发动机有限元及疲劳分析.pdfVIP

计算机辅助工程  Computer Aided Engineering  论文所属行业：汽车  发动机有限元及疲劳分析  李相旺，李欣，张志明，黄凤琴，尹曼莉 (东风汽车公司技术中心，湖北省武汉市，430058)   摘要：某汽油机开发阶段，须对发动机各主要部件结构强度及刚度做全面评价，并且须考核 缸盖缸体的高周疲劳性能。首先基于 STRA-CCM+计算出水套内部气体温度和对流换热系 数，然后将其映射到水套有限元网格表面上作为温度边界条件。得到整个机体的温度场分布 以后，在考虑各部件接触非线性的基础上得到机体各部件的应力、变形等结果并进行评价。 最后在有限元结果的基础上考虑材料温度非线性对缸体缸盖疲劳安全系数进行考查。通过分 析发现，缸盖局部应力偏大，下缸体和油底壳接触面局部间隙过大，缸体缸盖疲劳安全性能 满足要求。 关键词：汽油机；缸盖；缸体；有限元法；强度；刚度；非线性；疲劳 中图分类号：U464.1 文献标志码：B Finite Element and Fatigue Analysis of Engine Li Xiangwang, Li Xin, Zhang Zhiming, Huang Fengqin, Yin Manli (DONGFENG MOTOR CORPORARION TECHNICAL CENTER, Wuhan, Hubei, 430058) Abstract: During the development of one gasoline engine, it is need to evaluate the intensity and stiffness of every component, and also the fatigue performance of cylinder head and block. Firstly, the gas temperature and convection coefficient flow are obtained base on STRA-CCM+ ，then they are mapped to FEM grids of water jacket. Considering nonlinear contact between different parts, the stress and deformation distribution can also be obtained and evaluated after getting the temperature distribution of all block. Finally the fatigue performance of cylinder head and block is checked with considering temperature nonlinear of material based on finite element results. According to analysis above, the local stress of cylinder head and clearance between bedplate and oil pan dont meet desire. The fatigue performance of cylinder head and block meets desire. Key words: gasoline engine; cylinder head; cylinder block; Finite Element Method; intensity; stiffness; nonlinear; fatigue _______________________ 作者简介：李相旺（1986—）