Abstract: An environmental control system of an aircraft includes a plurality of inlets for receiving a plurality of mediums including a first medium and a second medium and an outlet for delivering a conditioned flow of the second medium to one or more loads of the aircraft. A ram air circuit includes a ram air shell having at least one heat exchanger positioned therein. A compressing device is arranged in fluid communication with the ram air circuit and the outlet. The compressing device including a first compressor, a second compressor, and at least one turbine operably coupled via a shaft. The first compressor and the second compressor are arranged in parallel with respect to a flow of the second medium and the first medium is used as a heat sink by another component within the environmental control system.

Abstract: A computer-implemented method for additive manufacturing can include receiving, by one or more computing devices, three-dimensional model data, and receiving, by the one or more computing devices, one or more inducing variables. The one or more inducing variables can include at least one of a recoater direction, recoater force, gas flow direction, and/or gas flow rate. The computer-implemented method can also comprise creating a print file as a function of the one or more inducing variables to account for the inducing variables to produce a uniform part throughout a build area or otherwise reduce part variability and outputting the print file to a printer or a data storage device.

Abstract: A power supply system includes a first saturable reactor electrically connected to a first AC phase input, to a second AC phase input, and to a third AC phase input. The first saturable reactor is electrically connected to a first DC output. A second saturable reactor is electrically connected in parallel with the first saturable reactor to the first AC phase input, to the second AC phase input, and to the third AC phase input. The second saturable reactor is electrically connected to a second DC output. A reactor controller can be operatively connected to the first saturable reactor and to the second saturable reactor to regulate DC output voltage to the first and second DC outputs.

Abstract: Provided are embodiments for circuit for detecting an open-wire condition for a differential input. Embodiments include a sensor, and a line replaceable unit (LRU) coupled to the sensor, wherein the LRU comprises a differential amplifier to provide a sensor output. Embodiments can also include a synchronous demodulator coupled to an output of the differential amplifier through an alternating current (AC) coupling network, wherein the synchronous demodulator is configured to receive the differential amplifier output and a reference signal at the synchronous demodulator signal input and reference input, and provide a synchronous demodulator output voltage to indicate an open-wire condition. Also provided are embodiments of a method for detecting an open-wire condition for a differential input.

Abstract: A system includes an enclosed laser powder bed fusion (LPBF) containment volume. A powder drain is included below the containment volume configured to receive powder dropping from the containment volume by force of gravity. A valve below the powder drain is configured to allow passage with the valve in an open state of unfused powder from the drain into a powder collection volume separated from the containment volume by the valve, and prevent passage of powder from the drain into the collection volume with the valve in a closed state. A source of wetting agent is in fluid communication with the powder collection volume for capturing powder in the collection volume by wetting the powder. A moisture trap is operatively connected to the drain above the valve and is configured to capture moisture to prevent moisture from the collection volume migrating into the containment volume.

Abstract: A solenoid driven actuator system includes a first solenoid having at least one pressure input and a pressure outlet downstream from the at least one pressure input. The system includes a second solenoid having at least one pressure input and a pressure outlet downstream from the at least one pressure input. The system includes a pressure-switching valve operatively coupled to the first and second solenoids. The system includes an actuator operatively coupled to the pressure outlet of the second solenoid.

Abstract: A filter assembly for a servo valve that includes a first fluid nozzle defining a first fluid passage therethrough between a first fluid inlet and a first fluid outlet and a second fluid nozzle defining a second fluid passage therethrough between a second fluid inlet and a second fluid outlet. The first and second fluid nozzles arranged in end to end abutment with each other to form a tubular fluid nozzle unit in which the first and second fluid inlets are adjacent each other, and the first and second fluid passages align to form a common fluid passage through the tubular fluid nozzle unit. The first fluid outlet is at a first end of the tubular fluid nozzle unit and the second fluid passage being at a second, end of the tubular fluid nozzle unit.

Abstract: A logic gate system for fault insertion testing can include a logic gate module having a plurality of input pins. The plurality of input pins can include an input signal pin configured to receive an input signal, a power supply input pin configured to receive power from a power supply, and a test input pin. The logic gate module can also include an output pin connected to the input pins via one or more logic gates. The logic gate system can include a power supply line connected to the power supply input pin and the test input pin. The logic gate system can also include a zero-ohm jumper resistor disposed between the power supply input pin and the test input pin. The zero-ohm resistor can be configured to be replaced with a low ohm resistor to allow reverse driving a voltage on the test input pin. The one or more logic gates can be configured to reverse an output at the output pin when the voltage on the test input pin is reverse driven.

Abstract: An electric propulsion system is provided which includes a prime mover; an electric generator which is arranged to be driven by the prime mover to generate electric power; an electric propulsion motor; and an integrated generator-motor controller arranged to control the supply of said electric power to the electric propulsion motor in response to a control signal. The integrated generator-motor controller is also arranged to feed-forward to the generator a power demand parameter associated with the control signal so as to control the power output of the generator.

Abstract: An environmental control system of an aircraft includes a ram air circuit including a ram air shell having at least one heat exchanger positioned therein and a divider arranged within the ram air shell to separate the ram air shell into a first region and a second region. The at least one heat exchanger is arranged within both the first region and the second region. A first medium is configured to flow through the first region and a second, distinct medium is configured to flow through the second region. The environmental control system additionally includes a dehumidification system arranged in fluid communication with the ram air circuit and a compression device arranged in fluid communication with the ram air circuit and the dehumidification system.

