Calculation and Measurement of the Stiffness and Damping Coefficients for a Low Impedance Hydrodynamic Bearing

[+] Author and Article Information
M. J. Goodwin, P. J. Ogrodnik, M. P. Roach, Y. Fang

School of Engineering, Staffordshire University, Beaconside, Stafford ST18 0AD, United Kingdom

J. Tribol 119(1), 57-63 (Jan 01, 1997) (7 pages) doi:10.1115/1.2832480 History: Received November 12, 1994; Revised January 29, 1996; Online January 24, 2008


This paper describes a combined theoretical and experimental investigation of the eight oil film stiffness and damping coefficients for a novel low impedance hydrodynamic bearing. The novel design incorporates a recess in the bearing surface which is connected to a standard commercial gas bag accumulator; this arrangement reduces the oil film dynamic stiffness and leads to improved machine response and stability. A finite difference method was used to solve Reynolds equation and yield the pressure distribution in the bearing oil film. Integration of the pressure profile then enabled the fluid film forces to be evaluated. A perturbation technique was used to determine the dynamic pressure components, and hence to determine the eight oil film stiffness and damping coefficients. Experimental data was obtained from a laboratory test rig in which a test bearing, floating on a rotating shaft, was excited by a multi-frequency force signal. Measurements of the resulting relative movement between bearing and journal enabled the oil film coefficients to be measured. The results of the work show good agreement between theoretical and experimental data, and indicate that the oil film impedance of the novel design is considerably lower than that of a conventional bearing.

Copyright © 1997 by The American Society of Mechanical Engineers
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