Active Vibration Control Of The Beam Structure Based On PLZT Photostrictive Actuators

When using for active vibration control of flexible structures, the traditional actuators requirehard-wired connections to transmit the control signals, which could be influenced by externalelectromagnetic field and contaminate the control signals. These aspects affect the accuracy of thesignals transmission and the reliability of the vibration control. The lanthanum-modified leadzirconate titanate (PLZT) actuator exhibits large photostriction and superposition phenomenon ofphotovoltaic and piezoelectric effect under uniform illumination of high-intensity light. When laidingPLZT actuators on flexible structures, the bending control effects and the in-plane membrane controlforce will be produced, which could suppress the modal amplitude effectively. Hence, thephotostrictive actuators can work out the problem faced in structural vibration control using thetraditional electromechanical transducers, and have great potential in applications of remote structuralvibration control of smart structures and machines.The operating principle of photostrictive actuators is introduced, the modal and the vibrationdifferential equation of the beam laminated photostrictive actuators is established in this thesis. Anoptimization algorithm for the layout of the photostrictive actuators for active vibration control of thebeam is proposed. The control effect of multiple vibration modes of the beam under irradiation ofset/variable light intensity is analyzed. Numerical results demonstrate that the method is rational andefficient, and testify the rational magnitude of high-energy light and rational control gain couldimprove the effect of active vibration control. Last, a novel one-dimensional two-node shear-flexiblelayered composite beam element is proposed, and a numerical example is used to testified thefeasibility of the novel element. Based on the novel element, the finite element formulation ofcomposited beam laminated the photostrictive actuator is developed, the finite element simulation ofactive vibration control of the composited beam is analyzed. The results testify the use of PLZTactuators can effectively control the composited beams vibration. Worthly, the present approachconsiders the effect of photostrictive actuators on the inertial mass and effective stiffness of thestructures, and can promote the development of the finite element method of the wireless vibrationcontrol of the photostrictive actuators laminated flexible structures, and provide some valuablereference for theory and experiment research.