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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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Circuit multiplies a dc input voltage in the millivolt range to yield a larger dc output voltage bearing a fixed ratio to the input voltage. The supply voltage need not be precisely regulated, the potentiometer need not be linear, and the gain of servo amplifier is not critical.
Apparatus reduces Time Base Error /TBE/ in the playback of digital data from magnetic recording equipment. The apparatus uses a magnet which employs a servo position control of the tape by which the playback data clock is phase locked with a fixed frequency reference signal.
Electric master-slave manipulator uses force multiplication and allows the operator to remotely control the slave arm. Both the master and slave arms execute seven distinct motions by a specially designed force-reflecting servo having a one to one correspondence between the motion at the master and slave.
Fast-response coil drive circuit, for electromagnetic torque motors, reduces the inductive coil time constant with a minimum of circuit sophistication. The low-cost modulator servoamplifier is used with a compatible preamplifier stage which provides the servo-loop function of summing, adjustable gain and compensation.
Hydraulic fluid powered servo system designs for space applications, noting fluid characteristics and performance over wide viscosity and temperature change
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.
Direct current voltage amplifier utilizing principles of servo system for gain stability
Unstabilized astronaut, hand-held and integrated life support EVA maneuvering units tested in gimbaled six degree of freedom servo driven moving base simulator
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.
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.
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.
Comprehensive pointing theory for 16 ft antenna including servo encoder readings
Minimum pointing error of large aperture space telescopes as function of diameter, servo bandwidth, and star brightness
Servo systems for analog automatic reduction of time dependent photomechanical model materials fringe data in stress analysis
Servo systems for analog automatic reduction of time dependent photomechanical model materials fringe data in stress analysis
Desensitized linear servo model following feedback control systems design using specific optimal control concepts
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.
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.