中文摘要：

以某发动机轴系为研究对象,运用有限元建模,结合动力学、润滑理论对轴系动态应力分布进行分析,采用非线性弹簧（NONL）、动态液压润滑（HD）、弹性动态液压润滑（EHD）对轴系应力进行对比分析,并针对曲轴振动过程中影响曲轴应力分布的因素进行分析。结果表明,不同算法下曲轴的应力分布差别主要是由于曲轴的扭转和弯曲计算结果有差别,同时曲轴在不同时刻不同截面由扭振和弯振引起的应力大小的贡献度不同。以EHD为基本模型进行分析表明,润滑参数油槽对主轴颈应力分布影响较小,只有-2.5~2.5 MPa。

英文摘要：

An engine crankshaft was investigated.The finite element method,dynamics method and lubrication theory were used to analyze the dynamic stress distribution of the crankshaft.At the same time,the nonlinear spring（NONL）,dynamic hydraulic lubrication（HD） and elastic dynamic hydraulic lubrication（EHD） were used to analyze the crankshaft stress.Some parameters that influence on the stress distribution of the crankshaft were analyzed.The results showed that the stress distribution of crankshaft was different under different calculation models,because the torsional vibration and bending were different.At the same time,the stress caused by the contribution of torsional vibration and bending vibration in different sections at different times was different.Oil groove were also studied to investigate the influence that these parameters on the stress distribution based on the EHD model.It had little influence on the stress distribution.The value range was only-2.5~2.5MPa.