Research on the durability of particle impact dampers
LI Hai-chao1 , WANG Shu-lin2 , DU Yan-chen3 , LI Sheng-juan2 , XU Bo1 , Dunliang Jian2, ZHU Yu-fang2
1. School of Energy and Power Engineering , University of Shanghai for Science and Technology, Shanghai 200093 , China; 2. School of Materials Science and Engineering , University of Shanghai for Science and Technology, Shanghai 200093 , China; 3. School of Medical Instrumentation and Food Engineering , University of Shanghai for Science and Technology , Shanghai 200093, China
Abstract：As passive vibration absorber, particle impact damper performance will be influenced by the evolution of particles size and morphology during the impact process. This paper for the first time deals with the durability of the ball impact dampers with Zn particles of median diameter 35m as the damping agent in the container installed on a cantilever subjected to sinusoidal vibration within 96-hour impacting. We show that the response of the primary system is slightly increased three times in the period investigated. It may be ascribed to the change of the morphology and energy state of the Zn particles inside the absorber. With the impacts progressing, particles cold welding may occur which decreases the velocity of the impactor (the ball) and consequently the momentum exchange. On the other hand, the decreased strain energy and dislocation energy of the Zn particles could also reduce the irreversible energy consumption of the system. At the same time, particle size decreasing with working time makes the particles difficult to be further cloven. All these may reduce the irreversible energy consumption. That is why the cantilever response increases step by step with extended step length.
2013, Vol. 32 
