A Viscoelastic Sandwich Finite Element Model for the Analysis of Passive,Active and Hybrid Structures |
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Authors: | Aurelio L Araújo Cristovao M Mota Soares Carlos A Mota Soares |
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Affiliation: | (1) IDMEC/IST, Technical University of Lisbon, Av. Rovisco Pais, 1049-001 Lisbon, Portugal |
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Abstract: | In this paper we present a finite element model for the analysis of active sandwich laminated plates with a viscoelastic core
and laminated anisotropic face layers, as well as piezoelectric sensor and actuator layers. The model is formulated using
a mixed layerwise approach, by considering a higher order shear deformation theory (HSDT) to represent the displacement field
of the viscoelastic core and a first order shear deformation theory (FSDT) for the displacement field of the adjacent laminated
anisotropic face layers and exterior piezoelectric layers. The dynamic problem is solved in the frequency domain with viscoelastic
frequency dependent material properties for the core. Control laws are also implemented for the piezoelectric sensors and
actuators. The model behaviour in dynamics is assessed with the few solutions found in the literature, including experimental
data, and a laminated composite active sandwich application is proposed. In this numerical application, velocity feedback
control law is implemented for active control, using co-located piezoelectric patch sensors and actuators. |
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