Abstract: A pin for a heat exchanger. The pin includes: a monolithic top section; a monolithic bottom section; and a middle section comprising a plurality of spaced apart sub-pins extending between the top section and the bottom section, wherein the plurality of sub-pins define one or more windows for allowing fluid flow through the middle section. Also disclosed is a layer of a heat exchanger including the pin, as well as a heat exchanger including the layer, and a method of making a layer for a heat exchanger.

Abstract: A rotor assembly is provided and includes a two-piece rotor impeller and a rotor shaft. The two-piece rotor impeller includes a blade section and a forward section, which is connected to the blade section. The rotor shaft includes an aft section at which the rotor shaft terminates. The aft section is directly attached to the forward section of the rotor impeller. The blade section includes a converging blade configured to converge to a point with a minimized internal diameter (ID).

Abstract: A variable frequency starter generator (VFSG) system includes a VFSG having a start mode and a generate mode, a permanent magnet generator (PMG) and a main generator section and an exciter section. The system also includes a controller electrically connected to the VFSG. The controller flow start mode three phase electrical power from aircraft power to the exciter of the VFSG in the start mode and flows single phase electrical power to the exciter of the VFSG in the generate mode. The controller includes: an input active rectifier that receives input AC power and converts it to DC power and provides it to across a positive rail and negative rail; an output inverter coupled to an output of the input active rectifier; and one or more line inductors connected along one or both of the positive rail and negative rail between the input active rectifier and the output inverter.

Abstract: A calibrated aerosol source (“CAS”) and related methods for parameterizing, testing, troubleshooting and/or calibrating an instrument (e.g., photometers) or a system. Preferably, the CAS allows for generation of multiple concentrations while maintaining constant particle size distribution (PSD) for all aerosol concentrations, so that the aerosol response at other points in a particular range can be verified and linearity that was previously assumed can be proved.

Abstract: A system can include a first controllable valve configured to output a first control pressure on one or more first pressure control lines, a second controllable valve configured to output a second control pressure on one or more second pressure control lines, and a valve assembly. The valve assembly can be configured to direct the first control pressure to a first functional system and the second control pressure to a second functional system in a first state, direct the first control pressure to both of the first functional system and the second functional system in a second state, and direct the second control pressure to both of the first functional system and the second functional system in a third state.

Abstract: Embodiments can relate to a system for automated exploit generation that receives input data representative of a target action to establish a target having a potential target vulnerability. The system can build a simulated target environment that includes the established target. The system can conduct an analysis method including a static, a concrete, a dynamic, and/or a symbolic analysis. The system can create a chainable sequence including an information disclosure, a read, a write, and/or an execution exploit primitive. The system can generate an exploit chain that, when executed by the processor in response to the target action, can transform the target action to a target failure within the simulated target environment and thereby expose the target vulnerability. The system can execute the exploit chain within the simulated target environment to examine coverage of the exposed target vulnerability. The system can generate an output representative of the exposed target vulnerability.

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

Abstract: A harmonic drive, having a housing extending from first to second outer ends, the housing has radial outer and inner walls that extend axially between the first and second outer ends of the housing to define an annular channel having first and second ends that taper toward the first and second outer ends of the housing; a flex spline that extends axially between first and second ends and has a radial outer surface, and the first and second ends of the flex spline taper radially outwardly, the flex spline is located within the annular channel so that the first end of the flex spline is located within the first end of the annular channel and the second end of the flex spline is located within the second end of the annular channel; and first and second clamps that are clamped against the first and second ends of the annular channel.

Abstract: A heat exchanger includes a first header including a fluid inlet and a second header positioned downstream of the first header with respect to a first flow path of a first fluid and including a fluid outlet. The heat exchanger further includes a core extending from the first header to the second header and a mount structure extending between the first header and the second header. The core includes a plurality of core tubes. The mount structure is integrally formed with a subset group of diverted tubes of the plurality of core tubes and includes one or more internal flow passages that are connected to the subset group of diverted tubes such that the one or more internal flow passages are in flow communication with the first header and the second header in parallel to a non-diverted portion of the core.

Abstract: An air cycle machine for an environmental control system for an aircraft includes at least one turbine configured to receive and extract work from a first medium and a third medium. A compressor is configured to compress a second medium and a shaft mechanically couples the at least one turbine and the compressor. A mixing point is located downstream of at least one turbine. A mixture of the first medium and the third medium generated at the mixing point is provided to another component of the environmental control system.

