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以飞翼布局飞机总体设计为例,展示如何将多学科设计优化(MDO)方法有效地应用于非常规布局飞机总体设计。基于二级优化方法,提出一种飞机总体MDO实施流程。该流程包括系统级优化、子系统级优化(或评估)和多学科模型生成器3个部分。系统级优化的任务是优化全局设计变量,使系统目标最优。子系统级优化涉及的学科包括气动、隐身、结构、总体布置、重量和性能,其任务是调整局部设计变量,满足本学科的设计要求,并使本学科目标最优,或对给定方案进行评估。多学科模型生成器的功能是根据飞机外形几何模型自动生成各学科分析模型,它是实现MDO流程自动化的一个关键环节。根据飞机MDO实施流程,集成各学科的分析模型和优化模型,建立了飞机总体MDO计算环境。应用算例表明:所提出的MDO实施流程能成功解决非常规布局飞机总体设计问题。
Taking the overall layout of the flying wing layout as an example, this paper shows how to apply the multidisciplinary design optimization (MDO) method to the overall layout of the unconventional layout aircraft effectively. Based on the second-level optimization method, a general aircraft MDO implementation process is proposed. The process includes system-level optimization, subsystem-level optimization (or evaluation) and multidisciplinary model generator 3 parts. The task of system-level optimization is to optimize global design variables to optimize system goals. Subsystem-level optimization involves disciplines such as aerodynamics, stealth, structure, overall placement, weight, and performance with the task of adjusting local design variables to meet the discipline’s design requirements and to optimize the discipline’s objectives or to target a given project Evaluation. The function of the multidisciplinary model generator is to automatically generate disciplinary analysis models based on the aircraft geometry model, which is a key step in automating the MDO process. According to the MDO implementation process of the aircraft, the analysis model and optimization model of each discipline are integrated, and the overall MDO computing environment of the aircraft is established. The application examples show that the proposed MDO implementation process can successfully solve the overall design problem of unconventional layout aircraft.