Study On The Theory And Application Of Multidisciplinary Design Optimization For The Satellite System

Satellite System Design is a typical multidisciplinary problem. Multidisciplinary Design Optimization (MDO) is an effective method to resolve the design optimization and process integration, which is significant to improve the level of Satellite System Design and fulfill the object of "faster, better and cheaper" in satellites development. This paper aims at exploring the combination of MDO with the satellite system design process. After investigating MDO theories systematically, a MDO theoretical framework including the decomposition strategy, the coordination strategy, the search strategy and the MDO procedure has been established and applied in the system design of Lunar Explorer and InSAR Satellite Formation.Some MDO theories are discussed as follows:Firstly, two decomposition strategies------Functional Dependency Table (FDT) andDesign Structure Matrix (DSM) based on the graph theory are studied. The FDT decomposition model based on hypergraph and DSM decomposition model based on graph are analyzed. The testing results show that a reasonable disciplinary decomposition is beneficial to resolve some MDO problems quickly and exactly.Secondly, a coordination strategy of Response Surface Methodology (RSM) is brought forward on the basis of an improved Kriging model (VKRG-RS). It carries out the variable complexity modeling method and takes full advantages of the quadratic polynomial RSM and Kriging model. The testing results in three examples with different complexity show that this strategy can improve the approximation precision and computation efficiency of response surfaces and can also enhance the convergence of MDO procedures using RSM.Thirdly, as a search strategy of the design space, Particle Swarm Optimization (PSO) is discussed. An improved PSO (IPSO) and a hybrid PSO (HPSO) are presented respectively. The latter algorithm is a combination of Powell, Pattern Search and IPSO. The results of four global optimization functions show that two kinds of the new PSO do better in the global convergence and computation efficiency.Finally, an improved MDO procedure for BLISS 2000 (Bi-Level Integrated System Synthesis 2000) is proposed and named HBLISS (Hybrid BLISS 2000). VKRG-RS and HPSO are both integrated into HBLISS. The parallel computation of HBLISS is also implemented under HLA/RTI. The results show that HBLISS has the superiority in the disciplinary autonomy and convergence, and its parallel implementation can decrease the computation time greatly.Some MDO applications are discussed as follows:Firstly, for the satellite system design process, the pertinent problems about modeling are investigated. The system design flow, scheme forming flow and their model architectures are all analyzed deeply, the concept of model trees and scheme trees are brought forward, and then a basic structure of the satellite system MDO is built, as well.Secondly, the MDO of Lunar Explorer is studied in accordance with the above investigations. This kind of Satellite System Design mainly belongs to the inheriting design. A parametric optimization model of Lunar Explorer is set up with the cost per information as its objective. After a reasonable disciplinary decomposition, the MDO problem is integrated and resolved by HBLISS. Then, the results confirm the feasibility and validity of HBLISS and offer a better system design.Thirdly, the MDO of InSAR Satellite Formation with the mission of global elevation measurement is discussed. This kind of Satellite System Design mainly belongs to the innovative design. The couplings between parameters of the formation configuration, SAR antenna and satellite bus are analyzed. Then, an optimization model with the system cost as its objective is established and decomposed. Its integration and resolution are both implemented using parallel HBLISS. The corresponding results testify the superiority of MDO and lay the foundation for the further design.Finally, a multidisciplinary integrated design system is built for Satellite System Design. It can be applied in the multidisciplinary design, analysis and optimization of the concept and preliminary design phase. Then, on the basis of it, a preliminary architecture is conceived for the development of the enterprise-oriented digital integrated design system.To sum up, a relatively complete framework of MDO theories is formulated and used to resolve the system optimization design problems of Lunar Explorer and InSAR Satellite Formation. All of these are beneficial tries to explore the application of MDO in Satellite System Design and good foundations to further research on the theories and applications of MDO.