Information that Infigen is using from South Australia is information collected using G-weighting measurement designed to measure infrasound10hz to 20hz and not the1 -10 herz which is known to be harmful to human health.
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G weighting effectively puts a ceiling of about 55- 60 decibel on all sounds measured, the beach testing where the testing was done in a hole in the ground and a meter in the bottom with a cover over the top lacks common sense.
G weighting does not consider the total sound pressure, this is important because of harmonics, wind farm design engineers know as turbines get larger low frequency infrasound emissions increase, and that pulsing and harmonics is associated with poorly placed turbines in relation to people’s homes and places of work.
Constructive interference from the turbines combined with two or more turbines in a row is harmful to human health because of pulsing of sound pressure.
It has been claimed that changing the blades upwind instead of down wind of tower stopped low frequency sound problems, there is no evidence to support this.
There is swooshing sound associated with the compression of air because of different wind speeds across the face of the rotor, wind turbines also rumble, to control the turbines from over speeding the end of the blade is effectively like a plane’s prop in reverse thrust, and that is what it sounds like for hours on end.
Noel Dean Ballarat, Victoria
