Abstract This study is aimed at exploring the effect of the structural parameters of a driveline system on its dynamic response, during the start-up process. For this purpose, a modular modeling method was proposed, based on the power flow and mechanical connections in the driveline. Moreover, a dynamic model of the driveline for vehicle start-up was established, taking into consideration the time-varying mesh stiffness, shaft stiffness, damping, and the variation of the wet clutch friction coefficient with the relative slipping speed. Modal analysis of the driveline system was performed, and the influence of time-varying mesh stiffness of the gear set on the natural frequency was analyzed. Furthermore, an engine constant start-up control strategy was adopted, and the start-up process of the vehicle was simulated. The simulation model was verified with the experiment data. A new evaluation indicator was proposed taking into consideration the phase difference and amplitude change, induced by the time-varying stiffness and the self-excited vibration in the system. Lastly, the influence of the structural parameters on the dynamic response of the driveline system, during start-up, was investigated.

中文翻译：

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传动系统启动过程模块化建模与动态响应分析

摘要 本研究旨在探讨传动系统的结构参数在启动过程中对其动态响应的影响。为此，基于动力传动系统中的功率流和机械连接，提出了一种模块化建模方法。此外，考虑了时变啮合刚度、轴刚度、阻尼以及湿式离合器摩擦系数随相对滑动速度的变化，建立了车辆启动传动系统的动力学模型。对传动系统进行模态分析，分析齿轮组时变啮合刚度对固有频率的影响。此外，采用发动机恒定启动控制策略，对车辆的启动过程进行仿真。仿真模型得到了实验数据的验证。考虑到系统中随时间变化的刚度和自激振动引起的相位差和幅度变化，提出了一种新的评估指标。最后，研究了在启动期间结构参数对传动系统动态响应的影响。