Abstract: An engine vibration isolation subframe for aircraft includes a forward frame and a forward beam connected to the forward frame. The forward beam includes a first end configured to connect to a first engine and a second end configured to connect to a second engine. An aft frame is disposed aft of the forward frame and includes a first aft beam connected to the aft frame and the first engine and a second aft beam connected to the aft frame and the second engine, where the second aft beam is disposed substantially opposite the first aft beam. At least one forward isolator assembly is connected to the forward frame and at least one aft isolator assembly is connected to the aft frame.

Abstract: A system includes photodetectors each having a field of view and reflectors each respectively aimed at one of the fields of view. A beam-steering device is movable to different positions aimed at the different reflectors. A light emitter is aimed at the beam-steering device. The beam-steering device alternates aim between the reflectors to selectively illuminate the different fields of view.

Abstract: A LIDAR system includes a transmitter unit constructed and arranged to generate light and a photodetector structure for detecting received, reflected light. An actively tunable narrow band optical filter structure is located upstream of the photodetector structure to filter out wavelengths of light associated with sunlight prior to being received by the photodetector structure. The filter structure is constructed and arranged to change optical filtering thereof so as to change wavelengths of light permitted to pass there-through. A photodiode detects light passing through the filter structure. A control unit is associated with the photodiode and the filter structure and is constructed and arranged such that based on the light detected by the photodiode, the control unit can cause the filter structure to change the optical filtering thereof by heating or rotating the filter structure so as to compensate for drifting or broadening of a wavelength of the transmitter unit.

Abstract: A parking brake system is disclosed and includes one or more pressure transducers that monitor the fluid pressure of the parking brake system and a brake selection device configured to indicate the parking brake system is either in an engaged state or a disengaged state. The parking brake system includes one or more processors and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the parking brake system to determine the fluid pressure of the parking brake system is less than a threshold pressure. In response to determining the fluid pressure of the parking brake system is less than the threshold pressure, the parking brake system instructs the brake selection device to indicate the parking brake system is in the disengaged state.

Abstract: An engine vibration isolation subframe for aircraft includes a forward frame and a forward beam connected to the forward frame. The forward beam includes a first end configured to connect to a first engine and a second end configured to connect to a second engine. An aft frame is disposed aft of the forward frame and includes a first aft beam connected to the aft frame and the first engine and a second aft beam connected to the aft frame and the second engine, where the second aft beam is disposed substantially opposite the first aft beam. At least one forward isolator assembly is connected to the forward frame and at least one aft isolator assembly is connected to the aft frame.

Abstract: A brake system for a vehicle is disclosed and includes an energy storage device configured to store and discharge energy, a plurality of wheels having an observer wheel, one or more processors operatively coupled to the energy storage device, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the brake system is operating in a backup mode of operation. In response to determining the brake system is operating in the backup mode of operation, the brake system is caused to apply a first brake pressure command to the observer wheel. In response to determining the observer wheel is starting the skid condition, the brake system is caused to determine a second brake pressure command based on a target slip value.

Abstract: Brake control systems are disclosed herein. A brake control system comprises a first set of analog-to-digital converters in electrical communication with a first set of brake input mechanism sensors and a second set of analog-to-digital converters in electrical communication with a second set of brake input mechanism sensors. The first and second sets of analog-to-digital converters comprise one or more of different hardware and different software for differentially manipulating sensor outputs received from the brake input mechanism sensors.

Abstract: A brake system includes a brake stack having a stack closure pressure, a force member positioned within a cylinder, a valve configured to control fluid pressure of the brake system, and one or more pressure transducers that generate a proportional electrical signal representative of the fluid pressure within the cylinder. The brake system also includes one or more processors in electronic communication with the valve, the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the stack closure pressure of the brake stack.

Abstract: A brake system for a vehicle is disclosed and includes an energy storage device configured to store and discharge energy, a plurality of wheels, one or more processors operatively coupled to the energy storage device, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the brake system is operating in a backup mode of operation. In response to determining the brake system is operating in the backup mode of operation, the brake system calculates a dynamic slip of the plurality of wheels. The brake system is caused to determine a slip error by comparing the dynamic slip with a target slip value of the plurality of wheels. The brake system is also caused to calculate an antiskid command based on the slip error.

Abstract: A parking brake system is disclosed and includes a parking brake valve configured to maintain a fluid pressure of the parking brake system and one or more pressure transducers that monitor the fluid pressure of the parking brake system. The parking brake system also includes a bistable control valve fluidly connected to the parking brake valve, one or more processors in electronic communication with the bistable control valve, the parking brake valve, and the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the parking brake system to instruct the bistable control valve to actuate into the opened position when the fluid pressure of the parking brake system is less than a threshold pressure.

