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Justification of standardized level differences in rating of airborne sound insulation between dwellings

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)12-18
JournalApplied Acoustics
Volume102
Early online date11 Sep 2015
DOIs
Publication statusPublished - 2016
Publication typeA1 Journal article-refereed

Abstract


It has long been recognized that single-number quantities R'(W), D-nT,D-W or D-n,D-w result in different conclusions in objective rating of airborne sound insulation between dwellings. The difference between the values of these single-number quantities (SNQ), however, does not prove which of them describes the sound transmission between rooms most correctly. The main object of this article was to study which SNQ correspond best with transmitted living sound levels in buildings when reverberation time, volume of receiving room and sound insulation are taken into account. Data of 100 field measurements of airborne sound insulation were collected as well as 207 reverberation times of furnished rooms. The transmitted sound levels of living sounds were evaluated on the basis of known living sound spectra and measured level differences D. The results show that the SNQs standardized to reference reverberation time of 0.5 s lead in all cases to best correlation between the SNQs and the sound levels of transmitted living sounds. It was also checked whether the rating by D-nT,D-W would lead to higher transmitted sound levels of living sounds in larger rooms, but this was not detected. The use of D-nT,D-W makes rooms of different volumes equal in regard to required sound insulation between them. It is thus justified to replace R'(w) with D-nT,D-W as the SNQ for rating the airborne sound insulation. Widening the frequency range down to 50 Hz or up to 5000 Hz did not give noteworthy improvement in the correlation. (C) 2015 Elsevier Ltd. All rights reserved.

ASJC Scopus subject areas

Keywords

  • Absorption area, Airborne sound insulation, Building acoustics, Reverberation time

Publication forum classification

Field of science, Statistics Finland