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Modeling and Control of Intelligent Flexible Structures
Final rept. 15 Jun 1990-14 Dec 1993
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
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The research effort reported here summarizes the issues and discoveries of a three year effort to examine the modeling and control of intelligent structures for aerospace applications. Intelligent structures or smart structures or more appropriately, active structures are defined here in a narrow sense as structures with highly integrated sensors and actuators piezoceramic elements in this case. The major control thrust is vibration suppression. The issues of interest are a is the complexity of a smart structure control system worth it, b how detailed must modeling be to produce effective results, and c does the choice of a control law make a significant difference on the response. The results show clearly that improved models and complex control strategies form the most effective combination. The results show three experimental examples which clearly indicate the usefulness and advantages of smart structures over conventional vibration suppression methodologies. In particular, active structures improve overall efficiency in cases involving both flexible and rigid body control. In addition, some tangent results on nonlinear control, control in the presence of uncertainties and control of thermoelastic systems are presented. Smart intelligent structure, Slewing, solar arrays, Antenna, Structural control, Nonlinear controller, Thermoelastic response, Critical speed control.
APPROVED FOR PUBLIC RELEASE