Paper number 343


Aditi Chattopadhyay1, Changho Nam1, and Youdan Kim2

1Department of Mechanical and Aerospace Engineering
Arizona State University
Tempe, AZ 852897-6106, USA
2Department of Aerospace Engineering
Seoul National University
Seoul, KOREA

Summary In this paper, the effects of delamination on the dynamic characteristics of a composite plate are investigated. The refined higher order theory is used to model the smart composite plate in the presence of delaminations. The theory accurately captures the transverse shear deformation through the thickness, which is important in anisotropic composites, particularly in the presence of discrete actuators and sensors and delaminations. Next, the detection of delamination is investigated using the Root Mean Square (RMS) values of the response of the composite plate subject to disturbances. An active control system is designed to minimize the effect of delamination. The pole placement technique is applied to design the closed loop system by utilizing piezoelectric actuators. Numerical results show that the RMS information can be used to find the exact location of the delamination. The controller designed makes the delaminated plate behave like a healthy plate model. The controller also reduces the magnitudes of RMS responses due to disturbance.
Keywords damage detection, delaminations, active vibration control, smart composite modeling.

Theme : Mechanical and Physical Properties ; Dynamic, Impact and crashworthiness

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