1. MOE Key Lab of Impact and Safety Engineering, Ningbo University, Ningbo 315211, China；
2. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Hong Kong 999077, China
Abstract：As a kind of typical structural unit, after impacting against a rigid-wall, a thin-walled ring’s coefficient of restitution (COR) is significantly less than 1 under the condition of its full elasticity. The processes of the elastic ring impacting against the rigid-wall under different working conditions were analyzed numerically. The results showed that the ring’s COR is mainly concentrated within 0.76 ~ 0.8, this COR is more smaller under a certain working conditions. Then elastic ring was equivalent to a curved beam. A micro-element analysis was done for the curved beam. Combined with equilibrium equations and geometric equations, the ring’s vibration modal shapes and modal frequencies were solved. Combining with the numerical simulation results, is was shown that within a certain range of material parameters and impacting velocity, the full elastic ring mainly presents its 1st order translation mode and 2nd order free vibration mode in the process of its impacting against a rigid-wall, its COR keeps approximately a constant value.
李凤云1，吴志鹏1，郑宇轩1，周风华1，余同希1,2. 弹性圆环在刚壁上的撞击回弹[J]. 振动与冲击, 2018, 37(11): 12-17.
LI Fengyun 1 WU Zhipeng 1 ZHENG Yuxuan 1 ZHOU Fenghua 1 YU Tongxi1,2. An elastic ring impacting against a rigid wall and rebounding. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(11): 12-17.
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