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TECHNICAL PAPERS

Wavelet Analysis of Stick-Slip Signals in Oscillators With Dry-Friction Contact

[+] Author and Article Information
Jin-Wei Liang

Department of Mechanical Engineering,  Ming-Chi University of Technology, Taipei, Taiwan, 24306, R.O.C.

Brian F. Feeny

Department of Mechanical Engineering,  Michigan State University, East Lansing, MI 48824-1226

J. Vib. Acoust 127(2), 139-143 (Jun 22, 2004) (5 pages) doi:10.1115/1.1891819 History: Received August 04, 2003; Revised June 22, 2004

Wavelet transforms were compared between various simulated friction models and real stick-slip data. While simulations of several models produced stick-slip transition oscillations seen in the real data, the wavelet features of the compliant contact model with light damping best captured the characteristics of the experimental signal. The wavelet contours were also used to estimate the contact stiffness.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental stick-slip signals (a) displacement, (b) velocity, (c) acceleration, and (d) friction force responses

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Figure 2

Wavelet analysis of the simulated stick-slip acceleration, Coulomb friction model: (a) time-domain response and (b) wavelet contour plot

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Figure 3

Wavelet analysis of the simulated stick-slip acceleration, state-variable friction model: (a) time-domain response and (b) wavelet contour plot

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Figure 4

A schematic diagram showing the massless compliant contact model

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Figure 5

Wavelet analysis of the simulated stick-slip acceleration, tangential contact model with heavier viscous damping (ζ=0.0558): (a) time-domain response and (b) wavelet contour plot

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Figure 6

Wavelet analysis of the simulated stick-slip acceleration, tangential contact mode with lighter viscous damping (ζ=0.0174): (a) time-domain response and (b) wavelet contour plot

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Figure 7

Wavelet analysis of the experimental stick-slip acceleration: (a) time-domain response and (b) wavelet contour plot

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