Jixie chuandong (Apr 2024)
Optimization of the Input Shaft Torsional Amplitude of a DCT Gearbox
Abstract
Torsional vibration of the automobile transmission system may cause roar or abnormal noise in the car. Torsional vibration excitation generally comes from the main order of the engine and is transmitted to the gearbox through torsional vibration damper. Therefore, the torsional amplitude of the gearbox input shaft is the first factor to control the torsional vibration of the whole transmission system. A passenger car is equipped with a 6-speed wet double clutch transmission (WDCT). The maximum torsional amplitude of the input shaft of the gearbox from 2nd gear to 6th gear has reached 494.38 rad/s2, which does not meet the design requirement of 400 rad/s2. In order to solve the problem that the torsional amplitude of the gearbox input shaft is too large, this study uses AMESim software to build a torsional vibration analysis model with dual mass flywheel torsional vibration damper under full throttle driving condition, taking the engine speed fluctuation signal collected by a real vehicle as the excitation source. Through simulation analysis, the influences of the primary mass moment of inertia, secondary mass moment of inertia, torsional stiffness, basic damping torque and free rotation angle of the dual mass flywheel on the torsional amplitude of the gearbox input shaft are determined, and the optimization scheme of the transmission system is obtained through orthogonal experimental design, and the effectiveness of the optimization scheme is verified by a real vehicle. The research methods and ideas of this study provide a solution for the torsional vibration optimization of the automobile transmission system with dual mass flywheel torsional vibration damper.
