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 probability density evolution equation (PDEE) of the stochastic structural response is then established by introducing augmented state vector.