Abstract: An environmental control system of an aircraft includes a plurality of inlets for receiving a plurality of mediums including a first medium, a second medium, and a third medium and an outlet for delivering a conditioned flow of the second medium to one or more loads of the aircraft. At least one compressing device is arranged in in fluid communication with the plurality of inlets and the outlet. The at least one compressing device includes a four-wheel compressing device having a compressor and at least one turbine operably coupled via a shaft. In a first mode of operation, the compressor is driven by the first medium, and in a second mode of operation, the compressor is driven by the third medium.

Abstract: Automated replenishment of consumables is a growing area of interest for customers and businesses alike, in that it has the potential to both improve customer satisfaction and create a steady stream of orders for a consumable service or product. As recognized herein, kitchen appliances, including those for dispensing beverages, present specific challenges to integration with a replenishment service, especially where multiple packages or formats of consumables may be utilized by a single kitchen appliance. Aspects provided herein include methods, systems, and devices for tracking consumption of foodstuffs prepared by a kitchen appliance, including either counting discrete quantities of foodstuffs or estimating non-discrete quantities. A signal requesting replenishment of at least one foodstuff may be transmitted to a replenishment server based on the counting and/or estimating.

Abstract: A containment structure for a rotor includes a shroud and a shroud reinforcement. The shroud is coaxial with and partially surrounds the rotor and includes a tubular section, a transition section, and a flange section. The tubular section extends axially past a first side of the rotor. The transition section connects to the tubular section and is adjacent to a curved side of the rotor. The flange section connects to the transition section opposite the tubular section. The flange section extends radially past a radially outer side of the rotor. The shroud reinforcement is connected to a radially outer surface of the transition section. The shroud reinforcement encloses the transition section and includes a support scaffold and a reinforcing material. The support scaffold includes a series of geometric retaining features encircling a radially outer surface of the transition section. The reinforcing material couples to the support scaffold and restricts shroud radial expansion.

Abstract: A power system includes a liquid hydrogen fuel source including a fuel tank containing a volume of hydrogen fuel. The fuel tank includes two or more vacuum insulation layers, and a liquid insulation material positioned between the two or more vacuum insulation layers. A first power generator located fluidly downstream of the hydrogen fuel source. The first power generator utilizes a flow of hydrogen fuel from the volume of hydrogen fuel to generate electrical or mechanical power.

Abstract: Techniques for secure communication is provided. The techniques include requesting first smart contract execution by one or more nodes of the communication system to determine permissions for communication; performing communication based on the requested permissions; and requesting second smart contract execution by one or more nodes of the communication system to verify information associated with the communication.

Abstract: A system includes a generator. Three AC feeders are connected for feeding AC output from the generator. A rectifier is electrically connected to the three AC feeders and to a load via a first DC feeder and a second DC feeder. A first resistor connects between a first one of the DC feeders and ground. A first voltage sensor is operatively connected to detect voltage across the first resistor. A second resistor connects between the second DC feeder and ground. A second voltage sensor is operatively connected to detect voltage across the second resistor. A controller is configured to monitor for changes in common mode voltage based on the input from the first sensor and from the second sensor, and to determine presence of a fault if change in the common mode voltage exceeds a predetermined threshold.

Abstract: A method of controlling an operating voltage of an electrical system for supplying electrical power to a load and an electrical system for supplying electrical power to a load are described herein. The method comprises charging an energy storage unit using electrical power at a predetermined voltage, wherein the energy storage unit comprises a capacitor; removing the operating voltage; and discharging the energy storage unit across a fixed load. The method further comprises monitoring a discharge voltage across the fixed load over a period of time; determining a time constant of the energy storage unit based on the monitored discharge voltage; and comparing the time constant to a threshold value. If the time constant is higher than the threshold value, the method comprises decreasing the operating voltage. If the time constant is lower than the threshold value, the method comprises increasing the operating voltage.

Abstract: A system includes a generator. Three AC feeders are connected for feeding AC output from the generator. A rectifier is electrically connected to the three AC feeders and to a load via a first DC feeder and a second DC feeder. A first resistor connects between a the first DC feeder and ground. A second resistor connects between the second DC feeder and ground. At least one of a first current sensor is operatively connected to detect current in the first DC feeder and/or a second current sensor is operatively connected to detect current in the second DC feeder. A controller is configured to monitor for changes in common mode current based on the input from the at least one current sensor, and to determine presence of a fault if change in the common mode current exceeds a predetermined threshold.

Abstract: A fluid-cooled electrical component includes a housing having a bottom wall, an outer wall extending from a first surface of the bottom wall, an inner wall extending from the first surface of the bottom wall, the outer and inner walls forming a first cavity therebetween, and the inner wall forming a second cavity therewithin, and one or more fluid channels formed in the inner wall of the housing, adapted and configured to pass a cooling fluid therethrough. The fluid-cooled electrical component also includes a first electrical component disposed in the first cavity, and a second electrical component disposed in the second cavity, both the first and second electrical components being adapted and configured to expel heat through the housing, into the cooling fluid.

Abstract: A system includes a generator. Three AC feeders are connected for feeding AC output from the generator. A rectifier is electrically connected to the three AC feeders and to a load via a first DC feeder and a second DC feeder. A first resistor connects between a first one of the DC feeders and ground. A first voltage sensor is operatively connected to detect voltage across the first resistor. A second resistor connects between the second DC feeder and ground. A second voltage sensor is operatively connected to detect voltage across the second resistor. A controller is configured to monitor for changes in common mode voltage based on the input from the first sensor and from the second sensor, and to determine presence of a fault if change in the common mode voltage exceeds a predetermined threshold.