Research On Matching Design Of Circumferential Short Spring Dual Mass Flywheel

Torsional vibration generated by automotive power transmission system is one of the main sources of automotive vibration.Torque fluctuation caused by engine is the main cause of torsional vibration excitation of transmission system.The traditional method of controlling torsional vibration of transmission system is to install torsional damper on clutch driven disc,but the installation space of this damper is limited and the effect of vibration reduction is poor.Dual-mass flywheel has good vibration reduction performance and has been widely used at home and abroad.In this paper,the circumferential short spring dual-mass flywheel is taken as the research object.The matching design of the primary inertia ratio,three-stage torsional stiffness and damping coefficient of the dual-mass flywheel is carried out.The dynamic law of torsional stiffness and damping of dual-mass flywheel varying with engine speed is explored through bench test.Firstly,according to the principle of simplification of equivalent torsional vibration of power transmission system,the torsional vibration models of the prototype car under idle and driving conditions are established respectively.Free vibration and forced vibration simulation models under different gears are established by using AMESim software,and torsional vibration tests are carried out on the hub of the semi-anechoic chamber of the vehicle.By comparing the simulation results with the test data,the validity of the simulation model is verified,which lays the foundation for the dynamics simulation of dual-mass flywheel.Secondly,based on the torsional vibration model of the system,the design model of dual mass flywheel is established.Using the first and second order torsional vibration frequency formulas of the system under idle conditions,the ratio coefficient of inertia of the primary flywheel and the range of torsional stiffness of the first flywheel are obtained.According to the ultimate torsion moment and the ultimate torsion angle transmitted by the flywheel,the values of the second and third-order torsion stiffness are determined,and the third-order torsion stiffness of the dual-mass flywheel is optimized.Thirdly,by using the above method,the circumferential short spring dual-mass flywheel is matched for a FR model car.By comparing the dynamic simulation before and after matching the dual-mass flywheel,the vibration reduction performance of the dual-mass flywheel is verified.According to the matching performance parameters,the threedimensional structure diagram was designed by Pro/E software,and the processing requirements of the main parts were determined.Then,by using batch processing function of AMESim software,the effects of initial flywheel inertia ratio coefficient,torsional stiffness and damping coefficient on dual-mass flywheel performance are simulated and analyzed.Finally,based on the five-motor test room,a bench test was built to simulate the actual working condition of the circumferential short spring dual-mass flywheel,and the dynamic law of the torsional stiffness and damping of the dual-mass flywheel varying with the engine speed was studied.