Abstract: In accordance with at least one aspect of this disclosure, a system includes a fuel line, an electrically driven fuel pump configured to supply fuel to a first fuel line branch and a second fuel line branch, and a selector valve disposed in the fuel line at a juncture of a first fuel line branch and a second fuel line branch configured to communicate the electrically driven fuel pump with the first fuel line branch or the second fuel line branch based on a position of the selector valve. In a first position, the selector valve is configured to fluidly connect the electrically driven fuel pump with the first fuel line branch to supply fuel to a combustor of the engine and drive a high pressure shaft at a first speed. In a second position, the selector valve is configured to fluidly connect the electrically driven fuel pump with the second fuel line branch to drive a hydraulic rotation unit configured to drive the high pressure spool of the engine at a second speed different from the first speed.

Abstract: A system includes a main supply line and a thermal recirculation pump in fluid communication with the main supply line for supplying the thermal recirculation pump. The thermal recirculation pump is connected in fluid communication with a thermal recirculation line for providing fluid at an elevated pressure to the thermal recirculation line relative to the main supply line. A thermal recirculation control is connected in fluid communication to be supplied from the thermal recirculation line. A cooler system of one or more coolers is connected in fluid communication with a cooler supply line of the thermal recirculation control.

Abstract: A hydraulic actuator system of an aircraft includes a hydraulic actuator having a housing with a piston having a piston shaft with a piston head attached thereto and arranged within the housing. The piston head divides in internal volume of the housing into an extend cavity and a retract cavity and the extend cavity is configured to be connected to low pressure fluid source. The system also includes a pressure selector unit fluidly connected to the retract cavity and configured to be connected to the low pressure fluid source and to a high pressure fluid source. The unit include three solenoids with the first and second connected in parallel to the fluid sources and the third solenoid having a third solenoid first input connected to the first solenoid output, a third solenoid second input connected to the second solenoid output, and a third solenoid output connected to the retract cavity.

Abstract: An asynchronous communication system configured to operate a MIL-1553 protocol. The system includes: a bus; a bus controller coupled to the bus that is configured to control access to the bus; a remote terminal connected to the bus; a device controller connected to the remote terminal; and a read/write overlap avoidance latch connected to the remote terminal. The read/write overlap avoidance latch provides an active signal to the device controller that prevents the device controller from writing data to the remote terminal while the bus controller is reading data from the device controller during a read cycle.

Abstract: A method of DC-DC power conversion includes converting a DC link voltage to a DC output voltage for a load that is lower than the DC link voltage using a buck converter. The method includes controlling the buck converter in a normal switching mode in response to the DC link voltage being below a predetermined high threshold. The method also includes controlling the buck converter in a rate limited switching mode in response to the DC link voltage being at or above the predetermined high threshold.

Abstract: In accordance with at least one aspect of this disclosure, a system includes an airflow line, a main compressor disposed in the airflow line configured to receive a ram air flow and supply a compressed air flow to the air flow line, and a motor operatively connected to drive the main compressor. An air cycle machine is disposed in the airflow line downstream of the main compressor configured to receive the compressed airflow and supply a cooled cabin airflow to an aircraft cabin. A cooling line tap disposed in the airflow line downstream of the air cycle machine configured to communicate a flow of cooling air to the motor from the airflow line to supply a portion of the cooled cabin airflow to one or more portions of the motor as motor cooling air via a first cooling airflow line.

Abstract: A method of power switching includes receiving a command from an external aircraft controller to power an aircraft load from an aircraft voltage bus. The method includes in response to the command from the external aircraft controller, controlling a relay to connect or disconnect an aircraft voltage bus from an aircraft load. Controlling the relay includes current monitoring the relay and voltage monitoring the relay power switching. The method can include receiving temperature feedback indicative of temperature of the relay, and using the temperature feedback for at least one of controlling the relay and/or prognostic and health monitoring. The method can include outputting feedback to the external aircraft controller relating to status, operation, and health of the relay.

Abstract: A system includes a solid state power controller (SSPC) including a plurality of switching devices connected in parallel. A gate driver is operatively connected to control the plurality switching devices together so all of the switching devices in the plurality of switching devices either close to pass current through the SSPC, or open to prevent current passing through the SSPC in a normal operation mode. A fail open test circuit is operatively connected to individually control a respective gate of each of the switching devices in the plurality of switching devices for testing the plurality of switching devices individually for a fail OPEN condition.

Abstract: In accordance with at least one aspect of this disclosure, a rectifier assembly includes, at least, a first diode disposed between a first bus bar and a second bus bar. The rectifier assembly further includes, a first thermal management structure and a second thermal management structure. The first thermal management structure is configured to electrically connect the first bus bar to the first diode and be in thermal communication between the first bus bar and a first side of the first diode to transfer heat between the first bus bar and the first diode. The first thermal management structure is configured to transfer heat between the first bus bar and the first thermal management structure. The first thermal management structure is also configured to allow a fluid to flow therethrough to transfer heat from the first thermal management structure to the fluid flowing therethrough.

Abstract: A multi-functional beverage-making machine includes a housing, the housing defining a first serving station, a second serving station, and a control pad mounted on a front surface of the housing. The first serving station includes a first dispensing inlet, a first brew basket, a first dispensing outlet, and a first receptacle platform. The second serving station includes a second dispensing inlet, a second brew basket, a second dispensing outlet, and a second receptacle platform, wherein the second receptacle platform is separate from and positioned at least partially directly rearwardly of the first receptacle platform. The beverage-making machine further comprises: a water reservoir; a pump fluidly connected with the water reservoir; a heating unit; a three-way fluid diverting unit fluidly connected with the pump, the first dispensing inlet, and the second dispensing inlet; and a controller operatively connected with the control pad, the pump, the heating unit, and the three-way fluid diverting unit.

