Theory Versus Experiment for the Effects of Pressure Ratio on the Performance of an Orifice-Compensated Hybrid Bearing

[+] Author and Article Information
P. Mosher

Flowserve, Kalamazoo, Michigan

D. W. Childs

Jordan Professorship of Mechanical Engineering, Turbomachinery Laboratory, Texas A&M University, College Station, Texas

J. Vib. Acoust 120(4), 930-936 (Oct 01, 1998) (7 pages) doi:10.1115/1.2893922 History: Received November 01, 1995; Online February 26, 2008


This research investigates the effect of varying the concentric recess pressure ratio of hybrid (combination hydrostatic and hydrodynamic) bearings to be used in high-speed, high-pressure applications. Bearing flowrate, load capacity, torque, rotordynamic coefficients, and whirl frequency ratio are examined to determine the concentric, recess-pressure ratio which yields optimum bearing load capacity and dynamic stiffness. An analytical model, using two-dimensional bulk-flow Navier-Stokes equations and anchored by experimental test results, is used to examine bearing performance over a wide range of concentric recess pressure ratios. Typically, a concentric recess pressure ratio of 0.50 is used to obtain maximum bearing load capacity. This analysis reveals that theoretical optimum bearing performance occurs for a pressure ratio near 0.40, while experimental results indicate the optimum value to he somewhat higher than 0.45. This research demonstrates the ability to analytically investigate hybrid bearings and shows the need for more hybrid-bearing experimental data.

Copyright © 1998 by The American Society of Mechanical Engineers
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