| Summary: | 碩士 === 國立中興大學 === 機械工程學系 === 86 === ABSTRACT The aim of this study is to design a digital
controller to suppress the vibration of a laminated composite
beam. The controller is designed according to the linear
quadratic Gaussian (LQG) control theory, and piezoelectric
materials are used as sensors and actuators. The controller is
then implemented in experiments to verify the validity of the
theory. The equations of motion and sensor equations
being used are those developed in reference [15] for delaminated
composite beams with piezoelectric sensors and actuators.
Firstly, they are transformed into a state-space form using
modal coordinates as its states. Then the LQG theory is
employed to design two kinds of the digital controller. The
first kind of the controller consists of a state feedback
control law and a prediction-type Kalman filter, while for the
second an additional feedfoward control law is added. In order
to find a suitable controller, computer simulations for control
systems are performed. The desired digital controller is then
implemented by a personal computer and the tests are carried
out. The experiment setup and test procedures are explained and
the influence of design parameters on control is evaluated. The
experiment results indicate that it is feasible to control the
vibration of composite beams using the controllers developed
herein.
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