FIELD: transportation.
SUBSTANCE: group of inventions relates to versions of an air extractor for reducing wind throb in a vehicle. Air extractor includes a support having a first opening. A first flap pivotally mounted to the support frame in the first opening. First flap is displaceable between a fully outwardly open position, a fully inwardly open position and an intermediate closed position. Further, the flap is tuned to a resonance frequency of between 12 and 18 Hz, characteristic of the wind throb generated by the vehicle in which the air extractor is mounted.
EFFECT: reduced noise and vibration.
18 cl, 6 dwg
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