And the eigenvalue problem of integral equation is transformed into a standard eigenvalue problem of a matrix with infinite order.

进而将积分方程形式的特征值问题转化为无穷阶矩阵的标准特征值问题。

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And then the eigenvalue problem of integral equation is transformed into the standard eigenvalue problem of a positive definite matrix with infinite order.

进而将积分方程形式的特征值问题转化为无穷阶正定对称矩阵的标准特征值问题。

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Then the eigenvalue problem of free vibration of annular sector plates is transformed into the eigenvalue problem of integral equation by using superposition theorem.

然后由叠加原理将环扇形板的自由振动问题转化为积分方程特征值问题；

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