Influence of Mass Ratio on Sub-impact of Flexible Links
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摘要: 为了深入研究质量比和碰撞相对速度对柔性构件次碰撞现象的影响，搭建了球与柔性梁碰撞的试验模型。通过设计4种碰撞试验组合，并建立与试验结构尺寸1：1的有限元模型，对球-梁的次碰撞诱因展开了讨论。研究表明，有限元仿真方法可以准确的模拟次碰撞试验过程。试验结果如下：1）如果质量比不合适，碰撞相对速度的改变不会激发次碰撞现象；2）质量比处于激发次碰撞现象的临界值时，碰撞相对速度的改变将直接影响后续次碰撞的次数和形式。研究表明，质量比对激发次碰撞行为起到主导作用，该结果可作为控制柔性构件次碰撞次数的参考。Abstract: In order to study the influence of the mass ratio and the relative velocity of impact on the sub-impacts of flexible links, an experimental model for ball impact flexible beam was set up. By designing four kind experimental combinations of the ball impact beam and establishing the finite element model for experimental structure size 1:1, the sub-impacts inducements of a ball impact beam was studied. The study showed that the finite element method could accurately simulate the sub-impact experiment process, and then combined with the experimental results. The following conclusions were obtained:1) if the mass ratio is not suitable, the change in relative velocity of impact will not excite the sub-impacts phenomenon; 2) when the mass ratio is in the critical value of the sub-impacts phenomenon, the change in relative velocity of impact will directly affect the number and form of the sub-impacts. According to the present study, the mass ratio plays a leading role in the sub-impacts inducements, the results can be used as reference for controlling the number of sub-impacts of flexible links.
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Key words:
- flexible links /
- sub-impacts /
- mass ratio /
- relative velocity of impact
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