On the measurement and prediction of the sound absorption coefficient of air-cavity backed perforated plates considering the holes interaction effect under low sound excitation

Rostand Tayong (1) , Philippe Leclaire (2)

1 ISAT - Institut Supérieur de l'Automobile et des Transports
2 DRIVE - Département de Recherche en Ingéniérie des Véhicules pour l'Environnement

This paper deals with the measurement and prediction of air cavity backed perforated plates considering the holes interaction effect under relatively low sound excitation. A revised expression for the radiation contribution is proposed to properly account for the holes interaction effect. This expression is integrated in the characteristic impedance expression following Atalla and Sgard [J. Sound Vib. 303, 195-208 (2007)] model. Perforated plate specimens with different centre-to-centre holes distances (pitches) are built and tested using an impedance tube. The particular cases of holes interaction effect with constant low porosity and of holes interaction effect with variable high porosity are depicted and discussed in detail. For the case of constant low porosity, the resonance frequency is observed to decrease with the pitch. For the case of variable high porosity, the resonance frequency increases when the pitch diminishes.

Mots clés: Holes interaction; Sound absorption; perforated plate; excitation

Domaines: Acoustique [physics.class-ph]

Rostand Tayong, Philippe Leclaire. On the measurement and prediction of the sound absorption coefficient of air-cavity backed perforated plates considering the holes interaction effect under low sound excitation. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811063⟩