Research

Aeroacoustic sources of motorcycle helmet noise


Reference:

Kennedy, J., Adetifa, O., Carley, M., Holt, N. and Walker, I., 2011. Aeroacoustic sources of motorcycle helmet noise. Journal of the Acoustical Society of America, 130 (3), pp. 1164-1172.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1121/1.3621097

Abstract

The prevalence of noise in the riding of motorcycles has been a source of concern to both riders and researchers in recent times. Detailed flow field information will allow insight into the flow mechanisms responsible for the production of sound within motorcycle helmets. Flow field surveys of this nature are not found in the available literature which has tended to focus on sound pressure levels at ear as these are of interest for noise exposure legislation. A detailed flow survey of a commercial motorcycle helmet has been carried out in combination with surface pressure measurements and at ear acoustics. Three potential noise source regions are investigated, namely, the helmet wake, the surface boundary layer and the cavity under the helmet at the chin bar. Extensive information is provided on the structure of the helmet wake including its frequency content. While the wake and boundary layer flows showed negligible contributions to at-ear sound the cavity region around the chin bar was identified as a key noise source. The contribution of the cavity region was investigated as a function of flow speed and helmet angle both of which are shown to be key factors governing the sound produced by this region.

Details

Item Type Articles
CreatorsKennedy, J., Adetifa, O., Carley, M., Holt, N. and Walker, I.
DOI10.1121/1.3621097
DepartmentsFaculty of Humanities & Social Sciences > Psychology
Faculty of Engineering & Design > Mechanical Engineering
Research CentresAerospace Engineering Research Centre
RefereedYes
StatusPublished
ID Code26776

Export

Actions (login required)

View Item