The influence of nonlinear factors on the dynamic behavior of the powertrain torsional damper is studied by using the average method. First, the structure and working principle of dual mass flywheel are analyzed, and the nonlinear dynamic model of dual mass flywheel is established. Then the frequency response curve is obtained by the average method, and the accuracy of the solution is verified by the RK4 method. Finally, the effect of the parameters of dual mass flywheel on the amplitude–frequency characteristics is studied. The results show that the average method is suitable for the nonlinear vibration analysis of the dual mass flywheel, and the amplitude–frequency characteristic curve of the system has the characteristics of turning to the high frequency at the segment. Reducing the excitation amplitude, increasing the viscous damping, or increasing the Coulomb friction damping can effectively reduce the resonance peak value of the dual mass flywheel, and increasing the angular clearance is beneficial to further reduce the resonance frequency of the dual mass flywheel.

采用平均法研究了非线性因素对动力总成扭力阻尼器动力特性的影响。首先，分析了双质量飞轮的结构和工作原理，建立了双质量飞轮的非线性动力学模型。然后通过平均值法获得频率响应曲线，并通过RK4方法验证解的准确性。最后，研究了双质量飞轮参数对振幅-频率特性的影响。结果表明，平均法适用于双质量飞轮的非线性振动分析，系统的幅频特性曲线具有在分段处转向高频的特性。减小激励幅度，增加粘性阻尼，