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A Study of Dynamic Properties of Delaminated Composite Beams with Piezoelectric Sensors and Actuators
Chang, Rong Ming
The main goal of this study is to investigate the dynamic characteristicsof both intact and delaminated composite beams using piezoelectric sensors andactuators. First, by employing the Hamilton's principle in conjunction with the finiteelement method, the equations of motion of composite beams containing delaminationand sensor equations are obtained. Next, the frequencies of composite beams havingdifferent types of delamination are analyzed. The results obtained here agree verywell with those published in the literature. To perform the frequency responseanalysis using piezoelectric sensors and actuators, the equations of modal equationsof motion. Afterwards, the modal equations and sensor equations are put into astate-space form which is then used to construct the transfer function matrix of the beam system. Numerical examples are given where frequency responses of various types of delaminated composite beams are studied using the transfer function matrix beingdeveloped. Several important conclusions concerning the influence of delaminationlocations and sensors' locations on the sensors'output are drawn. Finally, compositebeam specimen with surface-mounted piezoelectric sensors and actuator are made,and modal tests are performed. Good correlation is found between the results obtained from experiments and from the present theoretical model.
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