A modified boundary element method is proposed. In the approach, the matrices in the formed boundary equation implicitly contain no eigen parameter.
本文提出一种改进边界元法，它使形成的边界元方程不隐含本征量，避免大阶数矩阵的转置。
2
Stiffness matrix and load vector were founded on developing eigen-equation for wall element and applying principle of virtual work.
通过推导单元特征方程的解及应用虚功原理，建立了墙元的刚度矩阵和荷载向量。
3
In this paper, the component mode synthesis, combined with the perturbation and stochastic finite element, is used to study the random eigen problem of large and complicated structures.