Abstract: A heat exchanger includes a body, a plurality of first flow channels defined in the body; and a plurality of second flow channels defined in the body. The second flow channels are fluidly isolated from the first flow channels. The first flow channels and second flow channels are arranged in a checkerboard pattern.

Abstract: A power converter system includes a first transformer winding. Two switches are operatively connected to the first power winding and ground for controlling the first transformer winding. A holdup charging circuit includes a clamp circuit connected between a first node on a first side of the first transformer winding and a second node on a second side of the first transformer winding. The clamp circuit includes a clamp diode oriented to let current flow through the clamp circuit in a direction from the first node to the second node. The clamp circuit includes a clamp capacitor in series between the clamp diode and the second node. A holdup circuit, including a holdup capacitor, is connected to a third node in the clamp circuit between the clamp diode and the clamp capacitor.

Abstract: A power converter system includes a first transformer winding. A switch is operatively connected between the first transformer winding and ground for controlling the first transformer winding. A holdup charging circuit includes a clamp circuit connected between a first node on a first side of the first transformer winding and a second node on a second side of the first transformer winding. The clamp circuit includes a clamp diode oriented to let current flow through the clamp circuit in a direction from the first node to the second node. The clamp circuit includes a clamp capacitor in series between the clamp diode and the second node. A holdup circuit, including a holdup capacitor, is connected to a third node in the clamp circuit between the clamp diode and the clamp capacitor.

Abstract: An aircraft oil management system includes a generator, pump, and pump control system. The generator is mechanically coupled to a prime mover via a the rotor shaft and is configured to output three-phase power. The pump is mechanically decoupled from the rotor shaft and delivers oil to the generator. The pump control system drives the pump independent of a rotational speed of the rotor shaft.

Abstract: A method is disclosed for treating an anodized metal surface. According to the method, polynuclear clusters comprising aluminum oxide hydroxide are applied to the anodized metal surface.

Abstract: In accordance with at least one aspect of this disclosure, a system can include a primary coil wound around a moveable magnetic core, at least one secondary coil wound in one continuous direction and magnetically coupled with the primary coil, and a controller operatively connected to determine a position of the moveable magnetic core and configured to detect a fault across the secondary coil.

Abstract: Phased array antennas, such as a multi-function aperture, are limited in performance and reliability by traditional air-cooled thermal management systems. A fuel-cooled multi-function aperture passes engine fuel through channels within the ribs of the multi-function aperture to provide better heat transfer than can be achieved through air cooled systems. The increased heat transfer and thermal management results in a multi-function aperture with improved performance and reliability.

Abstract: An Environmental Control System (ECS) for an aircraft includes a ram air system having a ram inlet and a ram outlet. The ECS includes a cabin air compressor motor, a diverter valve, and a dedicated outlet. The cabin air compressor motor has a motor inlet passage and a motor outlet passage with the motor inlet passage being coupled to the ram inlet. The diverter valve includes a first diverter inlet, a first diverter outlet, and a second diverter outlet. The first diverter inlet is coupled to the motor outlet passage. The dedicated outlet is connected to the first diverter outlet in a flight mode of operation of the aircraft and the ram outlet is connected to the second diverter outlet in a ground mode of operation of the aircraft.

Abstract: A fluid recovery system for a laundry system (e.g., of a spacecraft) can include a main line having an inlet configured to fluidly communicate with a washing volume within an agitation chamber to receive washing fluid from the agitation chamber, a vacuum source in fluid communication with the main line to provide a partial vacuum to the inlet to cause washing fluid in the washing volume to at least partially evaporate, and a condenser disposed on the main line downstream of inlet. The condenser can be configured to receive evaporated washing fluid and to condense water in the evaporated washing fluid. The system can include a separator downstream of the condenser configured to separate water and laundry effluent gas, wherein the separator includes a water recovery output configured to output water for reuse.

Abstract: In accordance with at least one aspect of this disclosure, a waste fluid water recovery system can include a waste fluid inlet line configured to connect to a waste fluid source, the waste fluid inlet line comprising one or more treatment components configured to treat the waste fluid, a treated waste fluid outlet line configured to connect to one or more outlets, a tank having a flexible membrane dividing an internal volume of the tank into a first portion and a second portion, a first line fluidly connected to the first portion of the tank, a second line fluidly connected to the second portion of the tank, and a switching valve connected between the first line, the second line, the waste fluid inlet line, and the treated waste fluid outlet line. The switching valve can be configured to connect the first line with the waste fluid inlet line and the second line with the treated waste fluid outlet line in a first state.

