Data for hydraulic systems in space.
Hydraulic fluid powered servo system designs for space applications, noting fluid characteristics and performance over wide viscosity and temperature change
Waterman, A. W.↗
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Results for “SERVO”
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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Pulse-code-modulation baseline correction for low signal-to-noise ratios
Time-shared integrate-hold-dump circuits separate the dc level due to the signal /bit information/ from the dc signal due to the baseline error. The system detects the baseline error, filters it, and then algebraically adds enough voltage to a servo loop to reduce the error to zero.
Stephens, T. J.↗
An electro-mechanical dc voltage amplifier
Direct current voltage amplifier utilizing principles of servo system for gain stability
Savelle, C. R., Jr.↗
EVA maneuvering unit comparison.
Unstabilized astronaut, hand-held and integrated life support EVA maneuvering units tested in gimbaled six degree of freedom servo driven moving base simulator
Tobey, W. H.↗
Slow-speed drives for miniature devices
Hysteresis motor minimizes motor torque variations during shaft revolution when operated at high frequency and with a sinusoidal motor current. Motor speed is stabilized by a feedback servo.
Bahm, E. J.↗
Electronically controlled motor drive system has ultra-high reliability and long lifetime
Direct drive electromechanical system is composed of brushless dc torque motor, offset-tooth magnetic sensor that derives position and rate information directly from output shaft, and rotary power transformer that transfers electrical power from external source to proper load. System has high servo loop stiffness and minimum power consumption.
Veillette, L. J.↗
Thumb-actuated control device
Rotary potentiometer device on the spoke of an aircraft steering wheel provides servo control of certain flight characteristics with no visual attention and a minimum of operational movement.
Hadland, W. O.↗
Pointing of the 16 foot antenna
Comprehensive pointing theory for 16 ft antenna including servo encoder readings
Cogdell, J. R.↗
Precision pointing of large aperture, diffraction-limited, space telescopes
Minimum pointing error of large aperture space telescopes as function of diameter, servo bandwidth, and star brightness
Wischnia, H. F.↗
Two systems for automatic reduction of time- dependent photomechanics data
Servo systems for analog automatic reduction of time dependent photomechanical model materials fringe data in stress analysis
Fowlkes, C. W.↗
Two systems for automatic reduction of time- dependent photomechanics data
Servo systems for analog automatic reduction of time dependent photomechanical model materials fringe data in stress analysis
Fowlkes, C. W.↗
The application of specific optimal control to the design of desensitized model following control systems
Desensitized linear servo model following feedback control systems design using specific optimal control concepts
Roy, R. J.↗
Pneumatic amplifier controls high pressure fluid supply
Pneumatic servo system has pneumatic amplifier containing novel control valve that provides linear control of the flow rate. Fluid supply is isolated from control pressure.
Johnson, H. L.↗
Stabilization of interferometer fringe patterns
Fringe pattern motion is compensated by closed-loop servo system that adjusts a mirror mounted on piezoelectric crystal, so that path difference in interferometer is maintained at constant values at one point in the field. System is applicable to holography with continuous wave laser sources.
Brown, R. M.↗
Automatic welding speed controller Patent
Welding torch with automatic speed controller using speed sensing wheel and closed servo system
Wall, W. A., Jr.↗
Energy limiter for hydraulic actuators Patent
System to control speed of hydraulically movable members by limiting energy applied to actuators with hydraulic servo loop
Steinmetz, C. P.↗
Fluidic power control systems
Pneumatic and hydraulic fluidic power control systems, discussing moving part position servos and cold gas reaction systems
Rose, R. K.↗
A method of eliminating hydrogen maser wall shift
Maser output frequency shift was prevented by storage bulb kept at temperature at which wall shift is zero and effects of bulb size, shape, and surface texture are eliminated. Servo system is shown, along with bidirectional counter.
Levine, M. W.↗