中文摘要：

基于有限元法对裂纹损伤结构的功率流进行可视化研究。引入结构声强的概念，给出有限元壳单元和实体单元中结构声强的表达式。给出流线可视化的概念，并应用到结构声强流线的可视化中。利用1／4点单元法来模拟裂纹，计算得到了裂纹结构在不同裂纹参数和不同激励频率下的位移响应矢量图、声强矢量图和流线图。实现了结构表面能量分布、传播以及在裂纹位置周围的分布的可视化，为掌握振动能量在损伤结构的分布、损伤的识别提供了新的手段。

英文摘要：

Based on finite element method（FEM）, the visualization research on the power flow of cracked structure is implemented. The concept of structural intensity（SI） is introduced, the expressions of shell element and solid element in FEM are given. The concept of streamline visualization is given and applied to the visualization of the SI streamline. The plots of displacement vector, SI vector and SI streamline of cracked structure are obtained, which realizes the visualization of energy distribution, propagation on the surface of structure and around the crack, and provides a new tool to understand the distribution of energy in damaged structures and damage detection.