Modeling method for transmitting mechanism torsional vibration analysis of passenger car under different operating conditions

Abstract

The invention discloses a modeling method for transmitting mechanism torsional vibration analysis of a passenger car under different operating conditions. The modeling method is used in accurate prediction and analysis of transmitting mechanism torsional vibration characteristics of a passenger car under different operating conditions; according to the method, on the basis of a traditional concentrated parameter model, engine excitation, crank link mechanism moment of inertia, time-varying characteristics of gear meshing stiffness, clutch torsional shock absorber and the non-linear stiffness of the gear backlash are added to consideration; a simulation model suitable for analysis of transmitting mechanism dynamics characteristics of passenger car under different operating conditions is established; the engine cylinder pressure data under specific operating conditions is obtained through actual measurement or simulation as excitation; equivalent resistance moments of the rolling resistance and the air resistance are used as load to realize simulation of a passenger car under specific driving conditions. The method of the invention has strong practicality and has simple calculation; the method is suitable for the accurate prediction and analysis of transmitting mechanism torsional vibration characteristics of a passenger car.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission and vibration and noise, and relates to a research technology on the torsional vibration of an automobile power transmission system, in particular to a technology applicable to different working conditions of passenger vehicles and capable of accurately predicting the torsional vibration characteristics of the vehicle power transmission system Modeling and analysis methods. Background technique [0002] The automotive power train is mainly composed of the engine, gearbox, transmission shaft, final reducer and wheels, etc., and is a shaft torsion system that mainly rotates. During the running of the car, changes in the excitation force from the engine, road surface, and inside the gearbox will cause the torsional vibration of the drive train. When the frequency of the external excitation is close to the natural frequency of the system, torsional resonance will occur. At this time, t...

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Problems solved by technology

[0006] (3) The effect of engine-driven accessory equipment on the driveline is not taken into account;

[0045] In the modeling process, the engine excitation is usually directly loaded on the flywheel or the input shaft of the gearbox with the average output torque or the second-order torque fluctuation as the input. Under transient conditions, the engine excitation is difficult to accurately describe with the above method

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