Abstract
Damping added by a poroelastic material on a vibrating plate is investigated. The goal is to understand dissipation mechanisms within the porous layer in order to optimize damping. This analysis is based on a 3-D finite element formulation including poroelastic elements. First, dissipated powers related to thermal, viscous and viscoelastic dissipation are explicited. Then a generic configuration (simply supported aluminium plate with a bonded porous layer and mechanical excitation) is studied. Thermal dissipation is found negligible. Viscous dissipation can be optimized as a function of air flow resistivity. It is the major phenomenon within glasswool materials, whereas viscoelastic dissipation is dominant for polymeric foams. Finaly, a model of equivalent plate is proposed. It includes shear in the porous layer and only viscoelasticity of the squeleton. Good results are found for foam materials.
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