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对立体空间旋转对称结构在液体中形成的耦合系统（ＣＮ系统）进行统一的群变换及界面协调，推导了对液体多级划分后的组合模态综合过程。进行子结构之间以及向上一级子结构的对接与缩聚，提出了旋转对称结构液－固耦合振动的多级杂交子结构法。完成了立体空间旋转对称结构完全液－固耦合动力特性的群分析。此方法使耦合系统的综合规模大为缩小，计算速度提高数倍。文中通过试验结果证实理论方法的正确性。
The unified group transformation and interface coordination of the coupling system (CN system) formed by rotating symmetry structure of three-dimensional space in liquid are deduced. The combined modal synthesis process after multi-level division of liquid is deduced. The docking and polycondensation of the substructures and the up-level substructures were carried out. A multi-level hybrid substructure method of liquid-solid coupling vibration was proposed. The group analysis of complete liquid-solid coupling dynamic characteristics of the rotationally symmetric structure in three-dimensional space is completed. This method greatly reduces the overall scale of the coupled system and increases the computational speed several times. The test results confirm the correctness of the theoretical method.