Abstract
The effect of Coulomb friction combined with viscous damping in a dynamic vibration absorber attached to the primary system with viscous damping subjected to the exciting force P0 sin ωt has already been clarified. This study is devoted itself to the same system as the above in another case, in which the primary system is subjected to the harmonic base excitation, u0 sin ωt. The analysis may be proceeded by replacing the amplitude of exciting force P0 in the previous report by a new apparent force, u0√(k21+(c1ω)2). The results of the numerical analysis are compared with those of the digital simulation (HITAC DDS III) with good coincidence. And, it is conclude that the existence of Coulomb friction in the absorber increases the amplitude of main mass and limits the non-stop motion within the narrow range of frequency. A set of empirical formulae for determining the optimum tuning and damping is constructed for the practical use.
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