【摘要】 为汽车传动系统扭振的建模与仿真，本文中提出了一种扭振激励的辨识方法。首先，通过实车道路试验，获得了样车加速工况的传动系扭振数据；然后，为研究和预测样车的扭振特性，建立了传动系统4自由度非线性动力学模型，同时提出了一种缸压曲线的拟合函数，并通过参数辨识得到缸压曲线的估计，从而获得激励转矩；接着，对模型进行数值仿真并与试验结果对比，验证了模型的准确性；最后，通过调整离合器和半轴的刚度，以及在传动轴加装惯量盘，将传动系固有频率移到了常用转速外，避免了扭转共振。结果表明：基于函数拟合的缸压曲线辨识方法可有效辨识传动系扭振的激励，仿真精度较高，为该类问题的研究提供了理论支持。更多还原

【Abstract】 For the modeling and simulation of the torsional vibration of automotive driveline system,an identification method of torsional vibration excitation is proposed in this paper. Firstly,a real vehicle test is conducted to obtain the torsional vibration data of the sample vehicle during acceleration. Then,a 4-DOF nonlinear dynamic model is established for studying and predicting the torsional vibration characteristics of the sample vehicle. Meanwhile,a fitting function of the cylinder pressure curve is put forward,and an estimation of cylinder pressure curve is obtained through parameter identification,so the excitation torque is acquired. Next,a numerical simulation is performed on the model with its results compared with test data,verifying the correctness of the model. Finally,through the adjustment of the stiffness of clutch damper and the half shaft and the installation of an inertia plate on propeller shaft,the natural frequency of the driveline system is shifted beyond the commonly-used speeds,avoiding the resonation of torsional vibration. The results show that the function fitting-based cylinder pressure curve identification method can effectively identify the excitation of the torsional vibration of driveline system with high accuracy,providing theoretical support for the research on driveline torsional vibration.更多还原