Torsional Vibration Simulation And Fatigue Analysis Of The Engine Crankshaft Linkage Mechanism

With the increasingly stringent application of auto-related laws and regulations, andincreasingly high demand for car ride comfort, research of engine noise, vibration and ride(NVH) draws more and more attention. So more accurate, more comprehensive and moreefficient study of crankshaft system vibration problems is required. More accuratesimulation results can be drawn with virtual prototyping technology combined with thefinite element method. So this method is significant for the design and optimization of theengine crankshaft.In this paper, the Engine crankshaft linkage mechanism of EQ4H is taken as theresearch object. Firstly, three-dimension-model for the crankshaft linkage mechanism arebuilt by the graphics software UG, and the kinetic theory of the models is analyzed to laythe foundation for further research. Modal analysis of the crankshaft is carried out inANSYS software to get its natural frequency in each order. Then dynamics of the modelsare simulated using ADAMS, and simulation results of rigid body dynamics model andthe soft body dynamics model are compared. It is proved that the flexible body dynamicsmodel can be more accurate from the simulation results, and then soft body dynamicsmodel of the crankshaft torsional vibration analysis, affect the torsional vibration of theharmonic frequency. Accurate stress and strain on the crankshaft are analyzed usingANSYS, and then fatigue analysis of the crankshaft in ANSYS / FE-SAFE to find theeasy-of-fracture dangerous parts, the impact of the final study crankshaft structuralparameters on the maximum stress which can provide theoretical bases for theoptimization of the crankshaft.