Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Noise Reduction of a Blower for an Automatic Car Washer by Using Dissipative Silencers

흡음형 소음기를 사용한 세차기용 원심송풍기의 소음저감에 관한 연구

  • 김재영 (전북대학교 기계공학과, 한국지엠) ;
  • 이일재 (전북대학교 기계공학과)
  • Received : 2011.05.24
  • Accepted : 2011.07.19
  • Published : 2011.08.20
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Abstract

Straight absorptive silencers have been designed to reduce the noise level of a centrifugal blower. Three-dimensional boundary element method is used for the design of absorptive silencers which consist of a perforated main pipe and a outer chamber filled with fibrous material. The experimental results show that the absorptive silencer reduces up to 8 dB(A) in the overall sound pressure level of the blower and up to 15 dB at the blade passing frequency. It is also found that the gap between the silencer and the impeller may substantially alter the acoustic performance of the silencers. The transmission loss predicted by the boundary element method follows overall trends of the measured insertion loss. The experiments also show that the impact of the silencers on the aerodynamic performance of the blower is minimum.

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References

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