Multidisciplinary Design Optimization Technology

This thesis systematically research multidisciplinary design optimization(MDO) technologies based on the conceptual design process of aeronautic and astronautic products, and develop the framework-MDOF, which can support MDO.Firstly, high performance optimization algorithms are researched. By presenting the mathemetical base and computational flow, two kind stochastic algorithms: genetic algorithm and simulated annealing algorithm are discussed. After that, these algorithms are applied to conceptual design of integrated ramjet missile. According to the results, the performance of algorithms is assessed. Since genetic algorithm has global searching ability and complex algorithm has capacity in searching local optimum, they are combined to optimize integrated ramjet missile design problem, and better result is gained.Then, by differentiating single-disciplinary optimization and multi-disciplinary optimization, the concepts of multidisciplinary design optimiztion and MDO method,or formulation are introduced. In this part, six MDO methods are researched, focusing on the computational flow and performance. Especially, one kind method--Collaborative Optimization(CO) is discussed. By applying CO in two function problems, the performance of CO is analyzed and improved. In the end of this part, CO is applied in conceptual design of launch rocket. Not only parallel disciplinary optimization process is implemented, the convergent solution is gained. So the feasibility of CO applied in conceptual is verified.Sequentially, MDO technical system is researched. Due to the development status, MDO technical system is classified by eight technical segments.The connections between these segments are discussed, and the roles of them are presented. After that, the content of each segment is discribed in detail.Finally, the requirements for a ideal framework to support MDO are dipicted by synthesizing the NASA's research report with author's experience. According thesereqirements, the MDO framework-MDOF is developed with the Oriented Objectconcept absorbed in development process. By two examples, the simplity and effectivity of MDOF to solve MDO problem are verified.