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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.

2

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.

3

Analytical expressions of effective constants for a piezoelectric composite reinforced with square cross-section fibres

Otero J., Bravo-Castillero J., Guinovart-Diaz R., Rodriguez-Ramos R., Maugin G. A.

Archives of Mechanics

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2003

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Vol. 55, nr 4

357-371

EN

The purpose of this paper is to present analytical expresiion of the effective elastic, piezoelectric and dielectric constants of reinforced piezoelectric composite materials with unidirectional fibers periodically distributed in a square matrix, as obtained by means of the "double asymptotic homogenization" method. The cross-section of the fibers is square. Each periodic cell of the medium is a binary piezoelectric composite wherein both phases are homogeneous piezoelectric materials with transversely isotropic properties. Comparison between the derived theoretical predictions of characteristic parameters and the existing experimental results shows a rather good agreement. The results obtained in the present paper were verified by means of the universal relations of Schulgasser. Numerical computation of the effective properties can be realized without difficulties.