Finally a displacement generalized eigenvalue equation is obtained, in which the stiffness matrix is symmetric and positively definite.

最后得到一个矩阵型的位移广义本征值方程，刚度矩阵对称、正定。

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After the equation is set up, using the standard finite element program and subspace iteration algorithm to solve the generalized eigenvalue problem.

方程建立后，使用标准的有限元程序，采用子空间迭代算法来求解广义特征值问题。

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