飞行器多学科设计优化的三种基本类型及协同设计方法

运用多学科设计优化方法,根据飞行器设计中遇到的实际情况,提出三类基本的飞行器多学科设计优化问题:耦合、信息单向传递、独立。一般的飞行器设计问题可以视为提出的这三种基本类型的组合。以设计实例对这三类问题的数学模型及解决方案进行了深入分析。介绍了协同优化方法的设计思想,并提出了应用协同优化方法解决上述三类问题中最复杂的耦合问题的具体计算结构。应用该计算结构,可以避免求解耦合方程组并实现各学科并行设计,提高了计算效率。

Three Kinds of Basic Multidisciplinary Optimization Problems in Flight Vehicle Design and Application of Collaborative Optimization

According to the way of information exchange between two different disciplines,three kinds of basic multidisciplinary optimization (MDO) problems in flight vehicle design are presented,that is,bilateral information flow,unilateral information flow and no information flow.A general flight vehicle MDO problem can be treated as the combination of the three kinds no matter how many disciplines it involves and how complex it is,which is helpful to model a MDO problem.Mathematical modeling and computational analysis of the three kinds of problems were performed.The analysis shows that the bilateral information flow problem is the most difficult one because there is a coupled equation system to be solved.To overcome this obstacle,collaborative optimization was applied.In collaborative optimization,the coupled equation system is replaced by systemlevel consistent constraints,which effectively avoids the computational difficulties in solving coupled equation system.