Noise mechanisms in motorcycle helmet noise

Michael Carley*, Nigel Holt, Ian Walker

*Awdur cyfatebol y gwaith hwn

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


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.

Iaith wreiddiolSaesneg
TeitlNoise mechanisms in motorcycle helmet noise
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 23 Ebr 2010
Cyhoeddwyd yn allanolIe
Digwyddiad159th Meeting Acoustical Society of America/NOISE-CON 2010 - Baltimore, MD, Unol Daleithiau America
Hyd: 19 Ebr 201023 Ebr 2010

Cyfres gyhoeddiadau

EnwProceedings of Meetings on Acoustics
ISSN (Argraffiad)1939-800X


Cynhadledd159th Meeting Acoustical Society of America/NOISE-CON 2010
Gwlad/TiriogaethUnol Daleithiau America
DinasBaltimore, MD
Cyfnod19 Ebr 201023 Ebr 2010

Ôl bys

Gweld gwybodaeth am bynciau ymchwil 'Noise mechanisms in motorcycle helmet noise'. Gyda’i gilydd, maen nhw’n ffurfio ôl bys unigryw.

Dyfynnu hyn