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采用SolidWorks软件建立车架三维模型,借助于ANSYS软件建立以体单元为基本单元的车架有限元模型。在此模型基础上,进行有限元静力学分析和模态分析,获得车架在弯曲工况和扭转工况下的最大等效应力和应变,以及其前10阶固有频率和振型。结果显示:电动巡逻车车架结构满足材料的强度和刚度要求,但其1阶固有频率和地面的激励频率接近,车架与外激励易产生共振,需采取措施提高车架低阶固有频率。对双主纵梁结构的车架进行模态分析,通过对比改进前后车架的低阶固有频率,为车架优化设计提供了理论指导。
SolidWorks software is used to build the three-dimensional model of the frame, and the finite element model of the frame with the body element as the basic unit is established by means of ANSYS software. Based on this model, the finite element static analysis and modal analysis are carried out to obtain the maximum equivalent stress and strain of the frame under bending and twisting conditions and the first 10 natural frequencies and modes. The results show that the structure of the electric patrol car frame meets the requirements of the strength and stiffness of the material. However, the natural frequency of the first order is close to the excitation frequency of the ground, and resonance easily occurs between the frame and the external excitation. The modal analysis of the frame with double main girder structure improves the low-order natural frequencies of the front and rear frames, which provides theoretical guidance for the frame optimization design.