Research Article Building Thermal, Lighting, and Acoustics Modeling
In order to dissipate sound which passes through an open awning window, we have developed a hybrid absorber made of a modified Helmholtz resonator with perforated foam. Generally, acoustic absorbers are divided into two major categories. The first one is porous materials which dissipate the acoustic wave in a visco-inertial form and heat. The second category is systems which absorb the energy of the acoustic wave by resonance. The aim of this work was to design a hybrid absorber which incorporates the benefits of the two categories for both high frequencies (conventional foam) and low frequencies (resonator). After describing the concept and the principles, we present the prototype which was built and tested under laboratory conditions between two reverberant rooms to attenuate the sound when an awning window is open. The prototype allows reduction of noise transmission (up to 6 dB) at low and high frequencies.
awning windows silencers sound absorption coefficient sound reduction index
This is a preview of subscription content, log in to check access.
This work was performed within the framework of the project OVI-SOLVE (ANR-11-VILD-0007) and in the framework of the LABEX CeLyA (ANR-10-LABX-0060) of Université de Lyon.
Allard JF, Atalla N (2009). Propagation of Sound in Porous Media, Modelling Sound Absorbing Materials, 2nd edn. Chichester, UK: John Wiley & Sons.Google Scholar
Beranek LL (1942). Acoustic impedance of Porous Materials. Journal of the Acoustical Society of America, 13: 248–260.CrossRefGoogle Scholar
Bernhard RJ, Hall HR, Jones JD (1992). Adaptive-passive noise control. In: Proceedings of Inter-Noise 92, Toronto, Canada, pp. 427–430.Google Scholar
Bolt RH (1947). On the design of perforated facings for acoustic materials. Journal of the Acoustical Society of America, 19: 917–921.CrossRefGoogle Scholar
Callaway DB, Remer LG (1952). The use of perforated facings in designing low frequency resonant absorbers. Journal of the Acoustical Society of America, 24: 309–312.CrossRefGoogle Scholar
Champoux Y, Allard JF (1991). Dynamic tortuosity and bulk modulus in air-saturated porous media. Journal of Applied Physics, 70: 1975–1979.CrossRefGoogle Scholar
Chanaud RC (1994). Effects of geometry on the resonance frequency of Helmholtz resonators. Journal of Sound and Vibration, 178: 337–348.CrossRefGoogle Scholar
Crocker MJ, Arenas JP (2007). Use of sound-absorbing materials. In: Crocker MJ (Ed), Hanbook of Noise and Vibration Control, Chapter 57. New York: John Wiley & Sons.CrossRefGoogle Scholar
Davern WA (1977). Perforated facings backed with porous materials as sound absorbers—An experimental study. Applied Acoustics, 10: 85–112.CrossRefGoogle Scholar
Gourdon E, Seppi M (2010). On the use of porous inclusions to improve the acoustical response of porous materials: Analytical model and experimental verification. Applied Acoustics, 71: 283–298.CrossRefGoogle Scholar
Griffin S, Lane SA, Huybrechts S (2000). Coupled Helmholtz resonators for acoustic attenuation. Journal of Vibration and Acoustics, 123: 11–17.CrossRefGoogle Scholar
Guignouard P, Meisser M, Allard JF, Rebillard P, Depollier C (1991). Prediction and measurement of the acoustical impedance and absorption coefficient at oblique incidenced of porous layers with perforated facings. Noise Control Engineering Journal, 36: 129–135.CrossRefGoogle Scholar
Ingard U (1953). On the theory and design of acoustic resonators. Journal of the Acoustical Society of America, 25: 1037–1061.CrossRefGoogle Scholar
Johnson DL, Koplik J, Dashen R (1987). Theory of dynamic permeability and tortuosity in fluid-saturated porous media. Journal of Fluid Mechanics, 176: 379–402.CrossRefzbMATHGoogle Scholar
Olny X, Boutin C (2003). Acoustical wave propagation in double porosity media. Journal of the Acoustical Society of America, 114: 73–89.CrossRefGoogle Scholar
Panneton R, Olny X (2006). Acoustical determination of the parameters governing viscous dissipation in porous media. Journal of the Acoustical Society of America, 119: 2027–2040.CrossRefGoogle Scholar
Rayleigh (1870). On the theory of resonators. Philosophical Transactions of the Royal Society, 161: 77–118.Google Scholar
Sgard F, Olny X, Atalla N, Castel F (2005). On the use of perforations to improve the sound absorption of porous materials. Applied acoustics, 66: 625–651.CrossRefGoogle Scholar
Tang SK (2005). On Helmholtz resonators with tapered necks. Journal of Sound and Vibration, 279: 1085–1096.CrossRefGoogle Scholar