طراحي بهينه چند موضوعي يك ماهواره بر سبك از روش تحليل حساسيت سيستم

Multidisciplinary Design Optimization of a Small Launch Vehicle; a System Sensitivity Analysis Approach

Abstract-Multidisciplinary Design Optimization (MDO) approaches have significant effects on aerospace vehicle design methodology. In designing next generation space launch systems. MDO processes will face new and greater challenges. Needs to improve conceptual design capabilities have required an increase in the fidelity of empirical disciplinary models, improved design solutions and optimization methods, and reduced workload and design cycle time through advancedframeworks. Such a procedure could identify feasible designs and generate comparison and sensitivity data during optimization. This study uses a System Sensitivity Analysis method to optimize multidisciplinary design of a two-stage Small Solid Propellant Launch Vehicle (SSPLV) based on minimum launch mass. Suitable design variables and technological and functional constraints are considered, both at the system and discipline levels. Propulsion, weight, geometry and trajectory simulation disciplines are used in an appropriate combination. A Generalized Sensitivity Equation (GSE) is derived and solved, and the results ofthis equation are used for optimization. Comparing the results with the well known gradient based optimization methods proves the ability ofthe SSA method to reduce computation time.