Study On Active Vibration Control Of Smart Structures

Along with the technical development, the question of structure vibration controls becomes urgent problem. Smart structure appeared Following the vibration control research, Smart structure, an integration of sensors, actuators, microprocessors, and structural base materials together, is capable of recognizing, estimating and actuating. It can reduce the harmful vibration according to the characteristics of the controlled object, working environment and the control requirement. This article takes piezoelectric beam and piezoelectric plate as the study objects, uses mode control theory and the optimum control theory to study the question of smart structure vibration initiative control. In this paper using 3-degree-of-freedom beam element and 12- degree-of-freedom plate element, the dynamics formula is obtained on the basis of the constitutive equation and Hamilton's principle. By constructing a simplified model of the beam and plate in computer, every mode of vibration has been analyzed through finite element method on ANSYS platform. And on this foundation, using coupling mode control theory on the basis of LQR to control the vibration of the piezoelectric smart beam, and using independent mode control theory on the basis of LQR to control the vibration of the piezoelectric smart plate. Finally the study use MATLAB software to simulate the smart structure vibration control. The main contents are: (1) The study use MATLAB language to design dynamic export feedback controller of system, the study take the LQR algorithms; The study draw the figure of vibration control results of piezoelectric smart beam before control and after control, draw the control import and export figure, draw the comparison figure of actual state vector and observational state vector and draw the figure of tolerance of observation, draw the system response figure of different value Q and...