Maine acousticians Robert Rand and Stephen Ambrose release new study about infrasound and health effects

The DEP's "third party" noise expert, Warren Brown, has until now maintained that measurement of low frequency turbine noise is "preliminary and unrefined".  Studies like this should help Brown accept the mounting evidence that turbine noise causes Wind Turbine Syndrome and needs to be regulated accordingly.  

Cape Cod Online 

FALMOUTH — A study released last week concludes wind turbines in Falmouth negatively affect abutters' health.

The analysis was partially funded by a grant from Bruce McPherson, who opposes the Falmouth wind project and other turbine projects on Cape Cod. Its results assert that wind turbines cause "visceral" physical reactions and that sound waves from turbines are felt more intensely indoors than outside.

"We did not expect it," said Stephen E. Ambrose, a Maine environmental sound consultant who co-authored The Bruce McPherson Infrasound and Low Frequency Noise Study.

Ambrose declined to release the amount he was paid but said he and a partner each spent about 800 hours on the study.

Ambrose and Robert W. Rand, who also specializes in sound studies, conducted their research over three days in April, Ambrose said.

The two former employees of Stone & Webster Inc., a Stoughton engineering firm that designs and builds power plants, have conducted peer reviews on acoustics from turbines for several towns in Massachusetts, Maine and Wyoming.

For this study, Ambrose and Rand lived in a house near Blacksmith Shop Road for three days while measuring pressure originating from infrasound. They documented the intensity of sound frequencies from a privately owned turbine in the Falmouth Technology Park and how their bodies responded to it. The turbine studied is roughly the size of Falmouth's two municipal turbines.

When the two arrived at the house — located 1,700 feet from the turbine — on April 17, they began feeling effects within 20 minutes, according to the study. Both felt nausea, dizziness and anxiety, among other side effects.

They also reported having difficulty performing "normal activities" associated with the investigation, which included setting up instruments and observing measurements, the report states.

According to a chart included in the study, the discomfort and sick feelings intensified as wind speeds increased and the blades spun faster.

Previous sound studies that showed no negative health effects were done outdoors, Ambrose said. The recent study, which used low-frequency microphones to measure sound waves, showed sounds are more intense indoors than out. Data from this study showed a 10 dbG (a measurement for infrasound) increase outdoors and a 20 dbG increase indoors. The effect is similar to "living in a drum," he said.

An independent review of the acoustics data indicates it is scientifically valid, Nancy S. Timmerman, chairwoman of the Acoustical Society of America's Technical Committee on Noise, said in an email. She added that she can speak only to data on acoustics, not physiological effects reported in the study.

Jim Cummings, executive director of Acoustic Ecology Institute, another expert who looked at the study, said in an email the results could be a red flag on the correlation between infrasound and negative health effects, but more data are needed to establish proof.

"This is an indication, for sure, but a short sampling to base large claims on," Cummings wrote. "This and one other recent paper from the Association for Noise Control Engineers conference, Noise-Con, are both good indications that infrasound could be more problematic than generally assumed."

click the link to read the rest of the article...  http://www.capecodonline.com/apps/pbcs.dll/article?AID=/20111226/NE...

click here for a pdf of the actual study...http://randacoustics.com/wind-turbine-sound/the-bruce-mcpherson-ilf...