Abstract: In accordance with at least one aspect of this disclosure, a system includes a rotor configured to rotate about a rotor axis within a pump housing. In embodiments, the rotor includes, a first end face configured to interface with a stationary port plate, a plurality of vane slots defined in the rotor arranged circumferentially about the rotor axis configured to accept a respective vane therein, and a plurality of lands between each vane slot, wherein each land includes a portion of the first end face. The rotor also includes, a lubrication pad defined in the first end face of at least one land between neighboring vane slots such that the lubrication pad is fed by the neighboring vane slots to induce buildup of a lubrication film between the first end face and the stationary port plate in the lubrication pad.

Abstract: An electric motor/generator includes a stator, a rotor with a plurality of magnets and a rotor frame arranged to support the plurality of magnets in an outer rotor configuration so that the plurality of magnets are arranged to form an annular ring surrounding the stator. The electric motor/generator also includes a banding sleeve disposed on a circumferential portion of the rotor frame radially outwardly of the plurality of magnets. The banding sleeve may comprise a composite material such as a carbon fibre composite.

Abstract: An airfoil, having: a body defining a leading edge and a trailing edge, wherein the body comprises: a base having an outer boundary extending longitudinally from a first end to a second end and transversely from a first side to a second side; and beads within the outer boundary, wherein each of the beads has a bead void, and wherein one or more of the beads includes: damping element within the bead void; or stiffening element extending across the bead.

Abstract: A system includes a permanent magnet generator (PMG) with a generator shaft defining a longitudinal axis. A brake system includes a brake shaft with a first end operatively connected to the generator shaft for selectively rotating with the generator shaft or braking to slow the generator shaft. A shear shaft is operatively connected to a second end of the brake shaft axially opposite the first end along the longitudinal axis. The brake system includes a wedge with a first position radially withdrawn from the brake shaft, and a second position radially pressed against the brake shaft for applying braking forces to the brake shaft and to the generator shaft.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. A bypass valve (BPV) includes a BPV inlet in fluid communication with the outlet line, and a BPV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. The BPV includes a thermostatic actuator configured to control recirculation flow amount through the BPV based on fluid temperature in the BPV. A method includes thermostatically controlling a bypass valve (BPV) to recirculate flow from the outlet line to an input line of the VDP in the event of flow demanded by the downstream system dropping below a predetermined low threshold of flow through the VDP based on fluid temperature in the BPV.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. A relief valve (RV) includes an RV inlet in fluid communication with the outlet line, and an RV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. An actuator is operatively connected to control the RV to change function of the RV between a first function and a second function. The first function is a high pressure relief valve function. The second function is as a wind milling bypass function. A controller is operatively connected to the actuator to control the RV to change back and forth between the first function and the second function.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism. A bypass valve (BPV) includes a BPV inlet in fluid communication with the outlet line, and a BPV outlet in fluid communication with a bypass line that feeds into the inlet line upstream of the VDP. An actuator is operatively connected to control the BPV to vary flow from the BPV inlet to the bypass line. An electromechanical actuator (EMA) is operatively connected to actuate the variable displacement mechanism. A temperature sensor is operatively connected to the outlet line to generate sensor output indicative of fluid temperature in the outlet line, wherein the temperature sensor is operatively connected to a controller for active control of the EMA and/or of the actuator based on temperature in the outlet line.

Abstract: A controllable pump system can include an inlet line and a pressure controlled pump connected to the inlet line to receive input flow. The pressure controlled pump can have a pressure controlled pump state configured to control a pump output to an output line connected to the pressure controlled pump. The system can include a slew pump connected to the inlet line and configured to output a slew pump pressure, and a slew pressure valve connected to the input line and to a second line and configured to output a control pressure to the pressure controlled pump. The second line can be configured to be in fluid communication with at least the slew pump such that the slew pressure valve can receive the slew pump pressure.

Abstract: A variable displacement pump can include a rotor having a plurality of vanes, and a cam ring surrounding the rotor and vanes. The vanes can be configured to extend from the rotor and contact an inner cam surface of the cam ring. The pump can also include one or more radial actuators configured to apply a radial force to the cam ring to control a position of the cam ring and the pumping action.

Abstract: A fluid pump system can include a controllable pump configured to generate a pump flow through the controllable pump and to output an output flow to an output line. The fluid pump system can include a flow split system configured to be in fluid communication with the controllable pump in a bypass state such that the flow split system is configured to divert a portion of the pump flow to maintain a desired output flow to the output line but to also allow the controllable pump to maintain a minimum pump flow through the controllable pump to maintain pump temperature below a high temperature threshold.

