Experimental Study of Freely Alignable Journal Bearings—Part 2: Dynamic Characteristics

[+] Author and Article Information
Z. L Qiu, A. K. Tieu

Department of Mechanical Engineering, University of Wollongong, NSW 2500, Australia

J. Tribol 118(3), 503-508 (Jul 01, 1996) (6 pages) doi:10.1115/1.2831566 History: Received March 03, 1995; Revised July 04, 1995; Online January 24, 2008


The traditional harmonic excitation method was modified to estimate 16 dynamic force coefficients of two misaligned journal bearings. To avoid the effects of different running conditions on the estimated coefficients, two harmonic forces with different frequencies were excited on the rotor simultaneously and all data were acquired during one test run. The excitation forces and their displacement responses were transferred to the frequency domain in which eight linear (complex) equations are derived. All 16 bearing force coefficients can then be obtained by solving these simultaneous linear equations through one operation. Applicable experimental procedures and data processing techniques are presented. The force coefficients of two circular journal bearings with two axial grooves each are estimated and correlate well with theoretical values when misalignment is considered. Various experimental errors are discussed and the uncertainty in the estimated coefficients is analyzed.

Copyright © 1996 by The American Society of Mechanical Engineers
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