Quasi-optimal design of a parallel-type double-mass dynamic vibration absorber equipped with a damped primary system

(Accuracy of an H_∞-based optimal solution when two dynamic absorber masses are equal)

Abstract

Multiplexing dynamic vibration absorbers (DVAs) provide better vibration control force compared to that obtained with classical single-mass DVAs. In fact, previous studies have shown that the vibration suppression performance of double-mass DVAs is superior to that of the single-mass DVAs. In the optimal design of a parallel-type double-mass DVA, five dimensionless design parameters must be optimized. One of them is the mass ratio of two DVAs arranged in parallel. However, in many cases, especially in the parallel-type, the mass ratio of two DVAs cannot be set to the optimal value, because existing structures and machine parts are sometimes used as DVAs. In this report, I investigated how the optimal values of other design parameters change when the two DVA masses are set equal, and finally, how bad the vibration suppression performance of DVA becomes.