压气机叶轮-轴套-轴摩擦接触的有限元分析  

FEA on Frictional Contact Problems of Impeller-Shaft Sleeve-Shaft

作　　者：廖爱华[1] 张洪武[1] 吴昌华[1] 

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

出　　处：《中国机械工程》2006年第10期1010-1014,共5页China Mechanical Engineering

基　　金：国家自然科学基金与创新群体基金资助项目(10225212;10421002);国家重点基础研究发展计划资助项目(2005CB321704)

摘　　要：以某柴油机涡轮增压器的压气机为例,基于多重子结构技术,建立了增压器压气机叶轮、轴套和轴的三维整体有摩擦弹性接触的计算模型,采用有限元参数二次规划法,对其进行有限元分析。针对不同的过盈量、摩擦因数、轴套壁厚和转速进行计算,获得了叶轮、轴套与轴之间接触应力的分布规律。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。Based on the FE parametric quadratic programming （PQP） method, the stress distribu tion of 3-D frictional contact problem of impeller-shaft sleeve-shaft assembly was analyzed. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference -fit loading was used for the numerical analysis. To save the time cost in the numerical computation, multi--substructural technique was adopted for the ：structural modeling. The effects of fit tolerance, coefficient of friction, the wall thickness of shaft sleeve, rotational speed and the contact stress distri bution on the mating surfaces were discussed in the numerical computation. It is found that nonuni- form initial amount of interference in the structural design will avoid relative displacement generated and ensure uniformity of the contact stress. The study provides an effective approach which achieves more reliable interference-fitted connections and more precise assembly while eliminating the need for using high-precision and high-cost manufacturing methods.

关 键 词：涡轮增压器 压气机叶轮 有限元法 三维有摩擦接触 参数二次规划法 

分 类 号：TK413.52[动力工程及工程热物理—动力机械及工程]