Wireless Vibration Control Of Laminated Structure Using Photostrictive Actuators

The traditional actuators require hard-wired connections to transmit the control signals. When the operating environments contain external electromagnetic field, often there is electromagnetic interference using the traditional electromechanical transducers. The optically driven distributed opto-electromechanical actuators were born to remedy this problem. Photostrictive actuator, which can directly turn light energy into mechanical energy, is a new promising photoactuation technique for active vibration control of flexible structures. Photonic control of flexible plates using discrete Photostrictive actuators is investigated.In this paper, Photostrictive elements are employed as structural actuators. This paper used the method of genetic algorithms to optimize the location and size of one and two pairs of actuators. We also have a deep research on the vibration control of different modes. Beam with different boundary condition is considered. The modal force index function, which has taken into account the mode number, the spatial distribution, and the dimension of the Photostrictive actuator, is established. A binary-coded GA was used to maximize the modal force index. Based on these results, a new definition of the light intensity is developed. The analytical solution shows the new control method can be more effective. On the other hand, the active vibration control of plate is considered. In this part we also use GA to optimize the location and size of one and two patches of actuators. Base on the responses from analysis of plate, we consider the method of using two patches of photostrictive actuators to control multiple vibration modes of the plate. Velocity feedback control and acceleration feedback are used in the active vibration control of plate. In order to improve the effectiveness of the vibration control for plate structure, this paper made some analysis of the linear quadratic regulator (LQR) control method, which chooses the vibration energy of the structure and the control signal energy for the object function. A binary-coded GA based improved LQR control scheme has been incorporated, which maximizes the closed loop damping while keeping the actuator electric field within limit. Analytical solutions and numerical results demonstrate that the use of strategically positioned actuator patches can effectively control the fundamental modes that dominate the structural vibration. It also shows that by properly positioned the actuators the system performance can be improved.