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基于SAP5结构分析程序的板壳单元，推导了结构固有振动频率的一阶摄动量公式。通过改变板壳单元厚度，模拟动力装置中离合器壳两端螺栓连接部分的建模误差，修正了动力装置弯曲振动分析的有限元模型。
Based on the shell element of SAP5 structural analysis program, the first-order perturbation formula of natural frequency of structure is deduced. By changing the thickness of the shell element, the modeling error of the bolt connecting part at both ends of the clutch shell in the power plant was simulated, and the finite element model of the bending vibration analysis of the power plant was corrected.