'Anti-noise' silences wind turbines

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The round vibration exciter (left) suspended from a crane induces vibrations in the rectangular iron platform that are similar to those of a wind energy converter. The active damper -- located at the center of the platform -- reduces these vibrations ...
The round vibration exciter (left), suspended from a crane, induces vibrations in the rectangular iron platform that are similar to those of a wind energy converter. The active damper -- located at the center of the platform -- reduces these vibrations. (c) Fraunhofer IWU
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If wind energy converters are located anywhere near a residential area, they must never become too noisy even in high winds. Most such power units try to go easy on their neighbors' ears, but even the most careful design cannot prevent noise from arising at times: One source is the motion of the rotor blades, another is the cogwheels that produce vibrations in the gearbox.


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