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复合材料梁的准确动力学建模是后续振动响应分析和结构优化设计的基础。针对管状复合材料梁提出一种复合梁单元的有限元建模新方法。利用圆柱坐标系下管状梁的本构关系,采用复合梁单元建立系统的无阻尼有限元模型;利用模态实验结果辨识阻尼参数,得到系统的有阻尼振动模型。以某变压器中的连线杆为例进行仿真建模和模态分析,所建振动模型的模态频率和频率响应均与实验结果吻合较好,证明了所提建模方法的正确性和有效性。
The accurate dynamic modeling of composite beams is the basis for subsequent vibration response analysis and structural optimization design. A new finite element modeling method for composite beam elements is proposed for tubular composite beams. Based on the constitutive relation of the tubular beam in the cylindrical coordinate system, an undamped finite element model of the system is established by using the composite beam element. Damping parameters are identified by modal experimental results to obtain the damped vibration model of the system. Taking a connecting rod in a transformer as an example, the simulation modeling and modal analysis are carried out. The modal frequency and frequency response of the vibration model are in good agreement with the experimental results, which proves the correctness and effectiveness of the proposed modeling method Sex.