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Meteorological effects on the noise reducing performance of a low parallel wall structure

(2017) APPLIED ACOUSTICS. 121. p.74-81
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Abstract
Numerical calculations, scale model experiments and real-life implementations have shown that the insertion of a closely spaced array of low parallel walls of finite dimension beside a road is potentially useful for road traffic noise abatement. However, previous studies did not consider atmospheric effects. In this work, numerical techniques have been used to predict the sound reduction provided by a low parallel wall structure, subject to wind and temperature related atmospheric effects. Three full-wave prediction schemes show very good agreement when looking at the insertion loss of a low 6 m wide parallel wall structure, consisting of 24 regularly spaced 0.2-m high rigid walls. Meteorological effects are predicted not to deteriorate the insertion loss (relative to rigid flat ground) of the parallel wall array in the low frequency range. However, at high sound frequencies the insertion loss is strongly reduced by downward refraction at a distance of 50 m in case of strong wind. Consequently, overall A-weighted road traffic noise insertion loss will be significantly lower during wind episodes. Although weak turbulence does not alter the energy time-averaged insertion losses, strong turbulence reduces the noise shielding in the high frequency range also. As with conventional noise walls, when considering use of low parallel wall structures for noise reduction outdoors, even at short distances, atmospheric effects should be considered. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
OUTDOOR SOUND-PROPAGATION, ATMOSPHERIC-TURBULENCE, FINITE-DIFFERENCE, SURFACE-WAVES, REDUCTION, SIMULATION, EQUATIONS, MODEL, FDTD, Outdoor sound propagation, Low parallel walls, Turbulence, Refraction of, sound, Road traffic noise, Ground effects

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Citation

Please use this url to cite or link to this publication:

MLA
Van Renterghem, Timothy et al. “Meteorological Effects on the Noise Reducing Performance of a Low Parallel Wall Structure.” APPLIED ACOUSTICS 121 (2017): 74–81. Print.
APA
Van Renterghem, T., Taherzadeh, S., Hornikx, M., & Attenborough, K. (2017). Meteorological effects on the noise reducing performance of a low parallel wall structure. APPLIED ACOUSTICS, 121, 74–81.
Chicago author-date
Van Renterghem, Timothy, Shahram Taherzadeh, Maarten Hornikx, and Keith Attenborough. 2017. “Meteorological Effects on the Noise Reducing Performance of a Low Parallel Wall Structure.” Applied Acoustics 121: 74–81.
Chicago author-date (all authors)
Van Renterghem, Timothy, Shahram Taherzadeh, Maarten Hornikx, and Keith Attenborough. 2017. “Meteorological Effects on the Noise Reducing Performance of a Low Parallel Wall Structure.” Applied Acoustics 121: 74–81.
Vancouver
1.
Van Renterghem T, Taherzadeh S, Hornikx M, Attenborough K. Meteorological effects on the noise reducing performance of a low parallel wall structure. APPLIED ACOUSTICS. Oxford: Elsevier Sci Ltd; 2017;121:74–81.
IEEE
[1]
T. Van Renterghem, S. Taherzadeh, M. Hornikx, and K. Attenborough, “Meteorological effects on the noise reducing performance of a low parallel wall structure,” APPLIED ACOUSTICS, vol. 121, pp. 74–81, 2017.
@article{8534315,
  abstract     = {Numerical calculations, scale model experiments and real-life implementations have shown that the insertion of a closely spaced array of low parallel walls of finite dimension beside a road is potentially useful for road traffic noise abatement. However, previous studies did not consider atmospheric effects. In this work, numerical techniques have been used to predict the sound reduction provided by a low parallel wall structure, subject to wind and temperature related atmospheric effects. Three full-wave prediction schemes show very good agreement when looking at the insertion loss of a low 6 m wide parallel wall structure, consisting of 24 regularly spaced 0.2-m high rigid walls. Meteorological effects are predicted not to deteriorate the insertion loss (relative to rigid flat ground) of the parallel wall array in the low frequency range. However, at high sound frequencies the insertion loss is strongly reduced by downward refraction at a distance of 50 m in case of strong wind. Consequently, overall A-weighted road traffic noise insertion loss will be significantly lower during wind episodes. Although weak turbulence does not alter the energy time-averaged insertion losses, strong turbulence reduces the noise shielding in the high frequency range also. As with conventional noise walls, when considering use of low parallel wall structures for noise reduction outdoors, even at short distances, atmospheric effects should be considered. (C) 2017 Elsevier Ltd. All rights reserved.},
  author       = {Van Renterghem, Timothy and Taherzadeh, Shahram and Hornikx, Maarten and Attenborough, Keith},
  issn         = {0003-682X},
  journal      = {APPLIED ACOUSTICS},
  keywords     = {OUTDOOR SOUND-PROPAGATION,ATMOSPHERIC-TURBULENCE,FINITE-DIFFERENCE,SURFACE-WAVES,REDUCTION,SIMULATION,EQUATIONS,MODEL,FDTD,Outdoor sound propagation,Low parallel walls,Turbulence,Refraction of,sound,Road traffic noise,Ground effects},
  language     = {eng},
  pages        = {74--81},
  publisher    = {Elsevier Sci Ltd},
  title        = {Meteorological effects on the noise reducing performance of a low parallel wall structure},
  url          = {http://dx.doi.org/10.1016/j.apacoust.2017.01.029},
  volume       = {121},
  year         = {2017},
}

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