建立某款全地形车车架挂发动机有限元模型,计算并进行模态分析.通过与实验模态分析结果对比,验证有限元模型的可靠性.在此基础上,分析路面激励及发动机激励与车体动态特性的匹配关系.为改善该款全地形车车体的动态特性,应用形状优化方法,以发动机在车架的前后、左右、上下安装位置及俯仰角度为变量,以提高车体一阶模态频率为目标,进行优化.根据优化结果,调整发动机的安装位置与俯仰角度,使车体的一阶模态频率提高5Hz.%The finite element model of all-terrain vehicle (ATV) frame with a mounted engine was established, and its computational modal analysis was conducted. According to the comparison of computational data with experimental data, it was proved that the finite element model is reliable. The matching relations between the ATV bodywork and the excitations from engine and road were analyzed. Then, shape optimization method was used to improve the dynamic characteristics of ATV bodywork. For optimization, the location and pitch angle of the engine on the frame were taken as the variables, and the first modal frequency of the bodywork was taken as the objective. By means of adjusting the location and pitch angle of the engine according to the optimization result, the first modal frequency of ATV bodywork was increased by 5 Hz.
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