关键词: 活塞；多学科优化设计；耦合作用；正交试验设计

Abstract:

Based on the principles of MDO, the stress by coupling the heat and the mechanical load was computed. The results show that the mechanical load is the major stress. A searching strategy of multidisciplinary design which was based on orthogonal distribution design of experiments was put forward. After the optimization, the weight of piston decreases 46%. Analyzing the sensitivity of design variables, the effects of the three factors(field of fire,thickness of top,space between block) on coupling stress of piston and that on mechanical stress of piston are almost the same. Among the three factors, the effect of field of fire is the most obvious one. The three factors have no obvious effect on the temperature of piston.

Key words: piston, multidisciplinary design optimization(MDO), coupling effect;orthogonal design of experiment