Abstract: A power distribution circuit includes a power input in electrical communication with a power input line, a switching circuit electrically connected to the power input line, and an overcurrent protection circuit electrically connected to the power input line. The overcurrent protection circuit includes a discrete silicon controlled rectifier (SCR) circuit, and a pulse qualifier configured and adapted to drive the discrete SCR circuit. A method for controlling a power distribution circuit includes detecting an ON status of at least a switching circuit. A semi-conductor control signal line connects the semi-conductor switch and the voltage command circuit. The method includes detecting an overcurrent status of the switching circuit with an overcurrent detection circuit. The method includes clamping voltage on the semi-conductor control signal line to cause the semi-conductor switch to be turned off.

Abstract: A mount according to an example of the present disclosure includes a locating pin, a load pin, a fastener, the fastener configured to retain a component on at least one of the locating pin and the load pin, the fastener including a bolt, a mounting boss and a spring, the spring allowing the mounting boss to move with respect to the bolt, and wherein the bolt is held captive in the mounting boss with a captive feature. A gas turbine engine and a method of mounting a component are also disclosed.

Abstract: A characterization system for automated ex vivo characterization of an esophageal catheter with a balloon probe for determining an esophageal pressure comprises an arrangement for filling the esophageal catheter with a measuring fluid before placing the esophageal catheter in an esophagus, a pressure sensor for detecting a pressure (peso) prevailing in the esophageal catheter; a device for determining at least one property that is characteristic of the esophageal catheter on the basis of the pressure (peso) detected in the esophageal catheter; a storage device for storing at least the property characteristic of the esophageal catheter; and at least one controller for controlling the characterization system, the controller being designed such that the characterization system performs a method comprising at least the following steps: filling the esophageal catheter with a measuring fluid ex vivo, in particular before placing the esophageal catheter in an esophagus; detecting a pressure prevailing in the esophag

Abstract: An actuator release mechanism includes: a longitudinal sleeve movable along an axis between a lock and release positions; drive means for causing the longitudinal sleeve to move along the axis; and bias means to bias the longitudinal sleeve to the lock position. The drive means includes: a rotary solenoid having a first direction of rotation and a second direction of rotation; a toggle member having a toggle shaft connected to and rotatable with the rotary solenoid, and a toggle head in engagement with the longitudinal sleeve by pins extending radially inwards from the longitudinal sleeve and a helical guide rail provided on a radially outer surface of the toggle head. The longitudinal sleeve is mounted around the toggle head, such that rotation of the solenoid causes rotation of the toggle member and the guide rails which causes the pin(s) to ride along the guide rail to rotate the sleeve.

Abstract: A field grading composite body includes a polymeric matrix and a particulate filler distributed within the polymeric matrix. Particles of the particulate filler include a core formed from a semiconductor material, an oxide mixed layer deposited on the core, and conducting oxide layer. The conducting oxide layer deposited on the oxide mixed layer to provide an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field composite body. Conductors and methods of making field grading composite bodies for conductors are also described.

Abstract: Aircraft engines include an engine housing, a core assembly arranged within the engine housing and comprising an engine shaft arranged axially within the engine housing extending in a forward-aftward direction, and a tail cone assembly attached to an aft end of the engine housing. The tail cone assembly includes a tail cone housing and an aircraft machine arranged within the tail cone housing the aircraft machine comprising a rotor shaft. An input shaft is configured between the engine shaft and the rotor shaft and a rotor coupling configured to sealing connect the rotor shaft and the input shaft, the rotor coupling configured to providing sealing engagement between the rotor shaft and the input shaft during at least one of relative axial displacement and relative radial displacement between the rotor shaft and the input shaft.

Abstract: The present disclosure provides for cooling systems, assemblies and methods (e.g., for semiconductor devices; for refrigerant cooling; for cryogenic cooling). More particularly, the present disclosure provides for mini-channel cold plate cooling assemblies, systems and methods for semiconductor devices (e.g., wide-bandgap (WBG) power semiconductor devices), with the cooling assemblies, systems and methods utilizing three-dimensional adaptive flow-paths using bi-metal fins. The present disclosure provides for mini-channel cold plate cooling assemblies, systems and methods that may improve cooling performance and/or enable local cooling control. The present disclosure provides for bi-metal strips that operate as both the surface-temperature sensors and actuators without input energy. The bi-metal strips guide the coolant flow to a low-drag channel when the surface temperature is low, and guide the coolant flow to the near-surface channel when the surface temperature is high.

Abstract: A seal plate for a rotary machine includes a hub centered on a central axis of the rotary machine, a disk portion extending radially outwards from the hub, and a variable lattice structure in an interior of the seal plate. The variable lattice structure includes a first region of the seal plate having a first lattice structure, and a second region of the seal plate having a second lattice structure. The second lattice structure of the second region is denser than the first lattice structure of the first region. The second region is a deflection region, a stress region, or an energy containment region of the seal plate.

Abstract: A phase change material heat sink including: a carbon graphite matrix having one or more removed portions; and an expanded graphite located within the one or more removed portions.

Abstract: A method of manufacturing an electric motor assembly includes inserting the pump motor stator into a vacuum chamber. The pump motor stator comprises a housing having a cavity formed therein and a pump motor stator located within the cavity. The pump motor stator contains an integral cooling tube located radially inward of the stator. The method also includes applying a vacuum to the pump motor stator in the vacuum chamber and flowing a potting material into a gap between the stator and the cooling tube and the stator, the gap extending a first distance longitudinally between the stator and the cooling tube. Pressure is applied to the potting material to push the potting material further into the gap.