Abstract
Active vibration control of a cylindrical shell partially covered by a laminatedPVDF actuator (LPA) is studied. The electromechanically coupled equationsof the system are derived considering the influences of the bonding layers. Theanalytical expressions of the control forces induced by the LPA are obtained andthereafter a parametric study is conducted to evaluate the effects of the physicalproperties of the actuator on the control forces. The active vibration control ofa clamped–free cylindrical shell using an LPA with different layer numbers issimulated and carried out experimentally. It shows that the control forces of theactuator can be significantly enhanced by increasing the PVDF layer number whilekeeping the driving voltage unchanged. As a result, the modal vibrations of theshell are suppressed quite well (the vibration amplitude is cut by 64.08%) under arelatively low control voltage (40 V) with a five-layer LPA whose area is only 0.21%of that of the shell. Additionally, as the LPA partially covers the shell surfacealong the circumferential direction, it can exert a radial actuating force on thestructure except for the actuating moment, and the former is much larger thanthe latter and is thus preferable for controlling the structural radial vibration.To make full use of this actuating force, the actuator should not be placed at apoint of large surface strain as is usual but at one of large radial deformation.
Published Version
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