基于功率流的瞬态响应分析及能量波的可视化研究

Transient response analysis based on the power flow and the visualization of energy wave

以钢球和钢块的碰撞作为模型,基于有限元的功率流理论研究了碰撞的瞬态响应。对瞬态响应实现了钢球和钢块碰撞功率流云图及矢量图的可视化,并绘制出了碰撞瞬态响应的时间历程功率流云图及功率流矢量图,从而快速而准确地获得结构体能量在传递过程中任一时刻的大小和方向;提出了弹性体内部能量波的概念,并通过与经典的应力波分析比较说明:基于能量波的功率流云图比应力云图更明显的显示出碰撞过程中的无旋波和等容波,即能量波比应力波更能表现出结构内部的波动性。最后分析了钢球和钢块碰撞时的接触力及碰撞过程中的能量守恒。

Study the transient response due to a collision based on the theory of power flow finite element method with the collision model consisting of a steel ball and a steel block. Realize the visualization of power nephogram and power vectorgraph for the transient response . And draw out the power nephogram animation and vectorgraph animation for the transient response in the process of collision to obtain the magnitude and direction of energy transmission quickly and accurately at any moment in the structure body. Put forward a concept of energy wave in the elastomer. Through comparing with the stress wave, it is verified that the power nephogram is more obvious than the stress nephogram in showing the irrotational wave and shear wave in the process of collision. That is to say, the energy wave is better than the stress wave in showing the volatility in the elastomer. Analyse the contact force and energy conservation in the process of collision in the end.