Carley, M., Holt, N. and Walker, I., 2010. Noise mechanisms in motorcycle helmet noise. Proceedings of Meetings on Acoustics, 9, 040005.
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 educe 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 variation in helmet noise is a function of such extrinsic factors as motorcycle configuration and rider build and position. 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.
|Item Type ||Articles|
|Creators||Carley, M., Holt, N. and Walker, I.|
|Departments||Faculty of Engineering & Design > Mechanical Engineering|
Faculty of Humanities & Social Sciences > Psychology
|Research Centres||Aerospace Engineering Research Centre|
|Publisher Statement||asa10a_Carley_et_al_2010.pdf: Copyright (2010) Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in (POMA Volume 9, Issue 1, pp. 040005-040005-11 (April 29, 2010)) and may be found at http://dx.doi.org/10.1121/1.3431693|
|Additional Information||POMA -159th Meeting Acoustical Society of America/NOISE-CON 2010 Conference location: Baltimore, Maryland 19 - 23 April 2010|
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