航空发动机空气管路应力优化设计

针对航空发动机空气管路系统受载应力及应变过大的问题,对该系统进行3维全尺寸弹塑性分析,讨论了载荷加载过程对应力应变的影响;对应力较大部位采用结构分解方法建立优化模型,进行管路部件应力优化,获得三通结构尺寸优化结果;利用参数灵敏度分析结果选择合适的设计变量,建立系统管线优化模型,补偿热-位移载荷产生的附加应力。优化结果显示,最大总应力降低5.49%,附加载荷应力降低12.28%。验证了方法的有效性。

Optimization Design Method of Aero-Engine Air Duct System

Aimed at the large stress and strain of aeroengine air duct system, 3D elastoplastic analysis on the full scale of aeroengine duct system was done. The influence of loading process on stress and strain was discussed. The optimization model of the duct parts with large stress was built by structural decomposition method, and the tee branch structure size optimization results was obtained by optimize the stress of duct parts. Proper design variables were chosen from the parameter sensitivity analysis results. The pipeline system optimization model was established, and additional stress generated by thermal and displacement loads was compensated to a lower level. The optimization result shows that: the maximum stress is decreased by 5.49%, and the additional stress is decreased by 12.28%. The validity of the method is verified.