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1

Active control of plates using functionally graded piezocomposite layers

Pietrzakowski M.

Mechanics and Mechanical Engineering

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2006

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Vol. 10, nr 1

117-125

EN

The paper is aimed at active suppression of flexural vibration of thin rectangular symmetrically laminated plates by means of piezoelectric sensor and actuator layers, which operate in a constant-gain velocity feedback. A new class of the actuator layer made of piezocomposite functionally graded material (FGM) and equipped with interdigitated surface electrodes (IDEs) is applied. A change of electromechanical properties through the actuator layer thickness is obtained by stacking laminae with the piezoceramic (PZT) fibers distributed according to the assumed variation of the PZT volume fraction. The effective material parameters are derived and partial differential equation of the active plate motion is formulated based on the classical laminated plate theory. The dynamic analysis refers to the steady-state vibration of the globally orthotropic plate. The results of numerical simulation show the distributions of both the effective piezoelectric constants and stiffness parameters in the thickness direction of the actuator layer, and also the effect of the applied functionally graded actuator on the plate dynamic response depending on the PZT fiber configuration.

2

Dynamic effects of material damping in active laminates reinforced with piezoceramic fibers

Pietrzakowski M.

Engineering Transactions

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2006

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Vol. 54, iss. 3

223-231

EN

In the paper rectangular, simply supported, laminated plates composed of classical fiber-reinforced layers and active layers of piezoelectric properties are under consideration. The aim of the study is to determine the influence of anisotropic passive damping on the active vibration reduction achieved and the sensitivity of the system to material axes' orientation of piezocomposite actuator layers. The effects of piezoceramic fiber direction and passive damping intensity are illustrated by means of the amplitude-frequency characteristics.

3

Wpływ rozmieszczenia włókien piezoelektrycznych na aktywne tłumienie drgań płyt laminowanych

Pietrzakowski M.

Czasopismo Techniczne. Mechanika

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2004

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R. 101, z. 5-M

293--301

PL

Praca stanowi rozwinięcie analizy aktywnego tłumienia drgań płyt laminowanych. Do realizacji celu sterowania zastosowano warstwy wykonawcze z piezokompozytu typu IDEPFC i warstwy pomiarowe piezopolimeru PVDF. Analiza dotyczy drgań ustalonych i wpływu orientacji osi właściwości materiałowych warstw aktywnych na efektywność sterowania, a szczególnie - zdolność układu do redukcji wybranych postaci drgań własnych. Przedstawiono także wpływ tłumienia materiałowego na reakcję dynamiczną aktywnego laminatu.

EN

The paper develops the analysis for active structural vibration suppression of laminated plates. The control purposes are realized by the Interdigitated Electrode Piezoelectric Fiber Composites (IDEPFCs) used as actuator layers co-operating with the piezopolymer (PVDF) sensor layers. The dynamic analysis concerns the steady-state vibration and the influence of the material axes orientation of the active layers on the control effectiveness and the capability to suppress selected vibration modes. The effects of the material damping consideration on the active laminate behaviour are also exposed.