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New measurement technique for ground acoustic impedance in wind farm

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  • Nyborg, Camilla Marie
  • Shen, Wen Zhong

Abstract

Ground acoustic impedance is important in the prediction of sound propagation. In this paper, a new measurement technique is developed based on the Image Source method. Two set-ups are used. Set-up 1 consists of a speaker at a height of 0.5 m and two microphones at heights of 0.2 m (or 0.3 m) and 0.5 m with a separation distance of 1.75 m between the speaker and microphones. Set-up 2 has a double separation distance and almost double heights of 0.5 m and 1 m. The impedance measurements were performed at grass-ground and soft soil-ground after harvest in two different wind farms in Denmark. The findings are: (1) The Nordtest method works in Set-up 1, but gives inconsistent results in Set-up 2. (2) The new method gives consistent results in both set-ups. (3) The flow resistivity obtained with an impedance model can only be used with that specific impedance model, and it becomes inaccurate when used with other impedance models. (4) The determination procedure of flow resistivity is suggested to work with any impedance model. (5) A relation between the flow resistivity obtained with the one-parameter model of Delany and Bazley and that obtained with the four-parameter model of Attenborough is derived.

Suggested Citation

  • Nyborg, Camilla Marie & Shen, Wen Zhong, 2021. "New measurement technique for ground acoustic impedance in wind farm," Renewable Energy, Elsevier, vol. 164(C), pages 791-803.
    • Handle: RePEc:eee:renene:v:164:y:2021:i:c:p:791-803
    DOI: 10.1016/j.renene.2020.09.095
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    Cited by:

    1. Cao, Jiufa & Nyborg, Camilla Marie & Feng, Ju & Hansen, Kurt S. & Bertagnolio, Franck & Fischer, Andreas & Sørensen, Thomas & Shen, Wen Zhong, 2022. "A new multi-fidelity flow-acoustics simulation framework for wind farm application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 156(C).
    2. Jiaying Wu & Jing Wang & Zhenye Sun & Wei Jun Zhu & Wen Zhong Shen, 2022. "Determination of the Parameters of Ground Acoustic-Impedance in Wind Farms," Sustainability, MDPI, vol. 14(23), pages 1-17, November.
    3. Mittal, Prateek & Christopoulos, Giorgos & Subramanian, Sriram, 2024. "Energy enhancement through noise minimization using acoustic metamaterials in a wind farm," Renewable Energy, Elsevier, vol. 224(C).

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