压气机套装叶轮的三维接触非线性有限元分析  

3D Nonlinear FEM Contact Analysis of Compressor Impeller

作　　者：廖爱华[1] 张洪武[1] 吴昌华[1] 

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,大连116024

出　　处：《内燃机工程》2006年第5期62-66,共5页Chinese Internal Combustion Engine Engineering

基　　金：国家基础性发展规划项目资助课题(10225212;10302007)

摘　　要：增压器压气机叶轮、轴套和轴采用过盈配合技术联成一体,这是典型的三维多体接触问题。本文以某柴油机涡轮增压器的压气机为例,采用有限元参数二次规划法,并结合多重子结构技术分析求解叶轮与轴套、轴套与轴的三维弹塑性有摩擦接触问题,针对不同的过盈量、摩擦系数和转速进行了大量计算,获得了叶轮、轴套与轴之间接触应力的相应分布规律。分析表明:随着叶轮与轴套间过盈量的增大,轴套的外表面与内表面的接触应力是线性增大的,而且内表面的接触应力增加较为迅速,这对于确定合理过盈量和改进设计具有参考意义。The FE parametric quadratic programming （PQP） method which was developed based on the parametric variational principle （PVP） was used for the analysis of the stress distribution of 3D elastoplastic frictional contact problem of impeller-shaft sleeve-shaft, using the multi-level, multi-branch substructure technique of FE. The effects of fit tolerance and rotational speed, the displacement and the contact stress on the interference-fitting surfaces were discussed in detail in the numerical computation. A range of friction coefficients in contact interfaces was investigated in order to represent the mechanical behaviors of the structure due to the change of the interface characteristic. To decrease the difficulty of the assembling process and make sure the safety of the working state, the suitable amount of the interference was studied so that the interface could have adequate contact pressure under full load. The results obtained provided an effective approach which achieved more reliable interference-fitted connections and more precise assembly accuracy.

关 键 词：内燃机 压气机叶轮 过盈配合 非线性接触 二次规划法 

分 类 号：TK423.52[动力工程及工程热物理—动力机械及工程]