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Design of Silencer for Centrifugal Fan
KTH, School of Engineering Sciences (SCI).
2018 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The project consists of characterization of the sound from and simulations of a silencer for a centrifugal fan. The sound characterization consisted of 1/3 octaveband sound power meassurements and narrowband meassurements for both inlet and outlet sound. The measurements were conducted in a reverberation chamber. The sound power from the outlet was 5 dB to 10 dB larger than from the inlet, with the largest difference between 80 Hz and 400 Hz. In the simulations the performance of a silencer based on the so called Cremer impedance were investigated. Simulations show up to 20 dB dampening at low frequencies, with rapidly decreasing performance at higher frequencies.

Abstract [sv]

Projektet  består  av  karakterisering  av  ljudet  från  och  undersökning av  en  ljuddampare till  en  centrifugalfläkt.   Karekteriseringen  bestod  av 1/3  oktavbandsmätning  av ljudeffekten  och  smalbandsmätning  av  både in- och  utloppsljud.  Mätningarna genomfördes  i efterklangsrum.  Ljudeffekten  från  utloppet  var  5  dB  -  10  dB  högre  än  den  från  inloppet,  med den  största  skillnaden  mellan  80  Hz  och  400  Hz.   I  simuleringarna  undersöktes prestationen av en ljuddämpare baserad på den så kallade Cre-merimpedansen.   Simuleringarna  visar  på  upp  till  20  dB  dämpning  vid låga frekvenser, och snabbt avtagande prestanda mot högre frekvenser.

Place, publisher, year, edition, pages
2018. , p. 19
Series
TRITA-SCI-GRU ; 2018-108
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-231724OAI: oai:DiVA.org:kth-231724DiVA, id: diva2:1229744
Supervisors
Examiners
Available from: 2018-07-02 Created: 2018-07-02 Last updated: 2018-07-02Bibliographically approved

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