本文把Ritz 向量直接迭加法同静力子结构相结合,不形成也不存贮总体刚度、质量矩阵,使动力分析在子结构的层次上进行,降低了对计算机内存容量的要求。本方法在有限元和Ritz向量直接迭加法的基础上,没有引入新的假设,因此,比起传统的求解大型结构固有振动的模态综合法来精度是有保证的。 In this paper, the Ritz vector direct superposition method is combined with the static sub-structure, without forming or storing the overall stiffness and mass matrix, so that the dynamic analysis is performed at the sub-structure level, reducing the requirement on the computer memory capacity. This method does not introduce any new assumptions based on the direct superposition of finite element and Ritz vectors. Therefore, the accuracy is guaranteed compared with the traditional modal synthesis method for solving the inherent vibration of large structures.