This paper, presented at the Noise-Con 2008 in Dearborn, MI discusses the limitations of Ray-Tracing software in predicting noise levels. Ray-tracing software is used to model noise levels on industrial wind turbines.

Many of the complaints in the UK relating to wind farm noise appear to be due to the amplitude modulation (AM) of the aerodynamic noise from the blades, sometimes referred to as "swish" or "thump". Dick Bowdler explores the existing evidence and summarizes how the totality of what people experience when listening to wind turbine noise is really dependent on operating modes, weather, and even the location of the listener with respect to the turbines and the wind.

Abstract of a paper to be presented before the NOISE-CON 2008 conference Dearborn, Michigan 2008 July 28-31

The Windfarm perception project shows that the sound of wind turbines causes relatively much annoyance. The sound is perceived at relatively low levels and is thought to be more annoying than equally loud air or road traffic. This may be caused by the swishing character of the sound or because at night it does not decrease in strength -which is usually the case for traffic noise. Also in this study more disturbance of sleep occurs at the highest sound levels that occurred in this study. ...In the WINDFARM perception project, supervised by Frits van den Berg, the perception was investigated of modern, tall wind turbines by Dutch residents. The study shows that sound from wind farms is an important disadvantage of wind energy which in itself is positively appreciated by a majority of the participants.

The Brownsville Diary: Entries of a noise log kept by a Brownsville, Wisconsin family living 3/4 miles east of South Byron in Fond Du Lac County, Wisconsin. The new wind turbines have just gone on line there.

The Brownsville Diary: Entries of a noise log kept by a Brownsville, Wisconsin family living 3/4 miles east of South Byron in Fond Du Lac County, Wisconsin. The new wind turbines have just gone on line there. This log covers the time period from Apr 28, 2008 to May 13, 2008.

These guidelines developed by sound experts, George W. Kamperman and Richard R. James, are included in a paper they will be presenting at the NOISE-CON 2008 conference in Dearborn, MI 2008 July 28-31.

Todd and Jill Stull filed a complaint for damages and injunctive relief against Gamesa and Allegheny Ridge Wind Farm LLC (Babcock and Brown) due to excessive noise, flicker and other nuisance that are causing irreparable harm to the Plaintiffs and robbing them of their enjoyment of their property. A portion of their filing is detailed below. The full filing can be downloaded from the link at the bottom of this page.

Testimony of Mr. Michael McCann, a certified general real estate appraiser with 28-years experience appraising residential and commercial property. Mr. McCann addresses the possible impacts of wind turbine development on residential properties located within 1500-feet of the turbines. His full testimony can be read by clicking on the link at the bottom of this page.