Abstract: An environmental control system of a vehicle includes a first compression device including a compressor, a first turbine, and a power turbine operably coupled by a shaft. The first turbine is configured to receive a first medium, the compressor is configured to receive a second medium, and the power turbine is configured to receive a third medium. A second compression device, separate from the first compression device, includes a second turbine. The environmental control system is operable in a first mode and a second mode. In the first mode, the second medium is provided to the compressor and the second turbine sequentially. In the second mode, the second medium bypasses the second turbine. In in both the first mode and the second mode, only the second medium is provided to an outlet of the environmental control system.

Abstract: Disclosed is a method of making a part, comprising: forming the part via an additive manufacturing process, wherein the additive manufacturing process comprises layering, melting, and solidifying a metal alloy based on a three dimensional numerical model, wherein the formed part comprises a microstructure, wherein the microstructure comprises an average columnar grain length; and heat treating the formed part, wherein heat treating comprises heating to between 750° C. and 1200° C. for a time between 0.5 hours and 10 hours and then cooling the formed part below 750° C., wherein after heat treating, the formed part has an average columnar grain length of about 400 micrometers to about 1000 micrometers, as measured using electron backscattered diffraction.

Abstract: An electronic assembly includes a first printed wiring board (PWB) on a first side of the electronic assembly, and a first stiffener secured to the first PWB. The electronic assembly also includes a second PWB on a second side of the electronic assembly, opposite the first side, a second stiffener secured to the second PWB, and a center stiffener seated in the second stiffener and between the first stiffener and the second stiffener. The center stiffener has a first side facing the first stiffener, a second side that is opposite the first side and facing the second stiffener, a first end, and a second end, opposite the first end. Electronic devices are secured to the center stiffener. The center stiffener dissipates heat from the electronic devices, and the electronic devices include power dies.

Abstract: A shaft for a cabin air compressor includes a first attachment portion, a second attachment portion, an intermediate portion, a retention flange, and a tie rod support pocket. The first attachment portion is disposed at a first end of the shaft. The second attachment portion is disposed at a second end of the shaft opposite the first end. The intermediate portion extends from the first attachment portion to the second attachment portion and an interior wall of the intermediate portion defines an inner shaft space. The retention flange extends a first distance into the inner shaft space from the interior wall of the intermediate portion and is offset from the first attachment portion by a second distance. The tie rod support pocket is defined by the interior wall, extends between the flange and the first attachment portion, and is configured to receive a tie rod support.

Abstract: A magnetic pass-through controller of an in-helmet display includes internal components inside a helmet. The internal components include a magnet assembly holding one or more internal magnets and a swing arm affixed to the magnet assembly and affixed to the in-helmet display. External components outside the helmet include an external magnet housing holding one or more external magnets and an adjuster for manual rotation. The adjuster is coupled to the external magnet housing such that the manual rotation of the adjuster causes a corresponding rotation of the external magnet housing. Magnetic coupling between the one or more internal magnets and the one or more external magnets causes the corresponding rotation also in the magnet assembly and the swing arm.

Abstract: A method includes obtaining a base housing for electronic components. The base housing attenuates radiation entering the base housing by a base amount. An inner volume of the base housing defined by an inner surface of the base housing experiences attenuated radiation. The method also includes affixing one or more inserts to the inner surface of the base housing to further attenuate the attenuated radiation in corresponding one or more areas of the inner volume.

Abstract: A repaired turbine housing for use in an air cycle machine including a journal bearing bore having an inlet, an outlet, and an inner diameter of about 2.580±0.001 inches (6.553±0.003 centimeters). The repaired turbine housing including a cylindrical insert secured within the journal bearing bore. The cylindrical insert having a first end, a second end, an inner surface, a step located at the first end, and an outer surface with an outer diameter that provides a diametric interference with the inner diameter of the journal bearing bore. The diametric interference being between about 0.000-0.003 inches (0.000-0.008 centimeters). The cylindrical insert being inserted into the inlet of the journal bearing bore up to the step. The step has an outer diameter greater than the outer diameter of the cylindrical insert. The inner surface of the cylindrical insert includes at least one selected inner diameter.

Abstract: A generator shaft assembly including a primary shaft, a disconnect shaft housed within the primary shaft, where a first end of the disconnect shaft is configured to couple with the primary mover and a second end of the disconnect shaft is configured to mate with the generator. A retainer ring housed within the primary shaft having at least a landing and a groove on an inner surface thereof and a retainer member positioned between the landing of the retainer ring and an outer surface of the disconnect shaft configured to limit axial motion of the disconnect shaft relative to the primary shaft.

Abstract: An electrical power generation system including a micro-turbine alternator including a combustion chamber, at least one turbine driven by combustion gases from the combustion chamber, a first stage compressor, and a second stage compressor located aft of the first stage compressor. The first stage compressor and the second stage compressor being operably connected to the combustion chamber to provide a compressed airflow thereto. The micro-turbine alternator including one or more shafts connecting the at least one turbine to the first stage compressor and the second stage compressor such that rotation of the at least one turbine drives rotation of the first and second stage compressor. An electric generator is disposed along the one or more shafts such that electrical power is generated via rotation of the one or more shafts. The electric generator is disposed along the one or more shafts between the first and second stage compressors.