Abstract: A front-end architecture system includes a system voltage input and a controller electrically connected to the system voltage input. The controller is configured and adapted to provide a voltage output to at least one controller output. The controller includes a single-ended primary-inductor converter (SEPIC) and a monitoring and switchover circuit. A method for controlling a voltage input to a low-voltage power supply (LVPS) includes receiving a system voltage input with a controller, wherein the controller includes a single-ended primary-inductor converter (SEPIC) and a monitoring and switchover circuit. The method includes providing a voltage output of the controller to at least one controller output. The method includes receiving the voltage output with a low-voltage power supply (LVPS) electrically connected to the at least one controller output.

Abstract: A modular, multi-crew life support system and a method of assembling the system involve a fan to draw in ambient air. The system includes one or more assemblies that produce conditioned air from the ambient air, and a housing to support an oxygen source. The system also includes a port configured as an inlet from the oxygen source to augment the conditioned air, and a duct to disperse a result of augmenting the conditioned air as output air to support two or more occupants of an enclosure.

Abstract: An environmental control system of an aircraft includes a primary heat exchanger, a secondary heat exchanger and an air cycle machine. The air cycle machine includes a compressor fluidly coupled to an outlet of the primary heat exchanger and an inlet of the secondary heat exchanger, a dehumidification system arranged in fluid communication with the outlet of the secondary heat exchanger, a first turbine fluidly coupled to an outlet of the secondary heat exchanger and optionally a second turbine disposed downstream of the first turbine that receives air from the first turbine in a normal mode a first humidity sensor disposed fluidly between the first turbine and the second turbine that measures humidity of air that has left the first turbine as it enters the second turbine in the normal mode.

Abstract: A servo valve includes a fluid transfer valve assembly comprising a valve body having a supply port and a control port (C1). The valve body has first and second nozzles and a drive member therebetween, arranged to regulate flow of fluid from the supply port to the control port in response to a control signal. The assembly also includes a drive assembly comprising a magnetic coil and a core passing through the coil and configured to move axially with respect to the coil when the coil is powered by a current dependent on the control signal, the drive assembly arranged to move the drive member relative to the first and second nozzles in response to the control signal.

Abstract: A system includes a filter device that has, in serial flow order, an adsorbent bed, a biocide filter, and a particle filter. The adsorbent bed includes adsorbent media that is configured to remove organic compounds from feed water that are capable of forming an adherent layer on a porous surface of a sublimator, and the biocide filter contains a halogen-release material.

Abstract: A Direct Current (DC)-DC converter includes an input capacitor connected across a positive input terminal and a return input terminal. A DC-DC converter circuit is connected across the positive input terminal and the return input terminal. A current limiting failsafe circuit includes a current limiting portion connected across the positive input terminal and the return input terminal and a failsafe portion connected to a sensed voltage output. The failsafe portion is configured to control a current limit function of the current limiting portion and configured to force the DC-DC converter circuit into an off state in response to retripping of the current limiting portion.

Abstract: A method of controlling dissipation of regenerated power in a multi-channel drive system having a plurality of inverters connected in parallel across an input power supply to drive one or more loads via one or more motors. The method includes determining a circulation current demand for the inverters when the drive system is operating in regenerative mode, the circulating current demand being dependent on the regenerated power and applied to the inverters such that the regenerated power flows through the inverters and is dissipated by the inverters.

Abstract: A conductor shielding termination assembly can include a housing tube defining an inner diameter housing channel therethrough. The housing tube can be made of conductive material. The assembly can include a shoulder bushing configured to insert within the inner diameter housing channel of the housing tube. The shoulder bushing can define an inner diameter bushing channel sized to receive an unshielded portion of a conductor. The assembly can include a clamping assembly configured to clamp around the housing tube and/or the conductor to axially lock the housing tube and the conductor and to trap a shielding termination between the housing tube and the clamping assembly. The clamping assembly can form a clamping inner diameter channel sized to receive a shielded portion of the conductor.

Abstract: A harmonic drive, having: a ground ring; a first flex spline extending axially from the ground ring; a first input shaft that is radially exterior to the first flex spline, the first input shaft includes a first wave generator that engages the first flex spline; a second flex spline, radially within the first flex spline and rotationally coupled to the first flex spline, a second input shaft that is radially within the second flex spline, the second input shaft includes a second wave generator that engages the second flex spline; an output shaft coupled to the second flex spline, the first flex spline includes a first spline that faces radially inward; the second flex spline includes a second spline that faces radially outward; a circular gear having a third spline that face outwardly and engages the first spline; a fourth spline that faces radially inward and engages the second spline.