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针对固定界面子结构模态综合法经过变换组集后的整体结构动力学方程的队数必须包含所有子结构间界面节点的自由度数，如果界面的节点自由度数很大，必然造成整体方程也很庞大，给计算带来困难的不足，提出了如下解决方案：将所有界面节点作为一个广义子结构，对该子结构也像其它子结构一样，进行模态分析，取其前若干个模态作为保留主模态．这样，由于这个广义子结构的保留主模态数可以远小于其自由度数，组集后的整体方程的阶数就可以大大减小
For the fixed interface substructure modal synthesis method, the number of the whole structural dynamic equations after transformation grouping must include the number of degrees of freedom of the interface nodes between all substructures. If the number of degrees of freedom of the interface nodes is large, the overall equation will inevitably cause Due to its huge size and difficulty in computing, the following solution is proposed: All interface nodes are treated as a generalized substructure. The substructure is also subjected to modal analysis like other substructures, taking the former modalities as Keep the main modality. In this way, since the number of retained principal modalities of this generalized substructure can be much smaller than the number of degrees of freedom, the order of the global equation after grouping can be greatly reduced.