The Characteristic Study On Torsion Vibration Of Dual Mass Flywheel And Its Simulation Analysis

There are many factors that result in torsional vibration in Automotive Powertrain. The torque undulation of the engine crank is one of the most important among these factors. In order to eliminate the main low-frequent torque vibration and to reduce the noise from gearbox and final drive, it is quite effective to set a spring-damping torsional absorber between engine and transmission system.Traditional method, to control torsional vibration and noise, is setting a Clutch Torsional Damper (CTD) in the clutch plate. However, it has been proved that CTD system has serious disadvantages. This project is about a new type of torsional vibration damper in the transmission system——Dual Mass Flywheel (DMF), which is highly valued because of its excellent performance.This thesis has introduced the general situation of torsional vibration damper and the performance of CTD and DMF detailedly. Begining from the history, the basic structure, the theory of vibration reduction and the function of dual mass flywheel, the characters and advantages of DMF are analyzed, which act as a"lowpass filter". The project, using Jacobi eigenvalue method in the software of MATLAB, obtains the speciality of free vibration in the transmission system of a certain type of truck. Meanwhile, kinetic model of DMF torsional absorber is built in the software of ADAMS so that its free and forced vibration can be analyzed. By the method of simulation, torsional vibration characteristic of DMF clutch assembly are obtained, and some parameters that affect the whole DMF system are discussed, such as inertia ratio of two discs, spring stiffness and magnitude of damping.There is considerable application pententials of the technology of DMF. Accordingly, it has great theoretical value and practical significance to research on the torsional vibration performance of Automotive Powertrain that equipped with DMF.