The modeling and shape control problem of space intelligent truss structure with piezoelectric actuators (PZT actuators) is studied in this paper. The basic unit of intelligent truss structure is firstly divided into PZT bar element and normal bar element, and their dynamic models are developed respectively. Then, the dynamic model of the structure is reduced using the modal truncation method, and is transformed into the state space form. The target voltage values for the PZT actuators to correct the deformation of the structure are estimated according to the dynamic model. The vibration will be caused during shape correction since the space intelligent truss is inherently flexible. The optimal input voltage profile of PZT actuators is proposed by minimizing vibration amplitude during the shape control and the optimal control problem is solved utilizing the nonlinear programming method. Simulation results are finally provided to illustrate the performance of the proposed model and controller. Using optimal control techniques appears to provide a promising solution to correct the deformed shape of the structure, as well as minimum residual vibration for space intelligent truss structure.
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