, a system can include, a printed circuit board (PCB), a controller on the PCB configured to output a gate drive signal to one or more gate drivers 106 to drive a gate 108 of a switch (e.g., a transistor), and an isolation domain. The isolation domain can be defined in the PCB between the controller and the one or more gate drivers. More specifically, the isolation domain can begin at a first moat and end at a second moat, defined between the controller and the one or more gate drivers. The isolation domain can be configured to prevent common mode noise in the gate drive signal.

Abstract: In accordance with at least one aspect of this disclosure, a circuit can include a voltage input and a first inductor coil of a first channel configured to interface a second inductor coil of a second channel to induce voltage to a winding (e.g. a solenoid) via the first channel or the second channel. At least a first wraparound circuit of the first channel can be operatively connected to the first inductor coil to prevent interference from the second inductor coil from activating a wraparound circuit operatively connected to the first inductor coil.

Abstract: In accordance with at least one aspect of this disclosure, a system includes, a servo configured to control a position of a valve, a driver operatively connected to control movement of the servo, a control module operatively connected to control the driver, can configured to control the driver with pulse width modulated output to control a frequency of a generator through movement of the servo.

Abstract: An artificial intelligence and/or machine learning (AI/ML) system for an aircraft can include an AI/ML module configured to receive one or more inputs from one or more aircraft sensors and/or information systems. The AI/ML module can be configured to calculate an AI/ML informational output based on the one or more inputs. The AI/ML module can include a non-deterministic model for processing the inputs and outputting the AI/ML informational output.

Abstract: A method includes performing a test for transformer rectifier unit (TRU) backfeed protection by removing AC power supplied to the TRU but keeping the TRU contactor closed for a first predetermined span of time. The method includes observing the TRU for a second predetermined span of time. The method includes determining if the contactor opens during the second span of time, that a TRU backfeed protection is functional and passes the test, and determining if the contactor does not open during the second span of time, that the TRU backfeed protection has failed the test.

Abstract: In accordance with at least one aspect of this disclosure, a method for pulse width modulation control includes resolving a reference vector for any number of active space vectors to determine a voltage offset for the reference vector, adding the voltage offset to each active vector to determine a modified modulated signal to be added to a carrier signal, and controlling, with a control module, a switching circuit based at least in part on the modified carrier signal.

Abstract: A fuel system can include a selection and shutoff valve (SSOV) configured to allow a primary flow having a primary flow pressure to pass therethrough in a first state such that the primary flow can travel to an output line. The SSOV can also be configured to shut off the primary flow in a second state to prevent the primary flow from travelling to the output line. In the second state, the SSOV can be configured to allow a secondary flow from a secondary flow source to pass therethrough such that the secondary flow can travel to the output line.

Abstract: In accordance with at least one aspect of this disclosure, a flow control device can include, a first plate having one or more windows defining a flow path therethrough, a second plate configured to abut the first plate, and an actuator operatively connected to one or more of the first plate and/or the second plate. The actuator can be configured to drive the first plate and/or the second plate relative to one another to enlarge or reduce the flow path through the one or more windows in the first plate.

Abstract: In accordance with at least one aspect of this disclosure, a system can include, a moveable component configured to move between one or more positions, a biasing member operatively connected on a first side to bias the moveable component to a respective one of the one or more positions, and a preload member operatively connected to provide a force to a second side of the biasing member. An actuator can be operatively connected to move the preload member in response to a signal from a controller.

Abstract: In accordance with at least one aspect of this disclosure, a system for active flow control includes one or more flow control devices configured to control flow between a fluid source and a fluid destination, and a control module configured to control a flow area of each of the one or more flow control devices with fluid provided from the fluid source flowing to the fluid destination through the one or more flow control devices.

Abstract: A fuel system for a gas turbine engine includes an augmentor pump having an inlet communicating with a fuel supply source and a discharge communicating with an augmentation stage of the engine. An electric motor is operatively connected to drive the augmentor pump for selectively activating and deactivating the augmentor pump.

Abstract: In accordance with at least one aspect of this disclosure, a system can include a positive input line configured to connect between a voltage input and a load, and a negative input line configured to connect between the voltage input and the load. A logic module can be operatively connected to and/or configured to detect a fault (e.g., a short circuit) in either of the positive input line or the negative input line 104 between the voltage input and the load.

Abstract: A logic gate system for fault insertion testing can include a logic gate module having a plurality of input pins. The plurality of input pins can include an input signal pin configured to receive an input signal, a power supply input pin configured to receive power from a power supply, and a test input pin. The logic gate module can also include an output pin connected to the input pins via one or more logic gates. The logic gate system can include a power supply line connected to the power supply input pin and the test input pin. The logic gate system can also include a zero-ohm jumper resistor disposed between the power supply input pin and the test input pin. The zero-ohm resistor can be configured to be replaced with a low ohm resistor to allow reverse driving a voltage on the test input pin. The one or more logic gates can be configured to reverse an output at the output pin when the voltage on the test input pin is reverse driven.

Abstract: An electrical power converter (1, 1?, 1?) includes a DC link capacitor (3, 3?, 3?) configured for connection to a DC power source to provide an input load, at least one pair of semiconductor switches (2a, 2b, 2c, 2a?, 2b?, 2a?, 2b?) connected in parallel with the DC link capacitor (3, 3?, 3?) and positioned on either side of an output load terminal (10a, 10b, 10c, 10a?, 10b?, 10a?, 10b?). The electrical power converter (1, 1?, 1?) further includes an inductive current sensor (12, 12?, 12?), arranged to sense a primary current from a terminal of the DC link capacitor (3, 3?, 3?), and a detection circuit (14), connected to the inductive current sensor (12, 12?, 12?) and arranged to monitor for an over-current condition, and to produce an output which causes at least one of the pair of semiconductor switches (2a, 2b, 2c, 2a?, 2b?, 2a?, 2b?) to be switched to a non-conducting state when an over-current condition is detected.