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Article

An Energy Model for the Calculation of Room Acoustic Parameters in Rectangular Rooms with Absorbent Ceilings

1
Saint-Gobain Ecophon AB, Yttervägen 1, 265 75 Hyllinge, Sweden
2
Engineering Acoustics, Lund University, John Ericssons väg 1, 221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
Academic Editors: Nikolaos M. Papadakis, Massimo Garai and Stavroulakis Georgios
Appl. Sci. 2021, 11(14), 6607; https://doi.org/10.3390/app11146607
Received: 27 June 2021 / Revised: 13 July 2021 / Accepted: 15 July 2021 / Published: 18 July 2021
(This article belongs to the Special Issue Advances in Architectural Acoustics)
The most common acoustical treatment of public rooms, such as schools, offices, and healthcare premises, is a suspended absorbent ceiling. The non-uniform distribution of the absorbent material, as well as the influence of sound-scattering objects such as furniture or other interior equipment, has to be taken into account when calculating room acoustic parameters. This requires additional information than what is already inherent in the statistical absorption coefficients and equivalent absorption areas provided by the reverberation chamber method ISO 354. Furthermore, the classical diffuse field assumption cannot be expected to be valid in these types of rooms. The non-isotropic sound field has to be considered. In this paper, a statistical energy analysis (SEA) model is derived. The sound field is subdivided into a grazing and non-grazing part where the grazing part refers to waves propagating almost parallel to the suspended ceiling. For estimation of all the inherent parameters in the model, the surface impedance of the suspended ceiling has to be known. A method for estimating the scattering and absorbing effects of furniture and objects is suggested in this paper. The room acoustical parameters reverberation time T20, speech clarity C50, and sound strength G were calculated with the model and compared with calculations according to the classical diffuse field model. Comparison with measurements were performed for a classroom configuration. With regard to all cases, the new model agrees better with measurements than the classical one. View Full-Text
Keywords: room acoustics; calculation models; absorption; scattering; airflow resistivity room acoustics; calculation models; absorption; scattering; airflow resistivity
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MDPI and ACS Style

Nilsson, E.; Arvidsson, E. An Energy Model for the Calculation of Room Acoustic Parameters in Rectangular Rooms with Absorbent Ceilings. Appl. Sci. 2021, 11, 6607. https://doi.org/10.3390/app11146607

AMA Style

Nilsson E, Arvidsson E. An Energy Model for the Calculation of Room Acoustic Parameters in Rectangular Rooms with Absorbent Ceilings. Applied Sciences. 2021; 11(14):6607. https://doi.org/10.3390/app11146607

Chicago/Turabian Style

Nilsson, Erling, and Emma Arvidsson. 2021. "An Energy Model for the Calculation of Room Acoustic Parameters in Rectangular Rooms with Absorbent Ceilings" Applied Sciences 11, no. 14: 6607. https://doi.org/10.3390/app11146607

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