Proposal of Dual-Mass Dynamic Vibration Absorber Using Negative Stiffness

Abstract

One of the practical vibration control devices is dynamic vibration absorber (DVA). In principles it consists of an absorption mass and a spring. It can eliminate vibration at a specified frequency that equals the resonant frequency of 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. Therefore, a new device is required to suppress low frequency vibration effectively. This work proposes to insert a negative spring between the vibration absorption masses in a parallel dual-mass DVA. It is shown that the anti-resonance frequency can be set lower than that of the original DVA with an interaction through negative stiffness.