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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Field Methods for Identification of Bearing Support Parameters—Part II: Identification From Rotor Dynamic Response due to Imbalances

[+] Author and Article Information
Oscar C. De Santiago

 Dresser-Rand Company, Olean, NY 14760desantiago@dresser-rand.com

Luis San Andrés

 Texas A&M University, College Station, TX 77843-3123lsanandres@mengr.tamu.edu

Tilting pad bearings show frequency dependent force coefficients. Presently, the force coefficients are obtained at a frequency coinciding with rotor speed, i.e., synchronous.

J. Eng. Gas Turbines Power 129(1), 213-219 (Mar 01, 2003) (7 pages) doi:10.1115/1.2227034 History: Received October 01, 2002; Revised March 01, 2003

This paper describes a procedure suitable for field implementation that allows identification of synchronous bearing support parameters (force coefficients) from recorded rotor responses to imbalance. The experimental validation is conducted on a test rotor supported on two dissimilar bearing supports, both mechanically complex, each comprising a hydrodynamic film bearing in series with a squeeze film damper and elastic support structure. The identification procedure requires a minimum of two different imbalance distributions for identification of force coefficients from the two bearing supports. Presently, the test rotor responses show minimal cross-coupling effects, as also predicted by analysis, and the identification procedure disregards cross-coupled force coefficients thereby reducing its sensitivity to small variations in the measured response. The procedure renders satisfactory force coefficients in the speed range between 1500 and 3500rpm, enclosing the rotor-bearing system first critical speed. The identified direct force coefficients are in accordance with those derived from the impact load excitations presented in a companion paper.

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Copyright © 2007 by American Society of Mechanical Engineers
Topics: Force , Bearings , Rotors , Dampers
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Figures

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Figure 1

Test rig for measurements of imbalance response of rotor supported on hydrodynamic bearings and squeeze film dampers

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Figure 2

Series supports composed of squeeze film damper and fluid film bearing used for equivalent parameter identification

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Figure 3

Rotordynamic response of test rotor to calibrated imbalances. (a) Synchronous response amplitudes; (b) phase angle of response.

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Figure 4

Equivalent, synchronous force coefficients of test series damper-bearing support identified from imbalance response measurements. (a) Support: plain journal bearing and cylindrical SFD. (b) Tilting pad bearing and integral SFD. Identification reliable on speed range 2–3krpm.

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