Title: Vibration control by a hybrid dynamic absorber.
Abstract: This paper proposes a new hybrid dynamic absorber that combines an electro-magnetic actuator with a magnetic-damping-type dynamic absorber and shows its vibration controlling performances. Although the passive dynamic absorber with optimum adjustment conditions is able to control vibration well, the controlling effectiveness deteriorates markedly when these adjustment conditions fail. On the contrary, the active dynamic absorber expends a lot of energy for controlling vibration, instead of obtaining good control performance and robustness of control. In this paper, it is demonstrated theoretically and experimentally that the hybrid dynamic absorber has the advantages of both passive and active dynamic absorbers.