Dual mass flywheel can decrease the torsional vibration of vehicle power transmission system under idling condition and normal speed driving condition. The first order and second order vibration model were built based on the multi-mass torsinoal system of dual mass flywheel and transmission under the idling condition. The relationship among rotary inertia, idling state torsional stiffness and nature frequency is derived from the two models. According to dual mass flywheel principle, the determination method of rotary inertia distribution of dual mass flywheel and the idling state torsional stiffness are pro- posed. Under driving condition, the relationship among driving state torsional stiffness, maximum torque of engine and idling state torsional stiffness is derived from the working principle, and the optimization method of driving state torsional stiffness was built for avoiding main order torsional vibration under low speed and normal speed driving condition. Torsional vibration test verifies the model correctness and de- sign method. Under the idling condition, the first nature frequency is reduced to 7.9 Hz and rotational speed fluctuation of engine is decreased by 80% using the dual mass flywheel under driving condition.%双质量飞轮用于降低汽车传动系统怠速工况和常速行驶工况下的扭转振动．在怠速工况下发动机、双质量飞轮与传动系统组成的多质量扭振模型的基础上，建立了双质量飞轮第1、2阶设计模型，并推导出双质量飞轮转动惯量、怠速级扭转刚度与系统固有频率的关系，结合减振原理，建立了其转动惯量分配和怠速级扭转刚度的设计方法；根据双质量飞轮的工作原理，推导出行驶级扭转刚度与发动机最大转矩、怠速级扭转刚度的关系，并以避免低速区和常速区动力传动系统发生主谐次扭转振动为目标，建立了多级扭转刚度的设计与优化方法．发动机的扭振试验验证了设计模型和设计方法的正确性，怠速工况下第1阶固有频率降至7．9Hz，行驶工况下双质量飞轮对发动机速度波动衰减了80％左右．
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