Results 141 to 150 of about 3,143,831 (179)

A Hero-Jet Driven Porous Spherical Hydrostatic Gas Bearing Gyro

Journal of Lubrication Technology, 1973
The gyro system under consideration consists of a hollow porous sphere supported in a hydrostatic gas-lubricated spherical bearing. High pressure gas leaking into the sphere through the pores from the bearing film pressurizes the inside of the sphere and is exhausted from a series of Hero jets located around the equator to counter the viscous drag from
A. L. Gu, J. A. Walowit, D. F. Wilcock
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Possibility of elasto-hydrostatic evolved-gas bearing as one of the mechanisms of superlubricity

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2017
In this article, firstly the experiments previously reported have been reviewed. That is, in the experiments conducted earlier it was seen that the friction coefficient reduced to the friction-tester noise-level of 0.0001, and only a small amount of sliding marks was seen on the tribofilm by scanning electron microscopic ...
Takahisa Kato, Hiroshige Matsuoka, Masahiro Kawaguchi, Masataka Nosaka   +3 more
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Rotordynamic Performance of Flexure Pivot Hydrostatic Gas Bearings for Oil-Free Turbomachinery

Volume 6: Turbo Expo 2004, 2004
Micro-turbomachinery demands gas bearings to ensure compactness, lightweight and extreme temperature operation. Gas bearings with large stiffness and damping, and preferably of low cost, will enable successful commercial applications. Presently, tests conducted on a small rotor supported on flexure pivot–hydrostatic pad gas bearings (FPTPBs ...
Luis San Andre´S
exaly   +2 more sources

Effects of Internally Charged Hydrostatic Gas Bearing on Performance of Gas Springs in Free Piston Stirling Engine

Case Studies in Thermal Engineering
The pneumatic supporting system consisting of gas springs and self-charged hydrostatic bearings can suppress vibrations and improve durability of free piston Stirling engines.
Lingxuan Kong
exaly   +2 more sources

Hydrostatic Gas Journal Bearings for Micro-Turbomachinery

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C, 2003
Several years ago an effort was undertaken at MIT to develop high-speed rotating MEMS (Micro Electro-Mechanical Systems) using computer chip fabrication technology. To enable high-power density the micro-turbomachinery must be run at tip speeds of order 500 m/s, comparable to conventional scale turbomachinery.
L. X. Liu, C. J. Teo, A. H. Epstein, Z. S. Spakovszky   +3 more
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Scaling Laws for Ultra-Short Hydrostatic Gas Journal Bearings

Volume 5: 19th Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C, 2003
The journal bearings of the MIT micro-devices are located at the outer periphery of the rotor and are designed to operate at rotational speeds of order 2 million rpm in order to enable high-power densities with turbomachinery tip speeds near 500 m/s. These journal bearings are very short compared to their relatively large bearing diameters such that ...
Z. S. Spakovszky, L. X. Liu
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A Porous Hydrostatic Gas Bearing for Use in Miniature Turbomachinery

A S L E Transactions, 1971
An analytical program was conducted to establish recommended types of gas-lubricated journal bearings for use in miniature cryogenic turbomachinery. Very high rotative speeds, and the limiting damping properties of gas, indicated that fractional frequency whirl is prevalent, and the most difficult problem to overcome.
S. Heller, W. Shapiro, O. Decker
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Study on the Rotation Accuracy of Gas Hydrostatic Bearings Based on Skin Model Shapes

Precision Engineering
Jin Jin
exaly   +2 more sources

Design and Test of Hydrostatic Gas Bearings for a Hybrid Cryogenic Refrigerator

Advanced Energy Systems, 2003
A hybrid pulse-tube/reverse-Brayton cryocooler is being developed that integrates a regenerative, pulse-tube upper stage with a recuperative, reverse-Brayton lower stage using a flow rectification system consisting of check-valves and buffer volumes.
Jonathan C. Evans, Gregory F. Nellis
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Vibration of a hydrostatic gas bearing due to supply pressure oscillations

Wear, 1984
The vibration of a statically loaded, inherently compensated hydrostatic journal bearing due to oscillating supply pressure is investigated. Both angular and radial vibration modes are analyzed. The time-dependent Reynolds equation governing the pressure distribution between the oscillating journal and the sleeve is solved numerically together with the
H.D. Branch, C.B. Watkins, I.E. Eronini
openaire   +1 more source