某柴油机曲轴三维有限元分析与优化

Three-dimensional Finite Element Analysis and Optimization of a Diesel Engine Crankshaft

曲轴不仅是柴油发动机中最重要的零件,也是承受载荷最大的零件,柴油机的耐用程度和可靠性与其密切相关。在有限元法的基础上,通过Pro/E和ANSYS的接口先在Pro/E中建立曲轴几何模型,将模型导入ANSYS中,对曲轴模型载荷和约束边界进行处理和简化,对三种不同约束条件下的应力及应变进行分析确定最优约束条件,并通过分别对不同的曲柄圆角大小、厚度和轴颈重叠度的计算分析确定最佳优化方案。

The crankshaft is not only the most important part of the diesel engine,but also the one bearing the greatest load.The durability and reliability of the diesel engine are closely related to it.On the basis of the finite element method,the geometric model of the crankshaft is first established in Pro/E through the interface of Pro/E and ANSYS,and the model is imported into ANSYS.The load and constraint boundary of the crankshaft model are processed and simplified.The stress and strain under the three different constraints are analyzed to determine the optimal constraint condition,and the optimum plan is determined by calculation and analysis of different crank fillet size,thickness and shaft journal overlap.