| Aeroacoustic sources of motorcycle helmet noise. | |
| | |
MedLine Citation:
|
PMID: 21895059 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
|
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. |
| | |
Authors:
|
J Kennedy; O Adetifa; M Carley; N Holt; I Walker |
Related Documents
:
|
2204279 - Assessment of muscle blood flow by laser-doppler flowmetry during hemorrhage in shr. 12015359 - Sympathetic restraint of muscle blood flow at the onset of dynamic exercise. 6539509 - Effect of prostaglandin e1 on blood flow in normal and ischemic canine hindlimbs. 6444799 - Control of blood flow in a large surface wound. 2600019 - Blood flow distribution in rat muscles during preexercise anticipatory response. 18002129 - A haemodynamic model of the venous network of the lower limbs. 19039129 - A simple law for ice-shelf calving. 9553239 - Low-flow anesthesia in adult orthotopic liver transplantation: a preliminary clinical e... 9470149 - The effects of combined distension of the stomach and the descending colon on coronary ... |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: The Journal of the Acoustical Society of America Volume: 130 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2011 Sep |
Date Detail:
|
Created Date: 2011-09-07 Completed Date: - Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
|
Languages: eng Pagination: 1164 Citation Subset: IM |
Affiliation:
|
Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, United Kingdom. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: In situ calibration of atmospheric-infrasound sensors including the effects of wind-noise-reduction ...
Next Document: Observationally constrained modeling of sound in curved ocean internal waves: Examination of deep du...