The torsional vibration is often initiated by the momentary impact which occurs when a load is connected to a motor by several mechanical coupling parts. An industrial servo system is basically represented as a multi-mass system. To suppress the vibration generated in the two-mass load, many control methods have been developed for practical use. In this paper, however, the authors propose a simple vibration suppression strategy for the multi-mass system which employs two variable parameters consisting of resonance ratio and damping factor along with a state feedback approach. The excellent vibration suppression control, as an example, for a three-mass system, resulting in excellent vibration suppression even for a small resonant ratio, is verified by simulations and experiments.
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