Abstract: Brake control systems are disclosed herein. A brake control system comprises a first set of analog-to-digital converters in electrical communication with a first set of brake input mechanism sensors and a second set of analog-to-digital converters in electrical communication with a second set of brake input mechanism sensors. The first and second sets of analog-to-digital converters comprise one or more of different hardware and different software for differentially manipulating sensor outputs received from the brake input mechanism sensors.

Abstract: A Lidar system includes an array of photodetectors. The system includes a beam-steering device and a light emitter aimed at the beam-steering device. The beam-steering device is designed to aim light from the light emitter into a field of illumination positioned to be detected by a segment of the array of photodetectors. The segment is smaller than the array. The system includes a computer having a processor and memory storing instructions executable by the processor to adjust the aim of the beam-steering device to move the field of illumination relative to the array of photodetectors.

Abstract: A brake system is disclosed. The brake system includes a brake stack having a stack closure pressure, a force member positioned within a cylinder, a valve configured to control the fluid pressure of the brake system, and one or more pressure transducers that generate a proportional electrical signal representative of fluid pressure within the cylinder. The brake system also includes one or more processors in electronic communication with the valve, the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the stack closure pressure of the brake stack.

Abstract: A parking brake system is disclosed and includes a parking brake valve configured to maintain a fluid pressure of the parking brake system and one or more pressure transducers that monitor the fluid pressure of the parking brake system. The parking brake system also includes a bistable control valve fluidly connected to the parking brake valve, one or more processors in electronic communication with the bistable control valve, the parking brake valve, and the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the parking brake system to instruct the bistable control valve to actuate into the opened position when the fluid pressure of the parking brake system is less than a threshold pressure.

Abstract: A parking brake system is disclosed and includes one or more pressure transducers that monitor the fluid pressure of the parking brake system and a brake selection device configured to indicate the parking brake system is either in an engaged state or a disengaged state. The parking brake system includes one or more processors and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the parking brake system to determine the fluid pressure of the parking brake system is less than a threshold pressure. In response to determining the fluid pressure of the parking brake system is less than the threshold pressure, the parking brake system instructs the brake selection device to indicate the parking brake system is in the disengaged state.

Abstract: A brake system for a vehicle is disclosed and includes an energy storage device configured to store and discharge energy, a plurality of wheels, one or more processors operatively coupled to the energy storage device, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the brake system is operating in a backup mode of operation. In response to determining the brake system is operating in the backup mode of operation, the brake system calculates a dynamic slip of the plurality of wheels. The brake system is caused to determine a slip error by comparing the dynamic slip with a target slip value of the plurality of wheels. The brake system is also caused to calculate an antiskid command based on the slip error.

Abstract: A brake system for a vehicle is disclosed and includes an energy storage device configured to store and discharge energy, a plurality of wheels having an observer wheel, one or more processors operatively coupled to the energy storage device, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the brake system is operating in a backup mode of operation. In response to determining the brake system is operating in the backup mode of operation, the brake system is caused to apply a first brake pressure command to the observer wheel. In response to determining the observer wheel is starting the skid condition, the brake system is caused to determine a second brake pressure command based on a target slip value.

Abstract: Various embodiments include methods and apparatus structured to increase efficiencies of a drilling operation. An apparatus can be structured to include a sleeve structured to operatively fit over a liner or a casing in a wellbore. The sleeve can be structured with a packer element disposed such that the liner or the casing is capable of rotation within the sleeve when the sleeve with the packer element is operationally non-rotating. Additional apparatus, systems, and methods can be implemented in a variety of applications.

Abstract: A brake system is disclosed. The brake system includes a brake stack having a stack closure pressure, a force member positioned within a cylinder, a valve configured to control fluid pressure of the brake system, and one or more pressure transducers that generate a proportional electrical signal representative of the fluid pressure within the cylinder. The brake system also includes one or more processors in electronic communication with the valve, the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the stack closure pressure of the brake stack.

Abstract: A brake system is disclosed. The brake system includes a brake stack having a stack closure pressure, a force member positioned within a cylinder, a valve configured to control the fluid pressure of the brake system, and one or more pressure transducers that generate a proportional electrical signal representative of fluid pressure within the cylinder. The brake system also includes one or more processors in electronic communication with the valve, the one or more pressure transducers, and a memory coupled to the one or more processors. The memory stores data comprising a database and program code that, when executed by the one or more processors, causes the brake system to determine the stack closure pressure of the brake stack.