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Noise Source Analysis and Control for Two Axial-Flow Cooling Fans in Series

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Fluid-Structure-Sound Interactions and Control

Part of the book series: Lecture Notes in Mechanical Engineering ((LNME))

Abstract

The noise signature of two identical small axial-flow cooling fans in series was analyzed and a technique of synchronous averaging with time-base stretching was used to decompose the raw sound signals into various noise source components. Acoustic directivity measurements were conducted for the case of distorted inlet flow caused by a flat plate covering half of the circular inlet flow passage. The effects of the flat plate and the axial distance between the flat plate and the fan inlet were studied as well. It is found that the inlet flow distortion increases the total sound pressure level (SPL), random and rotary noise of the upstream fan a lot but it barely affects the rotary noise of the downstream fan. A flow straightener consisting of many small hexagons is mounted at the inlet of the upstream fan to reduce the adverse effect of the inlet flow distortion. The total SPL is reduced by 1.2 dB on average.

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References

  • Huang L (2003) Characterizing computer cooling fan noise. J Acoust Soc Am 114(6):3189–3200

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  • Huang L, Wang J (2005) Acoustic analysis of a computer cooling fan. J Acoust Soc Am 118:2190–2200

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  • Wang C, Zhang W, Huang L (2015) Noise source analysis and control for two axial-flow cooling fans in series. Fan Noise 2015, Lyon, France

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Author information

Authors and Affiliations

  1. Lab of Aerodynamics and Acoustics, HKU Zhejiang Institute of Research and Innovation, Shenzhen Institute of Research and Innovation, and Department of Mechanical Engineering, The University of Hong Kong, Hong Kong, China

    C. Wang, W. Zhang & L. Huang

  2. School of Energy and Power Engineering, Beihang University, Beijing, China

    W. Zhang

Authors
  1. C. Wang
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  2. W. Zhang
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  3. L. Huang
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Corresponding author

Correspondence to C. Wang .

Editor information

Editors and Affiliations

  1. Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen, China

    Yu Zhou

  2. Curtin University, Bentley, Australia

    A.D. Lucey

  3. The Hong Kong Polytechnic University, Hong Kong, China

    Yang Liu

  4. The University of Hong Kong, Hong Kong, China

    Lixi Huang

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© 2016 Springer-Verlag Berlin Heidelberg

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Wang, C., Zhang, W., Huang, L. (2016). Noise Source Analysis and Control for Two Axial-Flow Cooling Fans in Series. In: Zhou, Y., Lucey, A., Liu, Y., Huang, L. (eds) Fluid-Structure-Sound Interactions and Control. Lecture Notes in Mechanical Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-48868-3_9

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  • DOI: https://doi.org/10.1007/978-3-662-48868-3_9

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-662-48866-9

  • Online ISBN: 978-3-662-48868-3

  • eBook Packages: EngineeringEngineering (R0)

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