Study of dual-mass dynamic vibration absorber with negative-stiffness interaction between masses

An interaction through a negative-stiffness spring is introduced into a dual-mass dynamic vibration absorber (DVA) to lower its resonance frequency. DVA is one of the practical vibration control devices. In principles, it consists of an absorption mass and a spring. It can eliminate vibration at a specified frequency that equals the resonance frequency of the DVA. To eliminate low-frequency vibration, it is necessary to increase the absorption mass or lower the spring constant. The former method increases the size of the device and the latter method may cause difficulty in supporting the absorption mass. Although there are reports on the optimal design and robust optimal design of DVAs, there are few reports that focus on lowering the anti-resonance frequency. In addition, there are few studies on the parallel dual-mass DVA that has interference between the vibration absorption masses. This work focuses on parallel dual-mass DVA and proposes to insert a negative spring between the absorption masses. It is analytically shown that one of the resonance frequencies of the DVA can be set lower than that of the conventional DVA. Such characteristics are confirmed by numerical analyses and experiments.