This paper presents a detailed investigation about the effect of structural damping and modal truncation number on vehicle dynamic characteristics. Finite element method and experimental method are applied to research vehicle’s dynamic response. According to the real vehicle’s structure, the dynamic simulation model of vehicle is established by the substructure modeling method. In order to research the influence of different variables on vehicle’s dynamic responses, the control variable method is adopted. In other words, the parameters of structural damping and mode truncation number are changed respectively. Comparing the dynamic response results, the influence rules of structural damping and mode truncation number on dynamic responses are obtained. Results show that the dynamic responses of vehicle changes significantly with the change of structural damping and mode truncation number. The studying results provide important significance for the determination of parameters. As well as, the correctness and reliability of the analysis results are verified by the experimental method.

本文详细研究了结构阻尼和模态截断数对车辆动态特性的影响。应用有限元法和实验法研究车辆的动态响应。根据实际车辆结构，采用子结构建模方法建立车辆动力学仿真模型。为了研究不同变量对车辆动态响应的影响，采用控制变量法。换句话说，结构阻尼和模态截断数的参数分别改变。对比动力响应结果，得到结构阻尼和模态截断数对动力响应的影响规律。结果表明，随着结构阻尼和模态截断数的变化，车辆的动力响应发生显着变化。研究结果对参数的确定具有重要意义。并通过实验方法验证了分析结果的正确性和可靠性。