A Hero-Jet Driven Porous Spherical Hydrostatic Gas Bearing Gyro

[+] Author and Article Information
A. L. Gu, J. A. Walowit, D. F. Wilcock

Research and Development Division, Mechanical Technology Inc., Latham, N. Y.

J. of Lubrication Tech 95(4), 490-498 (Oct 01, 1973) (9 pages) doi:10.1115/1.3451863 History: Received July 12, 1972; Online October 18, 2010


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 the bearing and maintain a constant speed. Analysis has been presented for predicting equilibrium speed, flow rates, and stiffness for axisymmetric condition as a function of various dimensionless system parameters representing porosity, drive nozzles, inlet feeding holes, supply pressure, etc. Effects of the various system parameters on the performance of the gyro are illustrated. A preliminary feasibility study has been made for a wide angle and a narrow angle bearing. It is found that the small angle bearing is less subject to lock-up without significant loss of stiffness, but suffers from a lower speed and a less efficient gas utilization. A particular design will represent a compromise between stiffness and speed.

Copyright © 1973 by ASME
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