Finite Element Modeling Performance Simulation And Experimental Study Of A Dual Mass Flywheel Of A Car

With the rapid development of the modern automobile industry,people can not only be satisfied by the basic driving performance of the car,but also begin to pay attention to the ride comfort of the car,and the ride comfort of a car is closely related to its NVH characteristics.The torsional vibration problem of the powertrain seriously affects the NVH characteristics of the car,so reducing the torsional vibration of the drive train can improve the NVH level of the car to a certain extent.The dual mass flywheel torsional vibration damper(DMF)replaces the traditional clutch driven disc torsional vibration damper(CTD)as a new torsional vibration damper,which can effectively attenuate the torsional vibration of the drive train and can greatly avoid the phenomenon of transmission system resonance.Based on this background,this paper studies the circumferential long-arc spiral spring type double mass flywheel.The finite element method is used to design the key parts of the double mass flywheel,static stress analysis and fatigue prediction.Finally,the bench test of DMF-CS was carried out...Firstly,this paper introduces the typical structure and working principle of the dual mass flywheel,and analyzes the development status of the dual mass flywheel at home and abroad.After comparing with the traditional clutch driven disc torsional vibration damper(CTD),the outstanding superiority of the double mass flywheel in damping is demonstrated.It is determined that the research object of this chapter is the circumferential long curved spring type double.mass flywheel(DMF-CS).Secondly,under the condition of known engine performance parameters,the structure of the moment of inertia ratio and damping coefficient of the double mass flywheel,the shape of the disk spring and the bearing parts such as rivets are designed.According to the design goal of torsional stiffness,the torsional stiffness curve of the spring is determined,and then the diameter of the spring wire is determined,and finally a complete set of spring design parameters is obtained.The design method is applied to the design of the nested arc spring,and the design scheme of the nested arc spring is obtained.Then,a finite element mesh model was established in HyperMesh,and static analysis was performed using ABAQUS,including static over-torque stress analysis for primary mass,secondary mass,curved spring and force-transmitting plate;overspeed for primary mass and interference stress analysis;high-speed stress analysis for secondary mass;modal analysis of key components such as curved springs,and a series of analysis results,The results show that the static stress of each part is less than the strength limit of the material.Thirdly,the basic definition of fatigue fracture and the theory and method of fatigue calculation are briefly introduced.fatigue.Software Fe-safe was used to predict the fatigue life of two dangerous parts,the force transmission plate and the curved spring.Taking the stress result file obtained in ABAQUS as an input.The fatigue life prediction results are obtained.The results show that the fatigue prediction results of the force transmission plate and the curved spring are 10 million times,which can be considered as infinite life in engineering.Finally,a bench test was carried out on the DMF-CS,including: over-torque test,highspeed test,static low frequency and static high frequency fatigue endurance test.The test results were compared with the previously completed finite element over-torque simulation results,overspeed analysis results,and fatigue life prediction results.The comparison results show that DMF-CS does not break or deform under the action of 5 times engine torque or short-time operation at 12000 rpm,or at an input angle of 50° and repeating 5 million times.However,only a few parts have a little wear in a reasonable range.There is no significant change in the torsional characteristics,and there are only minor changes in the normal range.The reliability of the DMF-CS designed in this paper is verified,which lays a good foundation for the next step.