Haydar Uyanık

Active vibration control of a fully clamped laminated composite plate subjected to impulsive pressure loadings

In this numerical study vibrations of a fully clamped composite plate subjected to impulsive pressure loadings are controlled by using piezoelectric patches. Finite element methods are preferred for numerical solutions. For obtaining finite element model of the smart plate structure, semiloof shell finite element including piezoelectric effects is used. Mode summation method is used for reducing the degrees of freedom of the finite element model and state-space equations are obtained from the reduced finite element model for determining appropriate control strategies. Optimal linear quadratic regulator (LQR) approach has been used to determine the feedback gain matrix and vibrations of the plate suppressed successfully.

Active vibration control of a laminated composite plate subjected to blast load

Purpose – The purpose of this paper is to develop a structural vibration control system by using a state observer which estimates system states using displacements measured from sensors.Design/methodology/approach – Friedlanders exponential decay function is used for expressing the blast load model. A semiloof shell element is developed in order to account for piezoelectric effects. The composite plate is discretized by using the semiloof shell elements, and stiffness and mass matrices of the plate are obtained from the finite element model. In order to reduce the degrees of freedom of the finite element model, mode summation method is used with weighted modal vector including initial dominant modes in the dynamic behavior.Findings – The structural vibrations are suppressed successfully and in an optimal way by using a state observer control system which estimates system states using displacements measured from sensors.Originality/value – This paper shows, for the first time, that vibrations of a cantile...