Abstract: A power supply system includes a direct current (DC) power source and a protection circuit having input and an input and an output, the input is operably coupled to the DC power so that, in operation, it receives DC power from the DC power source. The protection circuit includes a first path and a second path that both electrically couple the input to the output, and current passes, in operation, primarily through the first path when a voltage at the input is greater than a threshold voltage related to a Zener diode in the second path and primarily through the second path when the voltage at the input is below the threshold voltage. The system also includes a voltage regulator having an input coupled to the output of the protection circuit.

Abstract: An inlet header having: an inner end, an outer end, a plurality of segments therebetween, including: an outer segment that extends from the outer end to a first intermediate end, the outer segment defines a cylindrical profile; a first intermediate segment that forms an outer elbow and extends from the first intermediate end to a second intermediate end, the second intermediate end has a rectangular shape, and the first intermediate segment increases in width proportionally as it extends toward the second intermediate end; a second intermediate segment that extends from the second intermediate end to a third intermediate end, the third intermediate end has a rectangular shape, and the second intermediate segment increases in width and height proportionally as it extends toward the third intermediate end; and an inner segment that forms an inner elbow and extends from the third intermediate end to the inner end of the inlet header.

Abstract: A system includes a generator control unit (GCU). The GCU includes a saturable reactor and a rectifier. Each of the saturable reactor and the rectifier has a separate input to receive AC power from a separate respective permanent magnet generator (PMG). A method includes supplying AC power from a first permanent magnet generator (PMG) of a generator to a saturable reactor of a generator control unit (GCU) that is operatively connected to control the generator. The method includes supplying AC power from a second PMG to a rectifier of the GCU, wherein the first PMG supplies a lower AC voltage to the saturable reactor than the second PMG supplies to the rectifier.

Abstract: A system includes an injector having a scheduling valve assembly and a nozzle in fluid communication with the valve assembly. The scheduling valve assembly is configured for regulation of flow from an inlet of the injector to the nozzle. The injector includes two fluid circuits between the inlet of the injector and two respective outlets of the nozzle for staged flow output from the nozzle. A first one of the two fluid circuits is a primary circuit, and a second one of the two fluid circuits is a secondary circuit. A solenoid valve is connected in fluid communication with the scheduling valve assembly, wherein the solenoid valve is configured to adjust position of a hydromechanical valve spool of the valve assembly.

Abstract: A system includes an injector having a scheduling valve assembly and a nozzle in fluid communication with the valve assembly. The scheduling valve assembly is configured for regulation of flow from an inlet of the injector to the nozzle. The injector includes two fluid circuits between the inlet of the injector and two respective outlets of the nozzle for staged flow output from the nozzle. A first one of the two fluid circuits is a primary circuit, and a second one of the two fluid circuits is a secondary circuit. A solenoid valve is connected in fluid communication with the scheduling valve assembly, wherein the solenoid valve is configured to adjust position of a hydromechanical valve spool of the valve assembly.

Abstract: A system includes an injector having a scheduling valve assembly and a nozzle in fluid communication with the valve assembly. The scheduling valve assembly is configured for regulation of flow from an inlet of the injector to the nozzle. An electromagnetic device is operatively connected to a hydromechanical valve spool of the valve assembly to selectively adjust position of the valve spool in the valve assembly.

Abstract: In accordance with at least one aspect of this disclosure, a system includes, a first moveable member disposed in a first chamber configured to move between a first position and a second position of the first moveable member to allow or prevent fluid from passing from an inlet of the first chamber to an outlet of the first chamber. A second moveable member is disposed in a second chamber configured to move between a first position and a second position of the second moveable member to allow or prevent fluid from entering a biasing chamber, the second chamber being fluidly connected to the first chamber.

Abstract: A drive mechanism for an electric propulsion system that comprises an electric machine is disclosed. The drive mechanism comprises a drive shaft with a longitudinal axis A, an engagement means, and a disconnect mechanism. The engagement means comprises a drive shaft engagement element and an electric machine engagement element. The drive engagement element comprises a first and second shaft gear ring, and each shaft gear ring is supported on the drive shaft. Each shaft gear ring comprises a plurality of gear teeth which are circumferentially disposed around the drive shaft, and the gear teeth extend radially outward from the drive shaft.

Abstract: A system includes an injector including a scheduling valve assembly and a nozzle in fluid communication with the valve assembly. The scheduling valve assembly is configured for regulation of flow from an inlet of the injector to the nozzle. The injector includes one fluid circuit between the inlet of the injector and a respective outlet of the nozzle. A solenoid valve is connected in fluid communication with the scheduling valve assembly. The solenoid valve is configured to adjust position of a hydromechanical valve spool of the valve assembly.

Abstract: A fuel injector for a turbine engine includes a fuel scheduling valve configured for regulation of fuel flow from a fuel inlet, in response to fuel pressure received at the fuel inlet. Primary, secondary and auxiliary fuel circuits receive fuel from the scheduling valve, and an electrically-controlled valve is provided in fluid communication with the auxiliary circuit, which electrically-controlled valve is adapted and configured to actively control fuel through the auxiliary circuit in response to a control signal.

Abstract: A fuel injector for a turbine engine includes a fuel scheduling valve configured for regulation of fuel flow from a fuel inlet in response to fuel pressure received at the fuel inlet. Primary and secondary fuel circuits receive fuel from the scheduling valve, and an electrically-controlled valve is provided in fluid communication with the primary circuit, adapted and configured to actively control fuel through the primary circuit in response to a control signal.