Study On Torque And Dynamic Characteristics Of Dual-Mass Flywheel Damping Ring Based On Structure-Fluid Coupling

The traditional vibration damping method of the automobile drive train is to add a torsional shock absorber to the clutch driven disk,but the natural frequency of the drive train can not effectively avoid the excitation frequency band corresponding to the common speed of the engine so that the vibration damping effect is not ideal,and the dual-mass flywheel shock absorber compared with the traditional clutch shock absorber has increased torsion angle and arrangement radius,which greatly reduces the torsional rigidity,and can isolate the natural frequency of the automobile transmission system outside the frequency corresponding to the normal speed range of the engine.Compared with conventional clutch-type driven disc shock absorbers,it has a better damping effect.At present,it is difficult for the dual-mass flywheel to achieve a greater degree of suppression effect of torsional vibration by matching and adjusting the vibration damping spring rate and moment of inertia,and the nonlinear damping damping characteristics of the dual-mass flywheel can effectively suppress the torsional vibration of the automobile transmission system.In this paper,a damping ring is introduced into the dual-mass flywheel,a convex cylindrical array distribution structure is constructed on the surface of the damping ring,grease is stored between each cylinder,and a preload is applied in the axial direction,so that when the system vibration is strong,a large torque action is generated under the interaction with the primary flywheel,secondary flywheel and lubricating medium to achieve the purpose of rapid attenuation of vibration.The influence of conformal contact deformation with the primary flywheel on the vibration damping performance of the dual-mass flywheel was studied.A test scheme was proposed,and the dynamic torque test of the dual-mass flywheel damping ring was completed,and the results were basically consistent with the theoretical values,and the expected goals were achieved.The main contents of this paper include:(1)This paper expounds the background of dual-mass flywheel,introduces the research status of domestic and foreign scholars on dual-mass flywheel,and puts forward the research significance of this paper.This paper introduces the structure and basic principle of dual-mass flywheel,and also introduces several typical dual-mass flywheel.Further determine the research objectives and content of this subject.(2)The energy dissipation mechanism of the dual-mass flywheel damping ring is studied based on fluid-structure interaction,and the torque characteristics of the damping ring change with the change of its own motion state and fluid lubrication state,and have strong nonlinear characteristics,which reveals the nonlinear torque characteristics of the damping ring and optimizes the structural parameters.(3)The nonlinear dynamic characteristics of the dual-mass flywheel under the conformal contact between the damping ring and the primary flywheel pressure plate were studied,and the contact action model was established and analyzed based on the Winkler model.A nonlinear dynamic analysis model considering the three-degree-of-freedom of conformal contact and the two-degree-of-freedom dual-mass flywheel without conformal contact is established,and the approximate analytical solution of the steady-state nonlinear frequency characteristics of the system is derived by the averaging method.The harmonic balance method and the Runge-Kutta numerical integration method are compared with the analysis method in this paper.By comparing the steady-state frequency characteristics and angular displacement transmittance under the three-degree-of-freedom model and the two-degree-of-freedom model,it is found that the structural conformal contact has a certain influence on the dynamic characteristics of the system.(4)The test scheme was proposed,the dual-mass flywheel damping ring test bench was built,the dynamic torque test of the dual-mass flywheel damping ring was carried out,and the torque characteristic results obtained by comparing the test and the theoretical results showed that the dual-mass flywheel introducing the damping ring improved the output torque of the engine,and the test results were basically consistent with the theoretical results.