Abstract
This report presents the effect of Coulomb friction combined with viscous damping in the main system to which a viscous-damped dynamic vibration absorber is attached. The main mass is excited by a rotating unbalance, and in the analysis, a similar process is used to that explained in the previous report(3). Thus, the conclusions are : - (1) The numerical results of analytical solution coincide very well with those of digital simulation. (2) Coulomb friction coexisting with the viscous damping in the main system, with a dynamic vibration absorber tuned so as to suppress the resonant response of the system in considering only viscous damping, reduces the maximum amplitudes of the main mass. The features of two equi-height maximums in the resonance curve vanish. (3) By reason that conventional expressions for the optimum tuning of the absorber do not fit in this case, other new empirical formulae are recommended.
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