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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Single rotary valve controls a circular bank of hydraulic leveling cylinders that must maintain large loads within plus or minus three arc minutes of the true vertical. Since the position of the valve spool determines the flow rate of each bank of cylinders and hence cylinder position, different flow rates may be obtained by changing the spool shape.
Sealing hydraulic fluid within a tube and passing the tube through a reducing die produces high quality small diameter refractory metal tubing. The encased fluid eliminates the need for mandrel or ductile core removal and drawing can proceed with less handling operations.
Arm assembly consisting of four flexible tubes controlled by a four-way hydraulic or pneumatic valve can bend in any direction. The flexible arm could be used for probing areas that cannot be reached by ordinary tools, handling hazardous materials, and for graph recording.
Parametric evaluation of hydraulic, pneumatic, and electromechanical actuators for manned spacecraft tasks
Hydraulic system provides smooth control of large tracking and antenna drive systems at very low tracking rates. This configuration modifies a series connection of the drive motors with compensating orifices to offset the effects of drain line loss. Linearization of response by eliminating cogging or cyclic operation is thus obtained.
Fatigue tests using load distributions from actual loading histories encountered in flight are programmed on punched electronic accounting machine cards. With this hydraulic loading system, airframe designers can apply up to 55 load levels to a test specimen.
Special isolator valve prevents malfunction of a closed hydraulic system by converting the initial accumulator-reservoir to a reservoir function only when the system loses oil, or gaseous nitrogen precharge, or has a jammed piston. This permits near-normal operation until the defect is corrected.
Hydraulic axisymmetric focused-jet amplifier for pneumatic digital control
Hydraulic exciter combined environment tests
Materials evaluation, design and fabrication work, and low pressure testing to develop high temperature hydraulic system actuator seals for use in advanced supersonic aircraft
Computer prediction of transient performance of low speed inducer driven by hydraulic turbine
Hydrodynamical and mechanical design layout for two-speed hydraulic turbine inducer, computer simulation of pumping system and test facility performance, and study of demonstration unit
Pumpability, lubricability, and durability of five hydraulic fluids at varying inlet temperatures to evaluate applicability for supersonic aircraft
Contamination effects and controls in Saturn launch vehicle hydraulic systems
Hydraulic compound vortex amplifier optimization
Fluidic control of high hydraulic pressure by means of hydrodynamic vortex phenomenon
Hydraulic fluid powered servo system designs for space applications, noting fluid characteristics and performance over wide viscosity and temperature change
Hydraulic calipers determine area of annular openings in irregular or concealed passages. With modifications the device could be adapted to investigations of cross-sectional changes in heat flow passages, ducts, conduits, and heat exchanger elements.