Permeable aerodam to reduce wind noise

Details Permeable aerodam to reduce wind noise Permeable aerodam to reduce wind noise

1997-07-18

2000-02-29

Dang, Khanh

Acoustics

Anatomic or prosthetic relation

Ear and mouth

2209, 2423, H04R 2500

Patent

active

060297697

ABSTRACT:
A permeable aerodam 10 is fastened to a front helmet strap 16 of a bicycle rider's helmet 18. The aerodam includes a shaped fiber filter 32 which is mounted on a base 36 and is designed to impede, but not arrest the motion of air flowing through it. The aerodam also includes a matrix 52 which includes the base and which shapes, supports, and locates the filter next to the temple area. A headwind experienced by the rider flows around the side of the head and partially through the aerodam such that an impedance gradient caused by the shaped filter will cause a quiet retrolaminar flow velocity profile 92 alonside the rider's ear canal. The effect eliminates the onset of noisy turbulence heard by the rider while allowing unobstructed ambient sounds and ventilation to be enjoyed.

REFERENCES:
patent: 4370758 (1983-02-01), Mattheis
patent: 5086789 (1992-02-01), Tichy
patent: 5477564 (1995-12-01), Tichy

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