Acoustic Engineering Investigation at Cape Bridgewater Wind Facility

A simplified explanation of the Findings, Previous Research and the Consequences….

Mothers Against Wind Turbines Inc.

Acoustic Engineering Investigation into Airborne and Ground-Borne Pressure Pulses from Pacific Hydro’s Wind Turbines at Cape Bridgewater

Waubra Foundation Definitive Document
1 February, 2015

A Simplified Explanation of the Findings, Previous Research, and the Consequences

1. Background

• Turbines create “waste energy” in the form of airborne pressure waves (sound) and ground-borne pressure waves (vibration).
• Noise is that part of the sound frequency spectrum which is audible, but “noise” is also defined by psychoacousticians as “unwanted sound”.
• The strength (sometimes expressed as a loudness in the case of noise) of the sound is measured in decibels (“dB”).
• The wavelength of individual sound waves is a measure of the distance between the peaks of the pressure waves. The speed of sound divided by the wavelength gives the frequency of the sound and is expressed in hertz (Hz).
• Where the frequency of the sound waves is below 20 Hz, the distance between the waves…

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