Study On Vibration Of Wet-Clutch At High Rotating Speed

It is proved by the experiment that when the wet-clutch rolled with no load at a speed bigger than its critical speed, the fiction plates inside it intensely vibrated and heated up because of the flow-induced vibration caused by the pressure on the fiction plates from lubricant oil and air, which will shorten the service life of the wet-clutch. Aiming to resolve the problem of flow-induced vibration, this paper experimented on a vehicle wet-clutch, the characters of which was analyzed theoretically, simulated and experimented while the wetclutch was rolling with no load.Relevant parameters of vibration system of the friction plates when the wet-clutch was rolling at a high speed have been analyzed. Stiffness and damping of fluid was calculated through the calculation of fluid pressure and the lift and resistance on the friction plates. Dynamics computing methods were established to predict the critical speed at which flowinduced vibration would happen to a friction plate under the stiffness and damping and boundary conditions and in the meanwhile to predict the drag torque model for the friction plates at high speed area. Effective methods to reduce the vibration were put forward by working out the accelerated speed and amplitude of the vibration and were verified by the experiment.The established governing equations of the friction plates and the fluid were coupled to deduce a fluid-solid coupling equation for the friction plates in a wet-clutch. The coupling equation was studied in the physical significance and solved through complex-mode analysis. Simulation analysis on friction plate system is set up by method of bidirectional fluidstructure interaction.Factors affecting critical speed were discussed systematically and effect laws were researched. It is significant for the design and use of wet clutch to put forward measures to reduce vibration and increase the critical speed.