Document Detail


Experimental investigation of the influence of a posterior gap on glottal flow and sound.
MedLine Citation:
PMID:  18681605     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The influence of a posterior gap on the airflow through the human glottis was investigated using a driven synthetic model. Instantaneous orifice discharge coefficient of a glottal shaped orifice was obtained from the time-varying orifice area and the velocity distribution of the pulsated jet measured on the axial plane using a single hot-wire probe. Instantaneous orifice discharge coefficient values were found to undergo a cyclic hysteresis loop when plotted versus Reynolds number and time, indicating a pressure head increase and a net energy transfer from the air flow to the orifice wall. The net energy transferred was estimated to be around 10% of the value presumably required to achieve self-sustained oscillation. The radiated sound pressure was measured to characterize the influence of the minimum flow through the posterior gap on the broadband component of the radiated sound. The presence of a posterior gap was found to significantly increase the broadband sound level produced over the frequency range in which human hearing is most sensitive.
Authors:
Jong Beom Park; Luc Mongeau
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  124     ISSN:  1520-8524     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-08-06     Completed Date:  2008-10-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1171-9     Citation Subset:  IM    
Affiliation:
Department of Mechanical Engineering, McGill University, 817 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada. jong.b.park@mail.mcgill.ca
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MeSH Terms
Descriptor/Qualifier:
Glottis / anatomy & histology*,  physiology*
Humans
Models, Anatomic*
Models, Biological*
Oscillometry
Phonation*
Pressure
Rheology
Speech Acoustics
Time Factors
Vocal Cords / anatomy & histology,  physiology
Voice Quality

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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