基于子结构法的活塞温度分布及机械应力分析

Temperature Distribution and Mechanical Stress Analysis of Piston Based on Substructure Method

以某增压柴油机活塞为研究对象,采用分离活塞内冷油腔的方式,建立了活塞的常规有限元模型和子结构有限元模型。通过对以上该活塞的两种有限元模型进行温度场以及机械应力场分析后,结果显示:子结构有限元模型的温度以及机械等效应力分布与常规有限元模型基本一致,数值误差小于3%。在进行机械应力场分析中,求解时间减少47.3%。因此,子结构法适用于柴油机活塞的有限元分析,并为将来的柴油机活塞优化设计提供了理论依据。

The conventional finite element model of a turbocharged diesel engine piston is established by separating the inner cooling oil chamber. Through the analysis of the temperature field and mechanical stress field of the two finite element models of the piston, results sbow that the substructure finite element model of the temperature and the equivalent meebanical stress distribution with conventional finite element model is basically similar, the numerical error is less than 3%. In tbe analysis of mechanical stress field, the solution time is reduced by 47.3%. Therefore, the finite element analysis of piston of diesel engine based on the substructure method provides a theoretical basis for the optimization design of diesel engine piston in the future.