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Inaudible noise of wind turbines  

Author:  | Health, Human rights, Noise

  • Number of wind turbines and their size are constantly growing
  • Wind turbines and wind farms generate strong infrasonic noise which is characterized by their blade-passing harmonics (monochromatic signals)
  • Generated noise of wind turbines can theoretically be estimated
    • geometrical spreading ≈ R−1
    • SPL ≈ rpm4
  • Recordings from field measurements near a single wind turbine show that the theoretical model is also valid for frequencies below a few Hz
  • Minimum distance between an infrasound array and a wind farm can be estimated to avoid reduction of the array’s detection capability (e.g. 600MW wind turbine: d >15 km, 11-element wind farm: d >30 km)

Presented at the Infrasound Workshop, November 28 – December 02, 2005, Tahiti
Lars Ceranna, Gernot Hartmann, and Manfred Henger
Federal Institute for Geosciences and Natural Resources (BGR), Section B3.11, Stilleweg 2, 30655 Hannover, Germany

Download original document: “The inaudible noise of wind turbines

Download German paper: “Der unhörbare Lärm von Windkraftanlagen – Infraschallmessungen an einem Windrad nördlich von Hannover”

This article is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

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