Procedure for verification of sound source coverage over façades according to the International Standard ISO 140-5

Sánchez Bote, José Luis and Pedrero González, Antonio and Gómez Alfageme, Juan José (2012). Procedure for verification of sound source coverage over façades according to the International Standard ISO 140-5. "Applied Acoustics", v. 73 (n. 9); pp. 977-985. ISSN 0003-682X. https://doi.org/10.1016/j.apacoust.2012.04.007.

Description

Title: Procedure for verification of sound source coverage over façades according to the International Standard ISO 140-5
Author/s:
  • Sánchez Bote, José Luis
  • Pedrero González, Antonio
  • Gómez Alfageme, Juan José
Item Type: Article
Título de Revista/Publicación: Applied Acoustics
Date: September 2012
ISSN: 0003-682X
Volume: 73
Subjects:
Freetext Keywords: ISO 140–5; Sound insulation; Façade; Loudspeaker directivity; Coverage requirements
Faculty: E.U.I.T. Telecomunicación (UPM)
Department: Ingeniería Audiovisual y Comunicaciones [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

This paper presents a new verification procedure for sound source coverage according to ISO 140?5 requirements. The ISO 140?5 standard applies to the measurement of façade insulation and requires a sound source able to achieve a sufficiently uniform sound field in free field conditions on the façade under study. The proposed method involves the electroacoustic characterisation of the sound source in laboratory free field conditions (anechoic room) and the subsequent prediction by computer simulation of the sound free field radiated on a rectangular surface equal in size to the façade being measured. The loudspeaker is characterised in an anechoic room under laboratory controlled conditions, carefully measuring directivity, and then a computer model is designed to calculate the acoustic free field coverage for different loudspeaker positions and façade sizes. For each sound source position, the method provides the maximum direct acoustic level differences on a façade specimen and therefore determines whether the loudspeaker verifies the maximum allowed level difference of 5 dB (or 10 dB for façade dimensions greater than 5 m) required by the ISO standard. Additionally, the maximum horizontal dimension of the façade meeting the standard is calculated and provided for each sound source position, both with the 5 dB and 10 dB criteria. In the last section of the paper, the proposed procedure is compared with another method used by the authors in the past to achieve the same purpose: in situ outdoor measurements attempting to recreate free field conditions. From this comparison, it is concluded that the proposed method is able to reproduce the actual measurements with high accuracy, for example, the ground reflection effect, at least at low frequencies, which is difficult to avoid in the outdoor measurement method, and it is fully eliminated with the proposed method to achieve the free field requisite.

More information

Item ID: 22678
DC Identifier: http://oa.upm.es/22678/
OAI Identifier: oai:oa.upm.es:22678
DOI: 10.1016/j.apacoust.2012.04.007
Official URL: http://www.sciencedirect.com/science/article/pii/S0003682X12000965
Deposited by: Memoria Investigacion
Deposited on: 25 Mar 2014 16:46
Last Modified: 21 Apr 2016 17:40
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