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TECHNICAL PAPERS

Numerical Study of Some Nonlinear Dynamics of a Rotor Supported on a Three-Pad Tilting Pad Journal Bearing (TPJB)

[+] Author and Article Information
Issam Abu-Mahfouz

Penn State University at Harrisburg, School of Science, Engineering and Technology, Mechanical Engineering Technology, 777 West Harrisburg Pike, Room W-255-O Olmsted Building, Middletown, Pennsylvania 17057, USA

Maurice L. Adams

Department of Mechanical and Aerospace Engineering, Case School of Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA

J. Vib. Acoust 127(3), 262-272 (Jun 01, 2005) (11 pages) doi:10.1115/1.1888593 History: Received March 13, 2002; Revised January 26, 2005; Online May 18, 2005

Abstract

The use of tilting pad journal bearings (TPJBs) has increased in the recent past due to their stabilizing effects on the rotor bearing system. However, in this paper two mechanisms capable of producing instabilities in terms of subharmonic and chaotic motions are suggested. The first one is that of a centrally loaded pad with rotor unbalance excitations. The second one represents a concentric rotor (or a vertical rotor) acted upon by centering sprigs and large unbalance excitations. Extensive numerical experimentation shows, for certain parameters, subharmonic, quasi-periodic, and chaotic motions. The pad state space trajectory, in many cases, resembles that of the two-well potential case as in Duffing’s oscillator. Time trajectories, Poincare maps, fast Fourier transform (FFT) plots, and the max Lyapunov exponent are utilized to examine the periodicity (order) of the nonsynchronous rotor orbits and pad trajectories. The TPJB problem belongs to a family of nonlinear rotor-dynamical phenomena that are potentially of a considerable value as diagnostic tools in assessing rotating machinery condition monitoring.

Copyright © 2005 by American Society of Mechanical Engineers
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