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Noise mechanisms in motorcycle helmet noise


Reference:

Carley, M. J., Holt, N. J. and Walker, I., 2010. Noise mechanisms in motorcycle helmet noise. Journal of the Acoustical Society of America, 127 (3), p. 1777.

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Official URL:

http://dx.doi.org/10.1121/1.3383896

Abstract

A unique set of results on the acoustics of motorcycle helmets has been gathered during road tests on a rider wearing a representative modern helmet. The data were collected during a study of the noise which can cause hearing damage and, possibly, distraction in riders. They consisted of simultaneous measurements of noise at the rider’s ear and unsteady pressure on the helmet surface, combined with GPS measurements of rider position and speed. These signals have been analyzed to reduce the coherent structures in the turbulent flow responsible for noise generation. The identified structures appear to be produced by a vortex street shed by the motorcycle windscreen. The internal and external pressures proved to be poorly correlated over most of the frequency range, which has been identified as a result of the insertion loss of the helmet. The implications of these findings are that the majority of the variation in helmet noise is a function of such extrinsic factors as motorcycle configuration and rider build and posture. Efforts to reduce the harmful effects of noise in motorcycling should, then, move to studying the whole system of rider, helmet, motorcycle, and external environment.

Details

Item Type Articles
CreatorsCarley, M. J., Holt, N. J. and Walker, I.
DOI10.1121/1.3383896
DepartmentsFaculty of Humanities & Social Sciences > Psychology
Faculty of Engineering & Design > Mechanical Engineering
Research CentresAerospace Engineering Research Centre
RefereedYes
StatusPublished
ID Code26784

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