Based on modal perturbation method, a new approach is developed for solving the random seismic response of horizontal layered soil.
基于模态摄动方法，提出了层状土层随机地震反应的近似分析方法。
The modal superposition method is often used for computing the Perturbation of eigenvectors in the modification for structural and correCtion for model.
模态展开法是计算特征向量摄动量的常用方法之一，但当高阶模态被截断时。
The direct modal perturbation based on selecting point by number-theoretic method is proposed to find the random response of un-damping linear random structures.
针对于多自由度线性复合随机结构的随机自振特性分析，提出了基于数论选点的直接模态摄动法。
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