Multidisciplinary Optimization of Controlled Space Structures With Global Sensitivity Equations

Le résumé fourni par la source

A new method for the preliminary design of controlled space structures is presented. The method coordinates standard finite-element structure analysis, multivariable controls, and nonlinear programming codes and allows simultaneous optimization of the structures and controls systems of a spacecraft. Global sensitivity equations are a key feature of this method. The preliminary design of a generic geostationary platform is used to demonstrate the multidisciplinary optimization method. Fifteen design variables are used to optimize truss-member sizes and feedback-gain values. The goal is to reduce the total mass of the structure and the vibration control system while satisfying constraints on vibration decay rate. Incorporating the nonnegligible mass of actuators causes an essential coupling between structures design variables and controls design variables. The solution of the demonstration problem is an important step toward a comprehensive preliminary design capability for structures and controls systems. Use of global sensitivity equations helps solve optimization problems that have a large number of design variables and a high degree of coupling between disciplines.

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