The effects of windscreen flow on noise in motorcycle helmets

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

The effects of windscreen flow on noise in motorcycle helmets

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

Department of Psychology

Research output: Chapter in Book/Report/Conference proceeding › Conference Proceeding (Non-Journal item)

2 Citations (Scopus)

Abstract

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.

Original language	English
Title of host publication	Proceedings of Meetings on Acoustics
Number of pages	13
Volume	12
Publication status	Published - 2011
Event	POMA - 161st Meeting Acoustical Society of America - Seattle, United States of America Duration: 23 May 2011 → 27 May 2011

Conference

Conference	POMA - 161st Meeting Acoustical Society of America
Country/Territory	United States of America
City	Seattle
Period	23 May 2011 → 27 May 2011

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@inproceedings{cbc0eea25e7e44d4af1be7839e7160c0,

title = "The effects of windscreen flow on noise in motorcycle helmets",

abstract = "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.",

author = "John Kennedy and Michael Carley and Holt, {Nigel James} and Ian Walker",

year = "2011",

language = "English",

volume = "12",

booktitle = "Proceedings of Meetings on Acoustics",

note = "POMA - 161st Meeting Acoustical Society of America ; Conference date: 23-05-2011 Through 27-05-2011",

}

TY - GEN

T1 - The effects of windscreen flow on noise in motorcycle helmets

AU - Kennedy, John

AU - Carley, Michael

AU - Holt, Nigel James

AU - Walker, Ian

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/2160/11301

M3 - Conference Proceeding (Non-Journal item)

VL - 12

BT - Proceedings of Meetings on Acoustics

T2 - POMA - 161st Meeting Acoustical Society of America

Y2 - 23 May 2011 through 27 May 2011

ER -

The effects of windscreen flow on noise in motorcycle helmets

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