模块化飞机结构优化设计的等效多工况法

随着航空科技的发展,追求飞机任务的多样化和低生命周期成本成为一大趋势,其中模块化飞机设计对于未来飞机设计的多用途以及经济性具有实际意义。针对模块化飞机结构优化设计的特点,提出了等效多工况(EMCO)法,将模块化结构优化问题分解为通用模块的多工况优化问题和各专用模块的独立优化问题。通用模块等效为承受多工况载荷的结构,并按多工况优化方法进行优化设计,使通用模块质量最轻。各型号的专用模块在此基础上分别进行独立的优化设计。通用模块和专用模块交替优化,直至目标函数值收敛。最后,分别通过模块化桁架结构和机翼结构优化实例展示了该方法的运用效果,并与单独优化结果和加权单目标优化结果进行了对比。结果表明该方法降低了计算规模,收敛效果较好。

Equivalent multi-case optimization architecture for modular aircraft structures

With the development of technology in aviation, aircraft that can be used for a wider variety of missions and have lower lifecycle costs become more prevalent. The design of the modular aircraft has a practical significance in the multi-purpose design and economic benefit. According to the features of modular aircraft structure design, an equivalent multi-case optimization (EMCO) architecture is proposed, which divides the modular optimization problem into the optimization of common module and individual modules. The common module is transferred to a structure under multiple loading conditions, and then is optimized under minimum weight objective. The individual modules in each structure are then optimized separately. The common module and the individual module are optimized alternately until the criterion of convergence is satisfied. The method is verified by a modular truss structure and a modular wing structure example, respectively. The comparision with the results of individual design and weighted single objective design method shows that the new method reduces the calculation scale and improves the convergence efficiency.