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上活塞和下活塞纵向撞击时,由于速度发生突然变化而产生冲击力,而冲击力的作用又不能立即传到上活塞体内的所有各部分。在开始时距离较远的部分保持不受扰动,而由力所引起的形变是以弹性波的形式在上活塞体内传播。下面就这个问题进行一些计算和讨论。
When the upper piston and the lower piston collide vertically, the impact force suddenly changes due to the speed and the impact force can not immediately reach all parts of the upper piston body. The part farther away from the beginning remains undisturbed and the deformation caused by the force propagates in the upper piston body in the form of an elastic wave. Here are some calculations and discussions on this issue.