中文说明：应用背景利用有限元matlab计算轴的固有频率，可以快速的绘制振型，和ansys对比基本吻合。关键技术利用有限元，分别调用单元质量和刚度矩阵，然后组装矩阵，分别进行处理。
English Description：
Application backgroundUsing the finite element matlab to calculate the natural frequency of the shaft, it can quickly draw mode, and the ANSYS contrast to the basic.Key TechnologyUsing the finite element, the element mass and stiffness matrix are called respectively, and then the matrix is assembled.