Acoustical Treatments on Ventilation Ducts through Walls : Experimental Results and Novel Models
(2022) In Acoustics 4(1). p.276-296- Abstract
Sound reduction is complex to estimate for acoustical treatments on ventilation ducts through walls. Various acoustical treatments are available for ventilation ducts, including internal lining (absorption along the inner perimeter), external lagging (external sound insulation), silencer, and suspended ceilings. Previous studies have examined how silencers and the internal lining affect the sound transmission of ventilation ducts. However, there are few theories to predict the effect of external lagging in combination with ventilation ducts and how the total sound reduction is affected. This article aims to investigate different acoustical treatments and develop theoretical models when external lagging with stone wool is used to reduce... (More)
Sound reduction is complex to estimate for acoustical treatments on ventilation ducts through walls. Various acoustical treatments are available for ventilation ducts, including internal lining (absorption along the inner perimeter), external lagging (external sound insulation), silencer, and suspended ceilings. Previous studies have examined how silencers and the internal lining affect the sound transmission of ventilation ducts. However, there are few theories to predict the effect of external lagging in combination with ventilation ducts and how the total sound reduction is affected. This article aims to investigate different acoustical treatments and develop theoretical models when external lagging with stone wool is used to reduce flanking sound transmission via the surface area of ventilation ducts. Theoretical models are developed for external lagging and compared with measurement data. Measurements and theory are generally in good agreement over the third-octave band range of 100–5000 Hz. The developed models clarify that the distance closest to the wall has the main impact on sound reduction for a combined system with a wall and a ventilation duct. Suspended ceilings and silencers are found to be enough as acoustical treatments for certain combinations of ventilation ducts and walls. However, external lagging seems to be the only effective solution in offices and schools when a large ventilation duct passes through a wall with high sound reduction.
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- author
- Nilsson, Erik LU ; Ménard, Sylvain ; Hagberg, Delphine Bard LU and Vardaxis, Nikolaos Georgios LU
- organization
- publishing date
- 2022-03
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- breakin, breakout, external lagging, flanking sound transmission, sound reduction, ventilation duct
- in
- Acoustics
- volume
- 4
- issue
- 1
- pages
- 276 - 296
- publisher
- MDPI AG
- external identifiers
-
- scopus:85129276953
- ISSN
- 2624-599X
- DOI
- 10.3390/acoustics4010017
- language
- English
- LU publication?
- yes
- id
- 2247902a-bb2f-494e-b5e2-cf295b5ccec0
- date added to LUP
- 2022-07-08 11:04:11
- date last changed
- 2022-07-08 11:04:11
@article{2247902a-bb2f-494e-b5e2-cf295b5ccec0,
abstract = {{<p>Sound reduction is complex to estimate for acoustical treatments on ventilation ducts through walls. Various acoustical treatments are available for ventilation ducts, including internal lining (absorption along the inner perimeter), external lagging (external sound insulation), silencer, and suspended ceilings. Previous studies have examined how silencers and the internal lining affect the sound transmission of ventilation ducts. However, there are few theories to predict the effect of external lagging in combination with ventilation ducts and how the total sound reduction is affected. This article aims to investigate different acoustical treatments and develop theoretical models when external lagging with stone wool is used to reduce flanking sound transmission via the surface area of ventilation ducts. Theoretical models are developed for external lagging and compared with measurement data. Measurements and theory are generally in good agreement over the third-octave band range of 100–5000 Hz. The developed models clarify that the distance closest to the wall has the main impact on sound reduction for a combined system with a wall and a ventilation duct. Suspended ceilings and silencers are found to be enough as acoustical treatments for certain combinations of ventilation ducts and walls. However, external lagging seems to be the only effective solution in offices and schools when a large ventilation duct passes through a wall with high sound reduction.</p>}},
author = {{Nilsson, Erik and Ménard, Sylvain and Hagberg, Delphine Bard and Vardaxis, Nikolaos Georgios}},
issn = {{2624-599X}},
keywords = {{breakin; breakout; external lagging; flanking sound transmission; sound reduction; ventilation duct}},
language = {{eng}},
number = {{1}},
pages = {{276--296}},
publisher = {{MDPI AG}},
series = {{Acoustics}},
title = {{Acoustical Treatments on Ventilation Ducts through Walls : Experimental Results and Novel Models}},
url = {{http://dx.doi.org/10.3390/acoustics4010017}},
doi = {{10.3390/acoustics4010017}},
volume = {{4}},
year = {{2022}},
}