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1·By using the orthogonality condition of augmented eigenvector of multibody system, the algebraic equation group with unknowns of structure parameter is formed.

利用多体系统增广特征矢量的正交性条件，可建立以系统物理参数为未知数的代数方程组。

2·The proof of its unconditionally stable requires no damping matrix to satisfying the condition of the orthogonality of modes.

法的无条件稳定性的证明，可不要求阻尼矩阵满足振型正交条件。