Browsing by Subject "modelowanie struktur"

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Access status: Open Access ,
Modelling and control of structure-acoustic interaction problems via piezoceramic actuators
(Wydawnictwa AGH, 2005) Leniowska, Lucyna
Active control of vibration suppression of a circular fluid-loaded plate is analytically studied. The purpose of this theoretical work is to present a general model of a planar vibrating structure located in a finite baffle and interacted with fluid as well as its time response on harmonic excitation when a control strategy is applied. The structure under study is a vibrating circular plate of radius a, having a constant thickness h, to which centrally placed circular shaped piezoeleetric ceramic patches of radius a1 a are bonded. They are used to cancel the plate vibrations and related sound field when a controlling voltage is applied. It was assumed, that the plate clamped at the edge is excited on one side by a uniform periodic force with a constant amplitude F0 and it radiates the acoustic waves into a surrounded fluid of density Po. The control problem lies in using piezoceramic actuators working in a pair to reduce the plate vibrations. For the system under consideration the state-space model is constructed. The modern control theory is then applied to the system model using a linear quadratic regulator (LQR). The simulations of the active attenuation of the plate vibrations were made with a MATLAB/Simulink computer program, The results demonstrate that it is possible to achieve a significant reduction of the vibration amplitude with the use of a pair PZT actuators.