Active Vibration Control Of A Flexible Beam With Piezoelectric Actuator MFC

Vibration is a common phenomenon of nature, but in certain cases, the unnecessary vibration will cause varying degrees of damage, it affects operation of the instruments directly, reduces the working accuracy and efficiency of mechanical set, intensifies component wear, and even causes structural fatigue damage, which affects the safety of mechanical equipment and engineering facilities. Therefore, it is necessary to research the control of vibration. Because of its low stiffness and small damping, flexible components tend to be more easily affected by vibration. In this backdrop, this paper set the flexible cantilever beam as the research object, using the piezoelectric actuator which is made of MFC. Make theory and experimental research on the basis of theoretical analysis and computer simulation. The theory of active vibration control, the modal test and control technology and other knowledge related are refered to.Advanced and innovative material and structures are increasingly used in civil infrastructure applications. This paper presents results on active control of a flexible beam with piezoelectric actuator MFC. The MFC which is made of a piezoelectric composite is used as actuator. The beam cantilevered is made of E-glass fibers and resins. The dynamics model of the beam is established by the theory of Euler Bernoulli beam, and the modal analysis by finite element software and testing is used to determine the modal parameters of the system. With the result of that, the research of positive position feedback algorithm and phase lead compensation control algorithm are applied. The computer simulation and experiment verify the correctness of the study.The experimental results demonstrate that the proposed control methods can achieve effective vibration control of the beam. Further experiment results contrast draw the conclusion:the control algorithm of phase lead compensation has better actual effect, however positive position feedback control has better robustness.