关键词: 低频, 颗粒碰撞阻尼, 塑性变形, 振动控制

Abstract: Energy dissipation mechanisms of conventional impact damping (CID) are mainly momentum exchange and friction. During impact process a lot of vibration energy cannot be exhausted but reverberated among vibration partners. Besides, CID may produce additional vibration to the system or even amplify the response in lower frequency. To overcome these shortcomings, a new fine particle impact damping (NFPID) which introduces particle plastic deformation into impact damper as an irreversible energy dissipation mechanism is proposed to exhaust vibration energy. Experiments on a cantilevered beam with CID and NFPID are performed respectively. It is concluded that NFPID has excellent ability to absorb vibration energy than conventional impact damping. Furthermore, NFPID works well in vibrations under low frequency (lower than 50 Hz), which is absent to CID. NFPID has wide and bright prospect of application because most of mechanical vibrations are in low frequency.

Key words: Low frequency, Particle impact damping, Plastic deformation, Vibration control