Abstract
A tri-stable nonlinear energy sink (NES) with negative stiffness and positive piecewise linear stiffness is presented for broad band vibration suppression of small vibrations of host structural system. The negative stiffness of the NES is produced by permanent magnets and the piecewise linear stiffness is produced by a combination of elastic beams. The structure and the mechanism of the NES is firstly introduced, and then the dynamic model of the main system with the NES is built. The vibration suppression ability of the considered NES under transient and steady state excitations are numerically studied and experimentally verified. The results show that the proposed NES has efficient vibration suppression ability, the dissipating speed increases 6.89 times in transient vibration suppression and vibration suppression rate reaches to 71% in steady state vibration suppression. And also, the NES has the ability to attenuate vibrations less than 1 mm.
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