The Design Methods And Torsional Vibration Isolation Characteristics Of MRF-Dual Mass Flywheel

With the continuous improvement of people's living standards,people are increasingly demanding car ride comfort,while the drive train is directly connected to engine,poor working conditions have a great impact on the vehicle NVH performance.Drive train working environment is largely improved by Double Mass Flywheel(DMF)technology,which is played a significant role for irregular engine torque ripple attenuation.While the DMF damper is too single to meet all the conditions of its requirements,which limit the development of DMF.Combined with new smart materials magnetorheological fluid(MRF),and apply it to the DMF technology,a new magneto-rheological fluid dual-mass flywheel(MRF-DMF)is developed which ensure that its damping can be effectively controlled,meet the performance requirements under ideal conditions.In this paper,theoretical analysis and experimental verification are combined to explore the design method of MRF-DMF.The main contents of this paper has four parts.The first part introduces the torsional vibration problems for the comfort of the automobile,and then introduces appearance,principles,applications,as well as the limitations of current traditional DMF.Finally,a new type of smart materials MRF is introduced,as well as areas of current research and applications domestic and overseas.The damping structure is demonstrated and basic structure is introduced in the second part.Key parameters of long arc spring are calculated and simulation optimization of the magnetic field are analyzed to identify the relationship between the current and the magnetic field strength.The drive train with MRF-DMF torsional vibration model is established in the third part to analyze the damping characteristics of different conditions for the requirements of the flywheel,which be ready for damping controller design and road test.The bench and road test are introduced in the last.Static characteristic test of bench test verify the flywheel damping characteristics,and dynamic performance test proves the flywheel dynamic stiffness and hysteresis angle can be changed with the change of current.Speed fluctuation of first and second quality are collected in road test to test the flywheel effect of vibration isolation,and final test result is very consistent with the simulation.