Acoustically resistive multi-component layer for a sound...

G - Physics – 10 – K

Patent

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Details

G10K 11/168 (2006.01) B32B 5/26 (2006.01) B32B 15/14 (2006.01) B64C 1/40 (2006.01) G10K 11/172 (2006.01)

Patent

CA 2425364

The invention concerns a multi-component acoustically resistive layer for acoustical attenuating panels having a cellular core (1) flanked on the sound wave arrival side by an acoustical damping layer (2) and, on the opposite side, by a rear reflector (3), characterized in that it comprises a first structural component (4) in contact with the aerodynamic flow and formed by at least one layer of fibres bound by a suitable resin and oriented in the direction of aerodynamic flow, the said component (4) comprising a suitable quantity of open surface; a dissipating component (6) disposed against the surface of the first component (4) opposite the flow, formed by a metallic cloth; and a second structural component (7) formed by at least one layer of fibres bound by a suitable resin, oriented orthogonally to the direction of aerodynamic flow, the said second structural component (7) being bound to the cellular core (1) and comprising a suitable open surface quantity.

- L'objet de l'invention est une couche acoustiquement résistive multicomposant, pour panneau d'atténuation acoustique du type constitué d'une âme alvéolaire (1) flanquée, côté onde sonore incidente, d'une couche d'amortissement acoustique (21 et, du côté opposé, d'un réflecteur arrière (3), caractérisée en ce qu'elle est constituée d'une première composante structurale (4) en contact avec l'écoulement aérodynamique et formée d'au moins une couche de fibres liées par une résine appropriée et orientées selon la direction de l'écoulement aérodynamique, ladite composante (4) comportant un taux de surface ouverte approprié ; d'une composante dissipatrice (6) disposée contre la face de ladite première composante (4) opposée audit écoulement, formée d'un tissu métallique ; et d'une seconde composante structurale (7) formée d'au moins une couche de fibres liées par une résine appropriée, orientées orthogonalement à ladite direction d'écoulement aérodynamique, ladite seconde composante structurale (7) étant liée à ladite âme alvéolaire (1) et comportant un taux de surface ouverte approprié.

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