Conventional impact damping features elastic deformation and momemtum exchange, in which most of vibration energy can not be exhausted but reverberated among impact partners. In a new fine particle impact damping (FPID), the plastic deformation of fine particles is introduced to the impact damping as an irreversible energy sink. In this paper, a theoretical model of FPID is set up to capture the complex physics involved in FPID, including the energy dissipation due to plastic deformation of fine particles as damping agent. The results from the simulations on a cantilever beam damped by FPID are consistent with the experimental results. It's concluded that the FPID can exhaust large amount of the vibration energy and works well in low frequency vibration, which is absent to conventional particle impact damping.
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