Vibration control of actual operating machine by dynamic vibration absorber with frequency tuning mechanism using viscoelastic material

Abstract

This paper describes a dynamic vibration absorber (DVA) that can be easily adjusted to the frequency changes of host structure. Viscoelastic material (urethane rubber) is used as spring and damping elements in the DVA to support each side of a rectangular auxiliary mass made of iron, and the rubber can be compressed by bolts and iron plates. By changing the number of the rubber and the amount of compression, the supporting stiffness of the auxiliary mass can be changed and the natural frequency of the DVA can be adjusted. The DVA is applied to an actual host structure (a rotational machine testing equipment). The vibration characteristics of the DVA and the effectiveness of the frequency adjustment mechanism are investigated, and the results of the vibration control effect are reported.