This paper presents a method for estimating Coulomb and viscous friction coefficients from responses of a harmonically excited dual-damped oscillator with linear stiffness. The identification method is based on existing analytical solutions of non-sticking responses excited near resonance. The method is applicable if the damping ratio of viscous component can be considered small. The Coulomb and viscous friction parameters can be extracted from two or more input-output amplitude pairs at resonance. The method is tested numerically and experimentally. Experimental results are cross checked with estimations from free-vibration decrements and also from friction measurements.
Identifying Coulomb and Viscous Friction in Forced Dual-Damped Oscillators
Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 2002; Revised June 2003. Associate Editor: J.A. Wickert.
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Liang, J., and Feeny, B. F. (February 26, 2004). "Identifying Coulomb and Viscous Friction in Forced Dual-Damped Oscillators ." ASME. J. Vib. Acoust. January 2004; 126(1): 118–125. https://doi.org/10.1115/1.1640356
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