Studies of the Vibration Control of the Composite Plates Involving the Rotational Acceleration Effect

• Main Authors: Nychee Jow, 卓迺智
• Other Authors: M. Y. Chang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/62504250224895580560

碩士 === 國立中興大學 === 機械工程學系 === 91 === Abstract The objective of this thesis is to design suitable digital controllers based on LQG theory that are used to suppress the vibration of the composite plates resulting from the rotational acceleration effect. The piezoelectric patches bonded on the surface of the plates are used as sensors and actuators. In the framework of LQG theory, three types of digital controllers are investigated. They are the regular LQG controller, the internal model based LQG controller and the LQG controller with an external disturbance force compensator. The control inputs of the regular and internal model based LQG controllers all consist of the feedback of the estimated states. But for the later one, an additional dynamic system with integral action is included to attenuate the disturbance of the system. The third one contains the feedforward and feedback control loops with a modal disturbance force observer. The modal disturbance force are estimated at each time interval in modal space and are regarded as additional state variables that are combined with the feedback of states to suppress the vibration. It is shown from computer simulations that the three types of digital controllers all are proven they can attenuate the vibration of the composite plates involving the rotational acceleration effect. The LQG controller with the external disturbance force compensator is more effective than the others because of the use of modal disturbance force observers that can estimate the disturbance and cancel it in the feedforward loop.