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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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A Study on the Noise Reduction of the Engine Cooing Fan of a Express Bus by Modification of Design Parameters

설계 파라미터 변경에 의한 고속 버스용 엔진 냉각 홴의 저소음화 연구

  • 이유엽 (한양대학교 자동차공학과) ;
  • 조용구 (한양대학교 대학원 자동차공학과) ;
  • 이충휘 (한양대학교 대학원 자동차공학과) ;
  • 오재응 (한양대학교 자동차공학과)
  • Published : 2003.04.01
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Abstract

This paper suggests the noise reduction method of the engine cooling fan. The fan noise contribution to the OASPL of engine room was estimated and the noise source was identified for the rotating fan by sound intensity method. And the program for Predicting the noise spectrum of axial flow fan was also developed. The radiated acoustic pressure is expressed in terms of discrete frequency noise Peaks at BPF and its harmonics and the line spectrum at the broad band by the proposed noise generation mechanisms. In this Paper, it Is shown that the comparison of the measured and calculated noise spectra of fan validates the noise predicting program. And this paper presents the characteristics of the fan noise in order to modify the design parameters. Accordingly, the design parameters were determined for the noise reduction of the fan.

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References

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