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Keywords: finite elements, piezoelectric actuators, viscoelastic material.

Summary

Viscoelastic sandwich composites are structures in which a viscoelastic layer is sandwiched between elastic layers, and are widely used in engineering applications in order to reduce vibration amplitude and noise. Using simultaneously viscoelastic and piezoelectric layers, we have a hybrid structure with an active-passive damping treatment.

In this work a simple and efficient finite element model for vibration analysis of active-passive damped multilayer sandwich plates, with a viscoelastic core sandwiched between elastic layers, including piezoelectric layers is developed. The elastic layers are modelled using the classic plate theory and the core is modelled using the Reissener-Mindlin theory. The finite element is obtained by assembly of N "elements" through the thickness, using specific assumptions concerning the displacement continuity at the interfaces between layers. The finite element model is a non-conforming triangular plate-shell element with 24 degrees of freedom for the generalized displacements, and one electrical potential degree of freedom for each piezoelectric element layer, which can be surface bonded or embedded in the laminate. To achieve a mechanism for the active control of the structural dynamics response, a feedback control algorithm is used, coupling the sensor and active piezoelectric layers. To calculate the dynamic response of active-passive damped multilayer sandwich plates structures, the Newmark method is considered. The frequency domain response is also calculated and compared with alternative solution [1]. Based on this formulation, a finite element code is implemented.

The present model is applied in the solution of some illustrative examples and the results are presented and discussed. From these results is observed that the present model is simple in formulation, effective in quality, and fast in solving the proposed problems.

References

1: A.L. Araújo, C.M. Mota Soares, C..A.Mota Soares, "Finite element model for bybrid active-passive damping analysis of anisotropic laminated sandwich structures", Journal of Sandwich Structures and Materials, (to appear).

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 91 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping, L.F. Costa Neves and R.C. Barros Paper 161 A Finite Element Model for the Analysis of Viscoelastic Sandwich Structures J. Moita^1,2, A. Araújo³, P. Martins¹, C.M. Mota Soares¹ and C.A. Mota Soares¹ ¹IDMEC/IST, Technical University of Lisbon, Portugal ²ISE, University of Algarve, Faro, Portugal ³ESTIG, Polytechnic Institute of Bragança, Portugal doi:10.4203/ccp.91.161 purchase the full-text of this paper Full Bibliographic Reference for this paper , "A Finite Element Model for the Analysis of Viscoelastic Sandwich Structures", in B.H.V. Topping, L.F. Costa Neves, R.C. Barros, (Editors), "Proceedings of the Twelfth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 161, 2009. doi:10.4203/ccp.91.161 Keywords: finite elements, piezoelectric actuators, viscoelastic material. Summary Viscoelastic sandwich composites are structures in which a viscoelastic layer is sandwiched between elastic layers, and are widely used in engineering applications in order to reduce vibration amplitude and noise. Using simultaneously viscoelastic and piezoelectric layers, we have a hybrid structure with an active-passive damping treatment. In this work a simple and efficient finite element model for vibration analysis of active-passive damped multilayer sandwich plates, with a viscoelastic core sandwiched between elastic layers, including piezoelectric layers is developed. The elastic layers are modelled using the classic plate theory and the core is modelled using the Reissener-Mindlin theory. The finite element is obtained by assembly of N "elements" through the thickness, using specific assumptions concerning the displacement continuity at the interfaces between layers. The finite element model is a non-conforming triangular plate-shell element with 24 degrees of freedom for the generalized displacements, and one electrical potential degree of freedom for each piezoelectric element layer, which can be surface bonded or embedded in the laminate. To achieve a mechanism for the active control of the structural dynamics response, a feedback control algorithm is used, coupling the sensor and active piezoelectric layers. To calculate the dynamic response of active-passive damped multilayer sandwich plates structures, the Newmark method is considered. The frequency domain response is also calculated and compared with alternative solution [1]. Based on this formulation, a finite element code is implemented. The present model is applied in the solution of some illustrative examples and the results are presented and discussed. From these results is observed that the present model is simple in formulation, effective in quality, and fast in solving the proposed problems. References 1 A.L. Araújo, C.M. Mota Soares, C..A.Mota Soares, "Finite element model for bybrid active-passive damping analysis of anisotropic laminated sandwich structures", Journal of Sandwich Structures and Materials, (to appear). purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £140 +P&P)
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