Abstract: A fuel system can include a main pump assembly having a main fuel pump connected to an input line and configured to pump fuel to a main fuel control via a main fuel control line, a recirculation pump connected to the input line, and a fuel recirculation system connected to the recirculation pump and upstream of the main fuel control. The fuel recirculation system can be configured to select a mode from a plurality of modes. The plurality of modes can include a recirculation mode and a backup mode. The fuel recirculation system can be configured to recirculate fuel from the recirculation pump to a tank through one or more coolers in the recirculation mode, and to provide fuel to the main fuel control in the backup mode.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. The VDP includes a variable stop configured to vary minimum displacement of the variable displacement mechanism based on position of the variable stop relative to a housing of the VDP. A pressure sensing valve (PSV) is operatively connected between the inlet line and the outlet line to actuate a stop member to adjust stopping position of the variable stop based on pressure differential between the inlet line and the outlet line.

Abstract: A system includes a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line. The VDP includes a variable displacement mechanism configured to vary pressure to the outlet line. An electromechanical actuator (EMA) is operatively connected to actuate the variable displacement mechanism. A flow sensing valve (FSV) connected in the outlet line. The FSV includes a sensor configured to generate sensor data indicative of flow out of the outlet line. A controller is operatively connected to the EMA to control the variable displacement mechanism based on the sensor data to support flow demands from one or more downstream systems.

Abstract: A reactor system may comprise a housing; and a condensation catalyst layer within the housing comprising a condensation catalyst comprised of at least one of a base-substituted zeolite, a stannous salt, or a phosphonitrile chloride. The condensation catalyst layer may be configured to catalyze a condensation reaction of a plurality of silane diols in water flowing through the housing into a plurality of siloxanes.

Abstract: A shock resistant body comprises a non-metallic lattice structure having a first region with a first foam density in a first region and a second foam density in a second region that is lower from the first foam density. The first region has solid lattice members of a larger cross-sectional area than those in the second region and the first region has smaller interstices between solid lattice members than those in the second region.

Abstract: A mechanical system for an aerospace application includes a drive input connected to a first axial end of a first diaphragm member, and a drive output connected to a second axial end of a second diaphragm member. The drive output is an aerospace component. The first and second diaphragm members are formed with two axial ends and at least one undulation extending radially of the axial ends. The at least one undulation is intermediate the ends. A tubular portion connects the first and second diaphragm members. The first and second diaphragm members and the tubular member are formed of fiber reinforced polymer matrix composites. The first and second diaphragm members are connected to axial ends of the tubular member by welding of the axial ends of the tubular portion to one of the inner ends of each of said first and second diaphragm members. The aerospace component is a propeller.

Abstract: A method for manufacturing a stator for an electric machine comprises manufacturing a slot cooling fin to extend into a slot defined between a first tooth, a second tooth, and a stator yoke, and disposing a coil in the slot, wherein the slot cooling fin extends into the first coil.

Abstract: A turbine of an air cycle machine, having: a housing; an output shaft that spins about a spin axis; a turbine disposed on the output shaft; a first nozzle defining a first inlet area that directs a first flow into the housing, the first nozzle extending along a first axis that is disposed at a first meridional angle to the spin axis; a second nozzle defining a second inlet area that differs from the first inlet area, the second nozzle directs a second flow into the housing to provide a mixed flow within the housing, the second nozzle extending along a second axis that is disposed at a second meridional angle to the spin axis, the second meridional angle differing from the first meridional angle; and a control valve configured to open and close the second nozzle.

Abstract: Examples described herein provide a method for testing a memory associated with a processing system of an aircraft. The method includes performing, during operation of the processing system, an operational built-in test on the memory. The method further includes, responsive to detecting an error in the memory during the operational built-in test, performing a focused memory test at a location in the memory of the error. The method further includes, responsive the error being confirmed by the focused memory test, causing the processing system to be taken offline.

Abstract: An electric machine assembly includes a rotor core. The rotor core includes a plurality of winding poles extending between a first axial face and a second axial face of the rotor core. A clench lock slot is defined in the first axial face. The clench lock slot includes a first channel section having a first channel width, a second channel section having a width equal to the first channel width, and a converging-diverging section connecting between the first channel section and the second channel section. A first end of the converging-diverging section connects to the first channel section and has a width equal to the first channel width. A second end of the converging-diverging section connects to the second channel section and has a width equal to the first channel width. A clench point of the converging-diverging section is defined where the converging-diverging section is narrowest.