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Research Papers: Hydrodynamic Lubrication

Analysis on Dynamic Performance of Hydrodynamic Tilting-Pad Gas Bearings Using Partial Derivative Method

[+] Author and Article Information
Yang Lihua, Qi Shemiao

Institute of Mechatronics and Information Systems, Key Laboratory of Ministry of Education for Strength and Vibration, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China

Yu Lie1

Institute of Mechatronics and Information Systems, Key Laboratory of Ministry of Education for Strength and Vibration, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, Chinayulie@mail.xjtu.edu.cn

1

Corresponding author.

J. Tribol 131(1), 011703 (Dec 02, 2008) (8 pages) doi:10.1115/1.2991232 History: Received January 18, 2008; Revised August 01, 2008; Published December 02, 2008

Tilting-pad gas bearings are widely used in high-speed rotating machines due to their inherent stability characteristics. This paper advances the analytical method for prediction of the dynamic performances of tilting-pad gas bearings. The main advantage of the analytical method is that the complete set of dynamic coefficients of tilting-pad gas bearings can be obtained. The predictions show that the perturbation frequency has the strong effects on the dynamic coefficients of gas bearings. In general, at lower perturbation frequency, the equivalent direct stiffness coefficients increase with frequency, whereas equivalent direct damping coefficients dramatically reduce. For higher perturbation frequency, the dynamic coefficients are nearly independent of the frequency. Moreover, the equivalent dynamic coefficients of four-pad tilting-pad gas bearing obtained by the method in this paper are in good agreement with those obtained by Zhu and San Andres [(2007), “Rotordynamic Performance of Flexure Pivot Hydrostatic Gas Bearings for Oil-Free Turbomachinery  ,” ASME J. Eng. Gas Turbines Power, 129(4), pp. 1020–1027] in the published paper. The results validate the feasibility of the method presented in this paper in calculating the dynamic coefficients of gas-lubricated tilting-pad bearings.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Position of the journal at the arbitrary perturbation of the journal

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Figure 2

Schematic of tilting-pad journal bearing with three pads

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Figure 3

Changes of the equivalent dynamic stiffness and damping coefficients with the perturbation frequency of the journal and pads for Λ=3.0 and m=0.0

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Figure 4

Changes of the dynamic stiffness and damping coefficients of the pads with the perturbation frequency for Λ=3.0 and m=0.0

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Figure 5

Effect of perturbation frequency on predicted dynamic coefficients of the bearing model in Ref. 5

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