Wave Induced Fatigue Simulation and Structural Optimum of Downsized Engine
Based on Rover K16 internal combustion engine model,a thermal-mechanical coupling simulation model was estab-lished and verified by literatures.The simulation results show that the maximum stress appears at the center of the top surface of the piston and decreases as the top thickness increases.The fatigue life of the piston under knocking condition was predicted.When the top thickness of the piston increased from 7.6mm to 12.6mm,the driving mileage under normal knocking condition increased from 24,200km to 213,300km.When the top structure is changed to flat top or convex top,the piston life is greatly improved and the weak area becomes the oil drain hole.By optimizing the parameters of piston pin hole,the stress concentration at the oil drain hole is reduced and the fatigue life is improved.Finally,the fatigue life of the gray cast iron piston with convex top without drain hole under super knocking condition was simulated,and it was obtained that the internal combustion engine could run continu-ously for 226,800km,reaching the prescribed mileage of220,000km.
Small Enhanced Internal Combustion EngineEngine KnockingStrengthFatigueStructure Opti-mization
万方数据
维普
