Browsing by Subject "laminated plate"

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Access status: Open Access ,
Modelling of matrix degradation in piezocomposite actuators using graded material approximation
(Wydawnictwa AGH, 2009) Pietrzakowski, Marek
The work deals with modelling of material degradation in piezoelectric fiber composite (PFC) layers, which operate as actuators in active laminated plates. The considered degradation process concerns reduction of the matrix material stiffness and is described based on the functionally graded material approach. It is assumed that distribution of the matrix damage, which develops at the outer surface of the actuator layer and progresses toward its inner part, can be approximated according to a power function. The dynamic analysis and calculations are focused on changes in the natural frequencies and amplitude-frequency characteristics of the active laminated plate depending on the degradation level.
Access status: Open Access ,
Vibration control of functionally graded piezoelectric plates
(Wydawnictwa AGH, 2007) Pietrzakowski, Marek
The study develops the modelling of active laminated plates with homogeneous piezopolimer sensor layers and newly proposed piezoelectric functionally graded actuator layers. In the considered model the transverse distribution of electromechanical properties is defined by a variation of the PZT ceramic constituent, which is described by the exponential function. The effective electromechanical properties of the composite are obtained based on the rule of mixtures. The governing equations for laminated plates are formulated. The control strategy is based on the constant gain velocity feedback. The effects of the applied distribution of piezoceramic fraction within the actuator layers on the structural response of the plate including changes in the natural frequencies and reduction of the resonant amplitudes are numerically examined.