摘要
在详细分析发动机活塞负荷的基础上,提出活塞的机械、热边界条件,经过有限元计算得到活塞的机械应力、热应力及耦合应力。计算结果显示原设计活塞有较大的储备强度,有进一步优化的可能。采用短活塞方案对原活塞进行结构改进,改进后的活塞减小了压缩高度,降低了质量,使活塞结构更趋合理;有限元分析表明,各种应力应变均在设计允许范围之内,活塞结构的改进是成功的。
Based on the analysis of the loads of engine piston, mechanical and thermal boundary, conditions of the piston were given. After finite element caleulation, the mechanical, thermal and coupling stress of piston was obtained. The results show that the original piston has enough intension and possibility to be improved. The structure of short piston was employed to optimize this piston. After optimizatioll, the compression height and mass of the piston are reduced. The structure of piston is more reasonable. The results of finite element calculation show that the stress and strain is in the range of design. The improvement of piston structure is successful.
出处
《机械强度》
EI
CAS
CSCD
北大核心
2007年第3期501-506,共6页
Journal of Mechanical Strength
基金
清华大学汽车安全与节能国家重点实验室开放资金资助项目(KF2005-010)
关键词
活塞
有限元
优化
Piston
Finite element analysis
optimization
