Woodward, Inc.

A rotary actuator includes a rotor in which a well is formed and a static rotary piston having an inner vane extending into the well. A seal groove and a seal runs along a peripheral face of the inner vane and lateral and longitudinal ends of the static rotary piston. The continuous seal contacts the rotor to form a vane seal transition from a face seal located at the inner vane surface perpendicular to a rotary axis of the rotor to a radial seal located at the lateral end of the interior wall of the static rotary piston in parallel with the rotary axis. Such seal divides the well into two pressure chambers and is configured as a dynamic seal to prevent leakage between them. The radial seal eliminates an interior seal gland wall, allowing for a taller rotor vane and increased rotary torque for a given outside diameter.

The subject matter of this specification can be embodied in, among other things, a system that includes a flexible structure, a power inverter, a first electromechanical device configured to urge movement of a first portion of the flexible structure based on power received from the power inverter, a second electromechanical device configured to urge movement of a second portion of the flexible structure based on power received from the power inverter, a feedback sensor configured to provide a feedback signal indicative of alignment between the first portion and the second portion, and a controller configured to control operation of at least one of the first electromechanical device and the second electromechanical device based on the feedback signal.

A method according to certain embodiments generally involves mixing exhaust gas and air in an exhaust gas recirculation mixer. The method includes directing exhaust gas from an engine to a mixing tube along a first flow path, and directing air to the mixing tube along a second flow path. One of the first flow path or the second flow path is an outer flow path, and the other of the first flow path or the second flow path is an inner flow path surrounded by the outer flow path. The first flow path and the second flow path merge within a throat of the mixing tube such that the exhaust gas and the air mix within the mixing tube to thereby provide a mixture of exhaust gas and air.

An exemplary butterfly valve assembly generally includes a housing, a disc, and an actuator. The housing includes an inner wall defining a bore that extends along a longitudinal axis. The disc is mounted in the bore for pivotal movement about a pivot axis that extends transverse to the longitudinal axis. The disc includes a plate formed of a first material, and a seal surrounding a periphery of the plate and defining an outer edge of the disc. The seal is formed of a second material that is more flexible than the first material. The actuator is operable to pivot the disc about the pivot axis between an open position and a closed position. With the disc in the closed position, the outer edge is positioned adjacent the inner wall to thereby restrict flow through the bore. In certain forms, the butterfly valve assembly may be utilized to control intake airflow for a fuel cell and/or a genset.

An aircraft landing gear includes a main beam coupled to the aircraft for reciprocating movement between a stowed position and a deployed position. An actuator is configured to drive the reciprocating movement of the main beam. The actuator includes a ball screw and a motor. The motor has an output shaft operably coupled to the ball screw through a gear train and configured to drive selective rotation of the ball screw. The actuator further includes a disconnect mechanism with a disconnect fitting rotatably mounted to the ball screw. A biasing fitting engages the disconnect fitting to rotate the disconnect fitting between a first position and a second position. The disconnect fitting transfers rotation of the output shaft to the ball screw when the disconnect fitting is in the first position. The ball screw is isolated from the output shaft when the disconnect fitting is in the second position.

The subject matter of this specification can be embodied in, among other things, a method of sensing that includes measuring an acoustic impedance of a fluid, measuring a first time of flight in a first direction through the fluid, measuring a second time of flight in a second direction through the fluid, determining a mass fluid flow rate based on the measured acoustic impedance, the measured first time of flight, and the measured second time of flight, and providing the determined mass fluid flow rate.

The subject matter of this specification can be embodied in, among other things, an engine assembly having a nacelle partially surrounding an engine, and a thrust reverser having a first element movable relative to the nacelle between a stowed and deployed position, a first hydraulic actuator configured to move the first element between the stowed and deployed position, the first hydraulic actuator being connected to a fluid source and a return reservoir, and a second element movable between a stowed and deployed position, a second hydraulic actuator configured to move the second element between the stowed and deployed position, the second hydraulic actuator being connected to the fluid source and the return reservoir, and a fluid control system having a servo valve operable to selectively route fluid between the fluid source, the first hydraulic actuator, and the return reservoir, and a controller configured to operate the servo valve.

The subject matter of this specification can be embodied in, among other things, an apparatus that includes a first assembly having a first piston rod having a first rod end, a second assembly arranged substantially parallel to the first piston assembly and having a second piston rod having a second rod end, an end assembly defining a first aperture configured to receive the first rod end, and a second aperture configured to receive the second rod end, a first retaining cap configured to affix to the first rod end, abut the end assembly when affixed to the first rod end, and retain the first rod end within the first aperture, and a second retaining cap configured to affix to the second rod end, abut the end assembly when affixed to the second rod end, and retain the second rod end within the second aperture.

Methods and systems for a digital signal processor (DSP) to transmit data between a first central processing unit (CPU) core (a producing core) and a second CPU core (a consuming core). The first and second CPU cores are time-aligned, such that cycles of one or more frames of the first CPU core correlate to one or more cycles of the second CPU core. The first and second CPU cores are configured to access a shared memory, through which data can be written and/or read by the first and second CPU cores.

The subject matter of this specification can be embodied in, among other things, a flow control valve that includes a gate element formed as a spherical segment having a semispherical peripheral edge, a substantially planar face bounded by a substantially elliptical edge at the semispherical peripheral edge, and a channel defined in the substantially planar face and having a first end proximal to a midpoint of the substantially planar face and extends from the first end to a second end defining a notch in the semispherical peripheral edge.