Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Investigation of noise generation inventilation systems
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The ventilation systems are becoming more compact so as to save buildings space. In return, the velocity, in ventilation units, is increased and the air flows are also more turbulent. The hotwire investigation aims to correlate this increase of turbulence with the increase of the noise level. The investigation was done for industrials purposes and is based on empirical researches completed with theoretical knowledge. For the investigation, the hotwire sensor is chosen for its ability to detect small velocity fluctuations at high frequency. Two different prototypes are designed in order to highlight the influence of the turbulence level in the sound generation, especially at ventilation outlets. A procedure is also introduced, in which the hotwire is used for the turbulence measures and a reverberation room for the sound measurement. General conclusions are finally identified and explain the influence of the turbulence in the sound generation mechanisms. The influence of the prototypes geometries, on both the sound and the turbulence, is analyzed and the master thesis describes how the air flow velocity in ducts and the static pressure could modify both the turbulence and the sound levels.

The stated conclusions imply that the designers of new ventilation systems should take into account the turbulence generated by their experimental product if they want to conserve good sound properties.

Place, publisher, year, edition, pages
2012. , 100 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2012:82
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-119699OAI: oai:DiVA.org:kth-119699DiVA: diva2:612207
Uppsok
Technology
Examiners
Available from: 2013-03-20 Created: 2013-03-20 Last updated: 2013-03-20Bibliographically approved

Open Access in DiVA

fulltext(4114 kB)192 downloads
File information
File name FULLTEXT01.pdfFile size 4114 kBChecksum SHA-512
24b4adb01a2c64acd0dce26b06156e8a0fd1af233a04071303a3b748ec01cc49fb1b59dcc152ffce4ae3364e6480ee3553a2a15dd6ac8179d110aaf68b962763
Type fulltextMimetype application/pdf

By organisation
Marcus Wallenberg Laboratory MWL
Applied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 192 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 87 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf