Optimization of conical hydrostatic bearing for minimum friction
Conical hydrostatic bearing optimal dimensions for friction reduction based on laminar and turbulent flow velocity, load capacity, and friction torque calculations
Anderson, W. J.↗
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Results for “torque”
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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SERT 2 spacecraft attitude response
Analysis of SERT 2 spacecraft attitude response including magnetic, solar pressure, and ion thruster disturbance torques
Leroy, B. E.↗
Design features and results from fatigue reliability research machines
Design and performance tests for reversed bending with steady torque fatigue test machine using notched steel specimens
Lalli, V. R.↗
Passage through resonance
Gravitational and tidal torque effects on Mercury spin rate as model of passage through resonance
Kyner, W. T.↗
Optimal desaturation of momentum exchange control systems
Optimal momentum exchange desaturation in attitude control systems for orbiting spacecraft, concerning gravity gradient and disturbance torques
Johnson, C. D.↗
Antiwear and EP additive effects during rolling and spinning contact with a synthesized hydrocarbon oil
Synthesized hydrocarbon oil antiwear and extreme pressure additives effects on bearing spinning torque and endurance
Zaretsky, E. V.↗
Passive damping of the forced precession motion of a two-body satellite
Two-body satellite of axisymmetric rigid bodies interconnected by lossy universal joint, calculating transient oscillation damping of forced precession under external torque
Lim, W. K.↗
Effect of crew motions on spacecraft orientation
On-off control system with crew motion caused random disturbing torques on spacecraft, determining waiting time, jet firing frequency and fuel consumption rate
Armstrong, R. L.↗
Spin-orbit resonance of Mercury
Mercury spin orbit resonance probability computation, making a priori assumptions for long term orbital variations, tidal torque and equatorial asymmetry
Counselman, C. C., III↗
Simulator development, description, and use for a rotating space station
Rotating space station simulator for translational and rotational motion determination under gravity gradient torque action and control under input state conditions
Land, W. H., Jr.↗
Two-stage coaxial gas compressor
Compressor raises pressure of gases from low ambient supply during space experiments by a system of low weight, size, and power input. Dc rotary-torque motor and ball-screw drive shaft activate first and second stage of compressor, utilizing inertia forces to operate check valves.
Wang, W. S.↗
Sprag solenoid brake
Operation of solenoid braking mechanism is discussed. Illustrations of construction of the brake are provided. Device is used for braking low or medium speed shaft rotations and produces approximately ten times braking torque of similar solenoid brakes.
Dane, P. H.↗
Planetary explorer liquid propulsion study
An analytical evaluation of several candidate monopropellant hydrazine propulsion system approaches is conducted in order to define the most suitable configuration for the combined velocity and attitude control system for the Planetary Explorer spacecraft. Both orbiter and probe-type missions to the planet Venus are considered. The spacecraft concept is that of a Delta launched spin-stabilized vehicle. Velocity control is obtained through preprogrammed pulse-mode firing of the thrusters in synchronism with the spacecraft spin rate. Configuration selection is found to be strongly influenced by the possible error torques induced by uncertainties in thruster operation and installation. The propulsion systems defined are based on maximum use of existing, qualified components. Ground support equipment requirements are defined and system development testing outlined.
Mckevitt, F. X.↗
Examination of the anomalous behavior of three gravity gradient satellites
The anomalous oscillatory behavior of three satellites was examined. The satellites were all hinged, two-body, gravity gradient configurations passively stabilized about their three principal axes by gravity gradient and damper torques. Two basic behavior patterns were observed. Either the satellites were stable with attitude perturbations less than + or - 5 deg or their behavior tended towards a low frequency rigid body oscillation dominated by large yaw motions and in some cases by yaw inversions. A causal relationship between sun angle and the character of satellite behavior was observed which appears to indicate that thermal distortion is a critical factor in a gravity gradient satellite's dynamic behavior. The behavior appeared to be futher modified by the existence of response frequencies that were higher than anticipated values.
Goldman, R. L.↗
CMG assembly life test and engineering evaluation test, M-509 experiment
The initial checkout of the control moment gyro system for the astronaut stabilizer maneuvering unit is described, and the test results are presented. The life test proceeded smoothly to its completion, and problem areas encountered in the engineering tests are described. These tests included command rate and torquer current transfer, cage and lock, static inverter and signal noise, dynamic response, closed loop drift rate, and gimbal disturbance torque evaluation tests.
Cramer, P. S.↗
Development of Skylab experiment T-013 crew/vehicle disturbances
A Skylab experiment to determine the characteristics and effects of crew-motion disturbances was developed. The experiment will correlate data from histories of specified astronaut body motions, the disturbance forces and torques produced by these motions, and the resultant spacecraft control system response to the disturbances. Primary application of crew-motion disturbance data will be to the sizing and design of future manned spacecraft control and stabilization systems. The development of the crew/vehicle disturbances experiment is described, and a mathematical model of human body motion which may be used for analysis of a variety of man-motion activities is derived.
Conway, B. A.↗
Correlation of windage-loss data for a Lundell alternator
Viscous torque (windage) of a Lundell-shaped rotor having a major diameter of 20.3 cm (8 in.) rotating within a concentric housing was measured at speeds up to 36,000 rpm. The center cylindrical section of the housing was tested with both a smooth surface and axial slots to simulate alternator winding slots. For concentric cylinders, the range of Reynolds numbers was extended to 70,000. Three radial clearances, 1, 2, and 4 mm (0.04, 0.08, and 0.16in.), corresponding to 1, 2, and 4 percent of the rotor radius, were tested.
Kempke, E. E., Jr.↗
Preliminary design of a shuttle docking and cargo handling system
Work performed prior to concept selection, concept evaluation, and the preliminary design are summarized. The initial work included selection of the requirements and guidelines used to formulate concepts; analysis to determine detailed requirements for reach, velocity, torque, etc.; formulation of the alternative concepts; the evaluation and ranking of the concepts; and the selection of a concept. The man-in-the-loop simulation performed with a six degree of freedom moving base simulator and a three degree of freedom manipulator arm are described. The analysis and tradeoffs of those design parameters which are the key to the preliminary design are described. Estimates for a future development program are presented, including a schedule and manpower breakdown and cost estimate. The system design parameters, with a weight and power breakdown are summarized.
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