Abstract: An eye monitoring system for distress monitoring can include an eye tracking device configured to monitor one or more of an eye position, an eye movement, and/or an eye quality of a user, and to output eye tracking data. The system can also include a distress monitoring module configured to receive the eye tracking data from the eye tracking device and to determine whether the user is in distress based on the eye tracking data (e.g., in real time). The distress monitoring module can be configured to output a distress signal if the user is determined to be in distress.

Abstract: A laundry system can include an input shaft, an output actuator, and a motion converter connected between the input shaft and the output actuator. The motion converter can be configured to convert rotational motion of the input shaft to linear motion of the output actuator. The system can include a laundry agitation arrangement connected to the output actuator to be linearly actuated by the output actuator to agitate laundry.

Abstract: A system to perform multi-stage cleaning of material from a space suit worn by an astronaut in a deep space environment includes one or more discharge units installed external to an interior volume of a facility in the deep space environment. Each of the one or more discharge units releases one or more substances. The one or more substances includes water or air and the interior volume of the facility is defined by an interior hatch that is separated from an exterior hatch leading to the deep space environment by an airlock. One or more collection units installed external to the interior volume. Each collection unit traps released material that is released from a space suit based on the multi-stage cleaning to prevent the released material from entering the interior volume.

Abstract: A turbine rotor includes a base and a plurality of blades. A central nose is radially inward of the blades and defines an axis of rotation. A plurality of cooling manifolds is disposed within the turbine rotor and includes impingement cooling jets extending through a rear surface of the turbine rotor. An internal cooling manifold extends radially inward of the impingement cooling jets and extends between the base and the rear surface of the turbine rotor. A central nose cooling manifold extends into the central nose and is fluidically connected to the internal cooling manifold. A base cooling manifold is fluidically connected to the central nose manifold and extends radially outward from the central nose cooling manifold. A blade cooling manifold is fluidically connected to the base cooling manifold and extends within the blade. Trailing edge jets extend from the blade cooling manifold and through the trailing edge of blades.

Abstract: A handheld applicator for delivery of post-treatment coating following application of a conversion coating includes a first vessel extending longitudinally and containing SOCOSURF PACS™ solution, a second vessel extending longitudinally and containing hydrogen peroxide, a pH indicator contained in one of the first or second vessels, a mixing region configured to combine the SOCOSURF PACS™ solution, hydrogen peroxide, and pH indicator.

Abstract: A wedge for use in an electric machine includes a central portion comprising at least a first material, a first wing integrally attached to the central portion, and a second wing integrally attached to the central portion opposite the first wing, wherein the first wing, and the second wing include a second material.

Abstract: In accordance with at least one aspect of this disclosure, a pump includes a housing having one or more fluid inlets and one or more fluid outlets. The housing is configured to act as a pump housing for passing a fluid from the one or more fluid inlets to the one or more fluid outlets and configured to act as a stator for a motor. The pump also includes a cylinder encased within the housing and mounted on a shaft for rotation within the housing. The cylinder is configured to act as an impeller to drive fluid from the one or more fluid inlets through the housing to the one or more fluid outlets and configured to act as a rotor for the motor.

Abstract: A power factor correction circuit comprising: a global voltage input; and means for deriving a reference current from the global voltage; whereby the means for deriving the reference current comprises a leading phase admittance cancellation, LPAC, transfer function and a filter, whereby the reference current is derived from a sum of an output of the LPAC transfer function and an output of the filter.

Abstract: A fuel system includes a main pump assembly. The main pump assembly has a main fuel pump connected to an input line, a recirculation pump connected to the input line, and a fuel recirculation system. A recirculation control includes a first selector valve in fluid communication with an outlet line of the recirculation pump, with a recirculation return line connected to return fuel to the input line, and with an inter-valve line. The recirculation control includes a second selector valve in fluid communication with the inter-valve line, with a back-up line connecting the second selector valve to a main fuel control, and with a cooler recirculation line connected to supply the one or more coolers.

Abstract: A system includes a vibration detector to detect a location of vibration and identify a frequency of the vibration. The system also includes a controller to generate audio corresponding to the frequency of vibration detected by the vibration detector and one or more speakers configured to provide the audio as directional sound.