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本文分析了无界面子结构模态综合法计算结果的误差原因。根据该子结构的特点,提出了一种直接对组成 Ritz 减缩基的子结构低阶模态进行改良的修正方案(称为改进无界面法),定义了无界面补偿模态和补偿子结构。与原无界面法相比,改进无界面法增加少许计算量,不增加存贮量,并且可使结构减缩后的规模只为原来的10-30%,计算结果精度高。
This paper analyzes the error causes of the results of the modal synthesis method without interface substructure. According to the characteristics of the substructure, a modified scheme (improving the interfaceless method) for directly improving the lower-order modes of the substructures that make up the Ritz-reduced bases is proposed, and the interface-free compensation modes and compensation substructures are defined. Compared with the original interface-free method, the improved interface-free method increases the amount of calculation, does not increase the amount of memory, and can reduce the size of the structure only to the original 10-30%, and the accuracy of calculation results is high.