Experimental investigations on the wind noise reduction of semi-spherical metal mesh windscreens

Publication Type:
Conference Proceeding
Citation:
25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling, 2018, 1 pp. 288 - 295
Issue Date:
2018-01-01
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© 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. All rights reserved. The accuracy of noise measurements in the presence of flow is affected by wind noise, which is the pseudo sound generated on the microphone by turbulent flow. In outdoor acoustic measurement, porous windscreens are usually installed on the microphones to reduce the wind noise. In strong windy conditions, an additional large secondary shell windscreen is used to further mitigate the wind effect. This paper performs a systematic experimental study of semi-spherical shell windscreens. The effects of the windscreen size, multi-layer windscreens and fabric coverings on both the wind noise reduction and insertion loss are investigated. For single-layer windscreens without coverings, the insertion loss is below 0.4 dB and the maximum wind noise reduction is achieved by the mid-sized windscreen of 20 cm diameter. Covering the single-layer windscreens with a thin and thick cloth is found to introduce additional 1.0 ~ 3.5 dB and 3.0 ~ 7.0 dB wind noise reduction, but also increases the insertion loss to 1.1 ~ 2.2 dB. The multilayer windscreens are found to be superior to the fabric coverings, improving the wind noise reduction while keeping the insertion loss small. The best performance is achieved by the five-layer windscreen, with an 18.2 dB wind noise reduction and a 0.6 dB insertion loss.
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