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The effects of Coulomb friction on the performance of centrifugal pendulum vibration absorbers

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Abstract

We investigate analytically and experimentally the effects of Coulomb friction on the performance of centrifugal pendulum vibration absorbers (CPVAs), which are used to reduce torsional vibrations in rotating machinery. The analysis is based on perturbation methods applied to the nonlinear equations of motion for a rotor subjected to an engine order applied torque and equipped with a circular path CPVA with viscous and Coulomb damping. The experimental work is based on quantifying parameters for the damping model using free vibration measurements with a viscous and Coulomb damping identification scheme that is enhanced to better handle measurement noise, and running tests for steady-state operation under a range of loading conditions. The level of Coulomb damping is varied by adjusting the friction of the absorber connection bearing. Good agreement is found between the analytical predictions and the experimental data. It is shown that the absorber sticks up to a level of excitation that allows it to release, after which the Coulomb damping acts in the expected manner, resulting in lowered response amplitudes. The results obtained are of general use in assessing absorber performance when dry friction is present in absorber suspensions.

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Correspondence to Brendan J. Vidmar.

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Vidmar, B.J., Feeny, B.F., Shaw, S.W. et al. The effects of Coulomb friction on the performance of centrifugal pendulum vibration absorbers. Nonlinear Dyn 69, 589–600 (2012). https://doi.org/10.1007/s11071-011-0289-7

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  • DOI: https://doi.org/10.1007/s11071-011-0289-7

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