Study On Vibration Active Control Technology Based On Piezoelectric Self- Sensing Actuator

With the rapid development of aviation industry, lots of flexible structures such as solar panels to be used in a variety of air vehicles. However, flexible structures which are of high defection and low damping can generate continuous vibration under external force. In the absence of air damping in the space environment, the structural vibration is difficult to stop and cause resonance easily, which seriously affect the performance of the structure. So the vibration control over the structures is very important.Active vibration control which is of high control accuracy and strong adaptive capacity is widely used in structural vibration control. The same bit allocation and other issues of sensors and actuators are difficult to solve in traditional control systems. Most control methods which are based on modern control theory require higher mathematic model accuracy and adopt complex control algorithms, which can not respond quickly to the vibration of the system.Based on the historical information of the control system and selected control input, the predictive functional control algorithm make predictions of the process output control sequence within future certain period. The algorithm is a new control algorithm which doesn't need controlled objects accurate mathematical model. Because most of the control parameters in predictive functional control algorithm can be calculated off-line, the new algorithm reduces the online computation of the system and improve real-time responsiveness of the system.In this paper, active vibration control technology based on predictive functional control method is studied. The flexible cantilever beam is seen as control object, the state space equation of the cantilever beam system is established with modal analysis. Then, the state space equation of vibration system, which is dispensed, is seen as the prediction model. The optimal control law is attained after rigorous theoretical analysis and a series of calculation. Finally, the open and closed loop simulation of the designed control system is done. The results show the system vibration is very slow decay relying on its own damping. However, when the system enter control action, the vibration of the piezoelectric cantilever beam is quickly suppressed and the control effect is better to achieve the desired control purposes.