高速多片湿式离合器带排转矩预测模型

车用高速多片湿式离合器摩擦副的流固耦合运动会引起摩擦片与钢片的轴向碰摩，使其产生较大的带排转矩，降低车辆传动系统工作效率.考虑摩擦副与间隙旋转流场之间的耦合运动关系，建立了摩擦副流固耦合动力学模型.分析了摩擦片与钢片碰摩过程，构建了摩擦副轴向碰摩模型，进而求得带排转矩.通过数值模拟研究了不同转速下的摩擦副非线性运动响应和带排转矩，并与实验结果进行对比.研究结果表明，随离合器转速的增加，在某一临界转速，摩擦副间发生轴向碰摩，摩擦副由稳定运动状态转变为混沌运动状态，此后离合器带排转矩随离合器转速的增加而逐渐增大.

Drag Torque Prediction Model for High Speed Multi-Disc Wet Clutch

The fluid-solid coupling motion of friction pairs in the high speed multi-disk wet clutch of the vehicle usually causes axial rub-impact between the friction plate and the steel plate, which leads to the drag torque of the friction pairs and decreases the efficiency of the vehicle transmission system. First, the coupling between friction pairs and rotating flow field was considered, and a fluid solid coupling dynamic model of friction pairs was established. Then, analyzing the rub-impacting process of friction plate and steel plate, an axial rub-impacting model was constructed to get the drag torque. Finally, the nonlinear motion response and the drag torque of the friction pairs at different rotational speeds were studied by numerical simulation, and the results were compared with the experimental results. The results show that with the increase of the speed of the clutch, axial rub-impact occurs at a critical speed, and the friction pairs change from stable state to chaotic motion state, and then the drag torque increases with the increases of the clutch speed.