The effects of windscreen flow on noise in motorcycle helmets
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Vortex shedding from a motorcycle windscreen results in three flow regions in which the rider's helmet may be immersed. First, the helmet may be completely in the free stream. Second, it may be in the path of vortex shedding from the windscreen. Third it may be underneath the shed vortices and shielded from the free stream by the windscreen. On-track noise tests were conducted and showed a difference in sound pressure level of more than 10dB and a change in spectra content, due to changes in riding position and helmet angle. Similar tests carried out in a wind tunnel, using simultaneous microphone and flow visualization measurements, allowed the identification of the flow regions. The potential contribution of vortex shedding to the noise was assessed using wavelet analysis to identify intermittent flow structures.
|Item Type||Conference or Workshop Items (Paper)|
|Creators||Kennedy, J., 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||PMA040005.pdf: Copyright 2011 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 Proceedings of Meetings on Acoustics 12:040005 and may be found at http://dx.doi.org/10.1121/1.3646304|
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