“力线”模型在机械波能量传播中的应用——以大学物理课程为例

Application of“Force Line”Model in Mechanical Wave Energy Transmission——Take College Physics Course as a Example

为形象呈现机械波能量的传播特征,类比电磁场中的"力线",建立了"波射线"模型.用波射线空间密度的变化表示机械波能量的传播特征,在物理图像上直观、易懂,很好地阐释了机械波能量的传播本质.并且在前期教学过程中,学生已掌握电磁场能量空间分布规律,利于理解这一物理过程,降低了学习的难度.

In order to visualize the transmissional characteristics of mechanical wave energy,the“line of force”in the electromagnetic field is analogized,and a“wave ray”model is established.The change in the spatial density of the wave ray is used to express the transmissional characteristics of mechanical wave energy,which is intuitive,easy to understand on the physical image and a good explanation of the nature of the transmission of mechanical wave ener⁃gy.And in the early teaching process,students have mastered the spatial distribution of electromagnetic field energy,which is conducive to understanding this physical process and reduces the difficulty of learning.