The main method is using the properties of the solutions of characteristic matrix equation.
主要的方法是利用矩阵差分方程的特征矩阵方程解的性质。
Discretization in angular coordinate is needed only and the global equation is a second order characteristic matrix equation.
该一维有限元列式只需对扇形区域在角度方向上离散，最后的总体方程为一个二次特征根方程。
The stiffness matrix corrected by the method not only satisfies the characteristic equation, but also is the unique symmetric positive semidefinite matrix.
用这个方法修正的刚度矩阵不仅满足特征方程，而且是唯一的对称半正定矩阵。
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