Study On Torsional Vibration Of Vehicle Transmission System Based On Clutch Shock Excitation And Design Of Simulation Test Bed

With the rapid development of automobile industry, the continuous improvement ofautomobile power and speed, the development of automobile structure lightweight trend,people begin to pay attention to the safety, comfort, and other performance of vehicles.Torsional vibration will not only affect the automobile power performance and comfort, butalso affect the fuel economy, safety and other performance, improve the torsional vibrationcharacteristics of the vehicle transmission system is an important way to improve thecomprehensive performance of the vehicle. In this paper, the torsional vibrationcharacteristics of vehicle transmission system is analyzed based on clutch excitation andengine excitation, and the simulation test-bed is designed. Mainly research on the followingaspects:1．Elaborated the function and classification of vehicle transmission system and clutch ofvehicle, and analyzed the major vibration source that cause the torsional vibrationphenomenon of vehicle transmission, especially, the engine and clutch excitation wereanalyzed, and analyzed the response of the clutch of excitation and the influence on thevehicle comfort by establishing a simple model for clutch, and then the main theoretical basisof torsional vibration of vehicle transmission system was studied, and the two kinds ofmathematical model of torsional vibration of vehicle transmission system were analyed, andthe calculation method for free vibration and forced vibration were studied.2．In the analysis of the equivalent system of vehicle transmission system and thesimplified method, the main assembly of vehicle transmission system is simplified, andaccording to the principle of equivalent system and modeling method of lumped mass model,the vehicle transmission free torsional vibration and the forced torsional vibrationmathematical model is given, and the model matrix parameters were determined, and then thesimulation analysis of vehicle transmission system free torsional vibration characteristics andforced torsional vibration characteristics were conducted, the results of which indicates thatbasically the critical rotation speed is not in the common rotation speed range of the major vibration source, and when the excitation frequency coincides with the natural frequency, thetorque amplitude is relatively large.3．In order to test the torsional vibration characteristics of vehicle transmission system,the simulation test-bed of torsional vibration of vehicle transmission system was designed,mainly designed the overall program of the test-bed, the mechanical assembly, translationquality and driving damping simulation, data acquisition system and test-bed control system,and mainly completed the mechanical assembly.