Wind fence enclosures for infrasonic wind noise reduction

The Journal of the Acoustical Society of America
JohnPaul AbbottJeremy Webster

Abstract

A large porous wind fence enclosure has been built and tested to optimize wind noise reduction at infrasonic frequencies between 0.01 and 10 Hz to develop a technology that is simple and cost effective and improves upon the limitations of spatial filter arrays for detecting nuclear explosions, wind turbine infrasound, and other sources of infrasound. Wind noise is reduced by minimizing the sum of the wind noise generated by the turbulence and velocity gradients inside the fence and by the area-averaging the decorrelated pressure fluctuations generated at the surface of the fence. The effects of varying the enclosure porosity, top condition, bottom gap, height, and diameter and adding a secondary windscreen were investigated. The wind fence enclosure achieved best reductions when the surface porosity was between 40% and 55% and was supplemented by a secondary windscreen. The most effective wind fence enclosure tested in this study achieved wind noise reductions of 20-27 dB over the 2-4 Hz frequency band, a minimum of 5 dB noise reduction for frequencies from 0.1 to 20 Hz, constant 3-6 dB noise reduction for frequencies with turbulence wavelengths larger than the fence, and sufficient wind noise reduction at high wind speeds (3-6...Continue Reading

References

Feb 1, 2003·The Journal of the Acoustical Society of America·Z Charlie Zheng, Bee K Tan
Sep 30, 2003·The Journal of the Acoustical Society of America·Michael A H Hedlin, Richard Raspet
Nov 1, 2003·The Journal of the Acoustical Society of America·Michael A H HedlinGerald D'Spain
Jul 16, 2005·The Journal of the Acoustical Society of America·F Douglas Shields
Mar 19, 2008·The Journal of the Acoustical Society of America·Richard RaspetJeremy Webster
Dec 2, 2010·The Journal of the Acoustical Society of America·Jeremy WebsterWayne E Prather
Apr 12, 2011·The Journal of the Acoustical Society of America·Ying XuD K Wilson
Jan 10, 2012·The Journal of the Acoustical Society of America·Jiao YuJohnPaul Abbott

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Citations

Aug 4, 2015·The Journal of the Acoustical Society of America·JohnPaul Abbott, Richard Raspet
Jul 3, 2016·The Journal of the Acoustical Society of America·Nicolas DauchezStéphane Denis
Feb 3, 2018·The Journal of the Acoustical Society of America·Sipei ZhaoJacob Chia-Chun Liu
Jan 3, 2019·The Journal of the Acoustical Society of America·Sipei ZhaoJacob Chia-Chun Liu

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