The influence of the acoustic properties of motorcycle helmets on temporary hearing loss in motorcyclists

J. Kennedy, N. Holt, M. Carley, I. Walker

Research output: Contribution to journalArticle

1 Citation (Scopus)
63 Downloads (Pure)

Abstract

Noise is an unavoidable component of motorcycling. The noise sources are varied, and include the helmet itself which also filters the noise passing through it. Here helmet noise transmission characteristics have been analyzed using insertion loss measurements and loudness matching in a behavioural study. Results demonstrate the action of the helmet as a spectral filter and confirm previously published data showing attenuation in the frequency range above 500 Hz. Highlighted here for the first time is an amplification of noise below 500 Hz. The loudness matching task data allowed the generation of equiloudness functions which show the effect of the helmet on riders' perceptions of loudness. The generated curves are here compared to the relevant international standard (ISO226) and show that loudness was strongly influenced by the helmet. The noise experienced by a motorcycle rider on a 30 minute journey can result in a temporary hearing threshold shift of over 15 dB. Due to the filtering characteristics of the helmet this threshold shift is highly frequency dependent. To quantify the frequency dependence of the resulting temporary hearing threshold shift pure tone audiometry was conducted before and after exposure to white noise, with and without a helmet in a laboratory setting and after on-road noise exposure. Of particular note is the finding of increased hearing sensitivity at high frequencies following certain type of motorcycle noise exposure. The difference is discussed in the framework of the filtering characteristics of the helmet.
Original languageEnglish
Pages (from-to)1129-1138
Number of pages10
JournalActa Acustica United with Acustica
Volume100
Issue number6
DOIs
Publication statusPublished - 1 Nov 2014

Fingerprint

helmets
auditory defects
acoustic properties
loudness
hearing
thresholds
audiometry
filters
Hearing Impairment
Acoustics
Loudness
white noise
roads
insertion loss
Hearing
frequency ranges
attenuation
Filter
sensitivity
curves

Cite this

The influence of the acoustic properties of motorcycle helmets on temporary hearing loss in motorcyclists. / Kennedy, J.; Holt, N.; Carley, M.; Walker, I.

In: Acta Acustica United with Acustica, Vol. 100, No. 6, 01.11.2014, p. 1129-1138.

Research output: Contribution to journalArticle

@article{e334e5b53d3e4672b8d7a767d5b8dfa6,
title = "The influence of the acoustic properties of motorcycle helmets on temporary hearing loss in motorcyclists",
abstract = "Noise is an unavoidable component of motorcycling. The noise sources are varied, and include the helmet itself which also filters the noise passing through it. Here helmet noise transmission characteristics have been analyzed using insertion loss measurements and loudness matching in a behavioural study. Results demonstrate the action of the helmet as a spectral filter and confirm previously published data showing attenuation in the frequency range above 500 Hz. Highlighted here for the first time is an amplification of noise below 500 Hz. The loudness matching task data allowed the generation of equiloudness functions which show the effect of the helmet on riders' perceptions of loudness. The generated curves are here compared to the relevant international standard (ISO226) and show that loudness was strongly influenced by the helmet. The noise experienced by a motorcycle rider on a 30 minute journey can result in a temporary hearing threshold shift of over 15 dB. Due to the filtering characteristics of the helmet this threshold shift is highly frequency dependent. To quantify the frequency dependence of the resulting temporary hearing threshold shift pure tone audiometry was conducted before and after exposure to white noise, with and without a helmet in a laboratory setting and after on-road noise exposure. Of particular note is the finding of increased hearing sensitivity at high frequencies following certain type of motorcycle noise exposure. The difference is discussed in the framework of the filtering characteristics of the helmet.",
author = "J. Kennedy and N. Holt and M. Carley and I. Walker",
year = "2014",
month = "11",
day = "1",
doi = "10.3813/AAA.918792",
language = "English",
volume = "100",
pages = "1129--1138",
journal = "Acta Acustica United with Acustica",
issn = "1610-1928",
publisher = "S. Hirzel Verlag GmbH",
number = "6",

}

TY - JOUR

T1 - The influence of the acoustic properties of motorcycle helmets on temporary hearing loss in motorcyclists

AU - Kennedy, J.

AU - Holt, N.

AU - Carley, M.

AU - Walker, I.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - Noise is an unavoidable component of motorcycling. The noise sources are varied, and include the helmet itself which also filters the noise passing through it. Here helmet noise transmission characteristics have been analyzed using insertion loss measurements and loudness matching in a behavioural study. Results demonstrate the action of the helmet as a spectral filter and confirm previously published data showing attenuation in the frequency range above 500 Hz. Highlighted here for the first time is an amplification of noise below 500 Hz. The loudness matching task data allowed the generation of equiloudness functions which show the effect of the helmet on riders' perceptions of loudness. The generated curves are here compared to the relevant international standard (ISO226) and show that loudness was strongly influenced by the helmet. The noise experienced by a motorcycle rider on a 30 minute journey can result in a temporary hearing threshold shift of over 15 dB. Due to the filtering characteristics of the helmet this threshold shift is highly frequency dependent. To quantify the frequency dependence of the resulting temporary hearing threshold shift pure tone audiometry was conducted before and after exposure to white noise, with and without a helmet in a laboratory setting and after on-road noise exposure. Of particular note is the finding of increased hearing sensitivity at high frequencies following certain type of motorcycle noise exposure. The difference is discussed in the framework of the filtering characteristics of the helmet.

AB - Noise is an unavoidable component of motorcycling. The noise sources are varied, and include the helmet itself which also filters the noise passing through it. Here helmet noise transmission characteristics have been analyzed using insertion loss measurements and loudness matching in a behavioural study. Results demonstrate the action of the helmet as a spectral filter and confirm previously published data showing attenuation in the frequency range above 500 Hz. Highlighted here for the first time is an amplification of noise below 500 Hz. The loudness matching task data allowed the generation of equiloudness functions which show the effect of the helmet on riders' perceptions of loudness. The generated curves are here compared to the relevant international standard (ISO226) and show that loudness was strongly influenced by the helmet. The noise experienced by a motorcycle rider on a 30 minute journey can result in a temporary hearing threshold shift of over 15 dB. Due to the filtering characteristics of the helmet this threshold shift is highly frequency dependent. To quantify the frequency dependence of the resulting temporary hearing threshold shift pure tone audiometry was conducted before and after exposure to white noise, with and without a helmet in a laboratory setting and after on-road noise exposure. Of particular note is the finding of increased hearing sensitivity at high frequencies following certain type of motorcycle noise exposure. The difference is discussed in the framework of the filtering characteristics of the helmet.

UR - http://dx.doi.org/10.3813/AAA.918792

U2 - 10.3813/AAA.918792

DO - 10.3813/AAA.918792

M3 - Article

VL - 100

SP - 1129

EP - 1138

JO - Acta Acustica United with Acustica

JF - Acta Acustica United with Acustica

SN - 1610-1928

IS - 6

ER -