Research On Damping Spring Characteristic Of Dual-Mass Flywheel

The dynamic transmission system of automobiles is a multi-DOF torsional vibration system. Torsional vibration and noise resulting from torsional vibration are important aspects, which affect automobiles' performance. The dual-mass flywheel used as a core unit of dynamic transmission system of modern automobiles is widespread increasingly. The damping spring is a major component of the dual-mass flywheel, whose elastic property directly determines the performance of the dual-mass flywheel. The main bottleneck in the way of the development of dual-mass flywheel in domestic is that the research of elastic property of the damping spring hasn't yet matured and the design theory of the damping spring is unknown.In view of the present situation mentioned above, this paper met the practical requirements of enterprises and took the dual-mass flywheel that matches with a new type of VM diesel engine as the research object. Firstly, the vibration analysis model of dual-mass flywheel was set up, and the model within forced torsional vibration and free torsional vibration were calculated. According to the calculation results, this paper presented the initial model of elastic property curve of the damping spring, which lays the foundation of the analysis of elastic property and the structure design of the damping spring.Next, this paper analyzed the elastic property of the damping spring by discrete method, and deduced calculation formula of the static elastic property. On the basis of calculation formula, this paper combined with test data and designed structure size of the damping spring reasonably.And then, this paper built the virtual prototype model of the dual-mass flywheel, and used the flexible body to simulate the damping spring. A simulation of dynamic elastic property was taken by this virtual prototype mode. The simulation results not only verified the formula of the static elastic property, but also made a further research on the dynamic elastic property of the damping spring. Finally, this paper made an experimental research on the elastic property test of the damping spring. A test method for the static elastic property is presented and the test bench is designed. Comparing the result of test with the result of theoretical-arithmetic deduction, the error between them was allowable. At the same time this paper also discussed the causes of error.