Applications of shearing and Kosters prisms of the alignment of optical telescope Final report
Applicability of shearing and Kosters interferometers in detecting misalignment in optical telescopes
Fredrick, L. W.↗
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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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Ion engine thrust vector study Quarterly report
Ion beam current and direction changes due to electrode misalignment, and analysis of electrode temperature distribution and thermal stresses in ion engine thrust vector
Amboss, K.↗
Approximate analysis of the effects of electrode misalinements on thrust vector control in Kaufman thrusters.
Electrode misalignments effects on thrust vector control for Kaufman electric rocket thrustors, noting implications for SERT 2 mission
Lathem, W. C.↗
Effects of electrode misalinements in Kaufman thrusters.
Electrode misalignments effects on thrust vector control for Kaufman electric rocket thrustors, noting implications for SERT 2 mission
Lathem, W. C.↗
Technique for anchoring fasteners to honeycomb panels
Two-piece fastener bushing provides mounting surface for components on a three-inch thick honeycomb structure. Specially constructed starter drill and sheet metal drill permit drilling without misalignment. Tapered knife-edge cutting tool removes honeycomb core material without tearing the adjacent material.
Brown, W. J.↗
Ion engine thrust vector study, phase 2 Quarterly report
Performance prediction for expected thrust misalignment in electron bombardment ion thruster
Amboss, K.↗
Measurements of leakage in mechanical face seals.
Leakage in mechanical face seals with hydrodynamic films, noting misaligned seal theories for pumping with cavities and two fluids
Findlay, J. A.↗
Mechanical characteristics of the Bossler coupling
Test results indicate the Bossler coupling has unusual capability for accomodating combined axial motion, misalignment, and torque, suitability for applications requiring long life combined with reliability, lightweight, and minimal maintenance, and the ability to survive shock-torque greatly in excess of ultimate continuous torque.
Bossler, R. B., Jr.↗
Measurements of leakage in mechanical face seals
Leakage in mechanical face seals with hydrodynamic films, noting misaligned seal theories for pumping with cavities and two fluids
Findlay, J. A.↗
An evaluation of precision shaft angle encoders
Shaft misalignment effect on accuracy of precision digital shaft angle encoders, using test fixture and optical methods
Moye, J. E.↗
Thermal testing of inflatable solar shields for cryogenic space vehicles
Thermal testing of inflatable solar shields for cryogenic space vehicles, discussing shield misalignment effects on propellant tank temperatures
Doughty, R. O.↗
MESS /Misalignment Estimation Software System/ for in-flight alignment and calibration of spacecraft attitude sensors
Misalignment estimation software system for calibrating in-flight slew angle scale factors and drift rates of OAO gyros
Desjardins, R.↗
A statistical analysis of the roll rate of a launch vehicle under the influence of random fin misalinements
Launch vehicle under influence of random fin misalignments, predicting roll rate by statistical analysis
Madden, R. B.↗
MESS /Misalignment Estimation Software System/ for in-flight alignment and calibration of spacecraft attitude sensors
Misalignment estimation software system /MESS/ for in-flight celestial and inertial reference attitude sensor alignment and calibration on OAO
Desjardins, R.↗
The dynamic characteristics of a turbo-rotor simulator supported on gas-lubricated foil bearings. Part 2: Operation with heating and thermal gradients
A high speed rotor, supported by gas-lubricated foil bearings, is free from self-excited whirl and displays no loss of load capacity when vibrated at frequency equal to the rotational speed. It is demonstrated that in addition to tolerance of geometrical imperfections, misalignment and foreign particles, the foil bearing performs well at elevated temperatures and accommodates appreciable temperature gradients. The foil bearing is endowed with superior wipe-wear characteristics and the flexibility of the foil accounts not only for the stability of the foil bearing, but also for its accommodation of, and compensation for, distortion, contamination, and contact.
Licht, L.↗
Angular momentum desaturation for Skylab using gravity gradient torques
An angular momentum desaturation method for momentum exchange devices of orbiting spacecraft is described. The specific application of the method is to the Skylab which contains three double-gimbaled control moment gyros for precise attitude control and maneuvering. It is assumed that the attitude reference is inertially fixed and that two of the vehicle principal moments of inertia are much larger than the third. Gravity gradient torques and resultant angular momentum accumulation are developed for small deviations from the reference. The assumed moment-of-inertia distribution allows desaturation about all axes with only two attitude angles each for the two axes with large moments of inertia. The necessary desaturation maneuvers can be decoupled for a special set of orbital coordinates. All maneuvers are made during the night portion of the orbit, and the percentage utilized for desaturation is selectable. Expressions for the attitude angle commands are developed assuming infinite vehicle rates. The effect of finite rates introduces an efficiency into the desaturation. Expressions for this efficiency are developed and means for compensation are treated. Arbitrary misalignments between geometric vehicle axes and principal moment-of-inertia axes are permissible. An angle bias about the sun line minimizes the angular momentum accumulation about the sun line projection into the orbital plane. Adaptive desaturation maneuver limiting consistent with the available maneuver momentum is included.
Kennel, H. F.↗
How to apply life adjustment factors for ball and roller bearings
Practical problems applicable to the selection, design, and lubrication of rolling-element bearings are presented and discussed. Design and selection criteria are based upon materials and processing factors such as melting practice, metalworking, and heat treatment. Environmental factors are considered such as bearing misalignment and speed. Selection of a lubricant is based upon elastohydrodynamic lubrication principles in addition to lubricant type and chemistry.
Crecelius, W. J.↗