- 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”
This material is the work of the author(s) indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.
The copyright of this material resides with the author(s). As part of its noncommercial effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations. Send queries to query/wind-watch.org.
|Wind Watch relies entirely
on User Funding