The effects of windscreen flow on noise in motorcycle helmets

John Kennedy, Michael Carley, Nigel James Holt, Ian Walker

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

2 Dyfyniadau (Scopus)


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.
Iaith wreiddiolSaesneg
TeitlProceedings of Meetings on Acoustics
Nifer y tudalennau13
StatwsCyhoeddwyd - 2011
DigwyddiadPOMA - 161st Meeting Acoustical Society of America - Seattle, Unol Daleithiau America
Hyd: 23 Mai 201127 Mai 2011


CynhadleddPOMA - 161st Meeting Acoustical Society of America
Gwlad/TiriogaethUnol Daleithiau America
Cyfnod23 Mai 201127 Mai 2011

Ôl bys

Gweld gwybodaeth am bynciau ymchwil 'The effects of windscreen flow on noise in motorcycle helmets'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.

Dyfynnu hyn