Abstract: For the multidisciplinary design optimization (MDO) of spacecraft with sub-vehicles, system mission requirements and disciplinary coupling relations are analyzed. Taking account of the design variables and constraints in payload, orbit and structure disciplines, the MDO model and related analysis models are built, with the comprehensive index involving the effective proximity region and total mass as the objective. Using the iSIGHT software to construct the solving architecture, the MDO model and analysis models are simulated and calculated with the collaborative optimization (CO) method based on penalty function, and reasonable results are obtained finally. The results prove the rationality of the MDO model and the effectiveness of using CO method to solve spacecraft MDO. The research process provides a typical example for the research of the spacecraft MDO and the disciplinary analysis models can be a reference for problems of the same kind.

Key words: spacecraft, multidisciplinary design optimization, model building, analysis, collaborative optimization