机载蒸发循环系统结构的稳健性研究

机载蒸发循环系统结构的疲劳寿命易受外界和内部环境的影响,导致无法满足设计要求。采用随机有限元法,参照设计变量和随机变量的变异性,建立机载蒸发循环系统结构疲劳寿命稳健性优化的数学模型;通过引入权因子α,将稳健性优化问题转化为结构疲劳寿命均值和标准差的双目标优化问题。结果表明:合理设置疲劳寿命均值和标准差的权因子,可有效降低设计变量和随机变量对变异的敏感性,进而提高机载蒸发循环系统结构疲劳寿命的稳健性。

Research on the robustness of airborne evaporation circulatory system structure

Abstract: As the fatigue life of airborne evaporation circulatory system structure is susceptible to the influence of external and internal environment, it does not satisfy the design requirements. Based on stochastic finite element method and considering the variability of design variables and other random variables, a mathematic model of the robustness optimization of fatigue life is established. As the robustness optimization of fatigue life of the airborne evaporation circulatory system structure robust optimization is studied, the robustness of fatigue life problem is transformed into the double objective problems of mean and standard deviation of fatigue life, which effectively reduces the sensitivity of the design variables for fatigue life and improves the robustness of fatigue life by setting the power factor of mean and standard deviation of fatigue life.