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.↗
SEARCH · Engineering Papers
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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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.↗
Flight instrument and telemetry response and its inversion
Mathematical models of rate gyros, servo accelerometers, pressure transducers, and telemetry systems were derived and their parameters were obtained from laboratory tests. Analog computer simulations were used extensively for verification of the validity for fast and large input signals. An optimal inversion method was derived to reconstruct input signals from noisy output signals and a computer program was prepared.
Weinberger, M. R.↗
A scanning mirror system for the Apollo telescope mount ultraviolet spectroheliometer
The scanning mirror system described is being developed as the primary mirror in the spectroheliometer. The system consists of a gimbaled mirror mount that is rotated through extremely small angles by the use of frictionless pivots and a closed-loop servo system. Design, fabrication, and test experience are discussed.
Highman, C. O.↗
A stellar tracking reference system
A stellar attitude reference system concept for satellites was studied which promises to permit continuous precision pointing of payloads with accuracies of 0.001 degree without the use of gyroscopes. It is accomplished with the use of a single, clustered star tracker assembly mounted on a non-orthogonal, two gimbal mechanism, driven so as to unwind satellite orbital and orbit precession rates. A set of eight stars was found which assures the presence of an adequate inertial reference on a continuous basis in an arbitrary orbit. Acquisition and operational considerations were investigated and inherent reference redundancy/reliability was established. Preliminary designs for the gimbal mechanism, its servo drive, and the star tracker cluster with its associated signal processing were developed for a baseline sun-synchronous, noon-midnight orbit. The functions required of the onboard computer were determined and the equations to be solved were found. In addition detailed error analyses were carried out, based on structural, thermal and other operational considerations.
Klestadt, B.↗
Computer controlled antenna system
Digital techniques are discussed for application to the servo and control systems of large antennas. The tracking loop for an antenna at a STADAN tracking site is illustrated. The augmentation mode is also considered.
Raumann, N. A.↗
The Goddard helical tape recorder
A spacecraft recorder was developed with the objective of functioning continuously for 5 years. The resulting design employed a metallic tape wound in a 200-turn helix. A direct drive, brushless dc torquer and servo speed control drove the recorder at 3 rpm for recording and 54 rpm for playback.
Martin, F. T.↗
An interim report on remote sensing of environmental pollutants with a Fourier interference spectrometer.
A small Fourier interference spectrometer for sensing environmental pollutants from spacecraft has been developed at the Jet Propulsion Laboratory. The instrument is intended for obtaining high spectral resolution infrared absorption spectra in the 1.2 to 5.5 micron region at speeds sufficiently high for medium altitude orbital satellite surveys. The paper reviews basic details of the instrument servo and infrared detection systems, previously described, as well as recent developments. In particular, the data-handling system, data reduction techniques and optical tolerance problems are discussed. Preliminary results are included.
Schindler, R. A.↗