elastic-vibration

代码说明：

  客观现实的另一类力学模型是弹性体(也称连续系统或分布参数系统)，它的物理参数是分布型的，具有无限多个自由度，且运动规律由偏微分方程来确定(Another kind of objective reality mechanical model is elastomer (also called the continuous system or distributed parameter systems), its physical parameter is the distribution model, with an infinite multiple degrees of freedom, and movement rules by partial differential equations to determine )