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A new method for the preliminary design of controlled space structures is presented. The method coordinates standard finite element structural analysis, multivariable controls, and nonlinear programming codes and allows simultaneous optimization of the structures and control 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 structural design variables and control design variables. The solution of the demonstration problem is an important step toward a comprehensive preliminary design capability for structures and control 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. Padula, Sharon L. and James, Benjamin B. and Graves, Philip C. and Woodard, Stanley E. Langley Research Center RTOP 506-43-41-01...
A new method for the preliminary design of controlled space structures is presented. The method coordinates standard finite element structural analysis, multivariable controls, and nonlinear programming codes and allows simultaneous optimization of the structures and control 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 structural design variables and control design variables. The solution of the demonstration problem is an important step toward a comprehensive preliminary design capability for structures and control 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. Padula, Sharon L. and James, Benjamin B. and Graves, Philip C. and Woodard, Stanley E. Langley Research Center NASA-TP-3130, NAS 1.60:3130 RTOP 506-43-41-01 CONTROL SYSTEMS DESIGN; LARGE SPACE STRUCTURES; MULTIDISCIPLINARY DESIGN OPTIMIZATION; OPTIMIZATION; SPACECRAFT CONTROL; SPACECRAFT DESIGN; SPACECRAFT STRUCTURES; WEIGHT REDUCTION; ACTUATORS; FEEDBACK CONTROL; FINITE ELEMENT METHOD; GEOSYNCHRONOUS ORBITS; NONLINEAR PROGRAMMING; STRUCTURAL ANALYSIS; STRUCTURAL DESIGN; SYNCHRONOUS PLATFORMS; TRUSSES; VIBRATION DAMPING