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RESEARCH PAPERS

Transient and Steady State Vibration Analysis of a Wavy Thrust Bearing

[+] Author and Article Information
H. Zhao

 Copeland Corporation, Sidney, OH 45365

F. K. Choy1

Department of Mechanical Engineering, The University of Akron, Akron, OH 44325-3903fchoy@uakron.edu

M. J. Braun

Department of Mechanical Engineering, The University of Akron, Akron, OH 44325-3903

1

Author to whom correspondence should be addressed.

J. Tribol 128(1), 139-145 (Jun 22, 2005) (7 pages) doi:10.1115/1.2033900 History: Received June 10, 2005; Revised June 22, 2005

This paper describes a numerical procedure for analyzing the dynamics of transient and steady state vibrations in a wavy thrust bearing. The major effects of the wavy geometry and the operating parameters on the dynamic characteristics of the bearing had been discussed in a previous paper; the present paper thus concentrates on examining the relationships between the development of the transient and steady state vibrations when operating conditions are parametrically varied. Special attention is given to the development of steady state vibrations from initial transients with comparisons and consequences to the overall system stability. Numerical based vibration signature analysis procedures are then used to identify and quantify the transient vibrations. The conclusions provide general indicators for designing wavy thrust bearings that are less susceptible to transients induced by external perturbations.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Configuration and coordinates of the wavy thrust bearing

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Figure 2

Stiffness coefficients of the wavy thrust bearing

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Figure 3

Damping coefficients of the wavy thrust bearing

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Figure 4

Stability analysis of the wavy thrust bearing using logarithmic decrement

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Figure 5

Linear and nonlinear transient response of wavy thrust bearing. (a) F=4.19kN (point A in Fig. 4) (R0=50.8mm, r0=38.1mm, Λ=684, g=6.35μm, Ix=Iy=3.1e−3kgm2, m=12.043kg), (b) F=1.47kN (point B in Fig. 4) (R0=50.8mm, r0=38.1mm, Λ=684,g=6.35μm, Ix=Iy=3.1e−3kgm2,m=12.043kg), and (c) Λ=855 (point C in Fig. 4) (R0=50.8mm,r0=38.1mm, Fload=2.096kN,r=1.27mm, θ=0deg, g=6.35μm, Ix=Iy=3.1e−3kgm2,m=12.043kg).

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Figure 6

Linear and nonlinear response functions for point A

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Figure 7

Linear and nonlinear response functions for point B

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Figure 8

Linear and nonlinear response functions for point C

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Figure 9

Relationships of peak amplitudes of response functions with system stability

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