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Resource Documents by Bowdler, Dick

Bowdler, Dick
Amplitude Modulation of Wind Turbine Noise 
A Review of the Evidence “Conclusions: It seems probable that there are two distinct mechanisms in operation to create amplitude modulation. The first is swish which is a function of the observer’s position relative to one turbine. The second is thump which is due to turbine blades passing through uneven air velocities as they rotate. In the second case the uneven air may be due to interaction of other turbines, excessive wind shear or topography. These two mechanisms are entirely . . . Complete article »

Bowdler, Dick
Letter from acoustic expert Dick Bowdler 
In a communication to Sue Sliwinski, Dick Bowdler explains why he recommends setbacks of over one mile for industrial grade wind turbines. Download original document: “Letter from acoustics specialist Dick Bowdler” Complete article »

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