Document Detail


A theoretical model of the pressure field arising from asymmetric intraglottal flows applied to a two-mass model of the vocal folds.
MedLine Citation:
PMID:  21786907     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A theoretical flow solution is presented for predicting the pressure distribution along the vocal fold walls arising from asymmetric flow that forms during the closing phases of speech. The resultant wall jet was analyzed using boundary layer methods in a non-inertial reference frame attached to the moving wall. A solution for the near-wall velocity profiles on the flow wall was developed based on a Falkner-Skan similarity solution and it was demonstrated that the pressure distribution along the flow wall is imposed by the velocity in the inviscid core of the wall jet. The method was validated with experimental velocity data from 7.5 times life-size vocal fold models, acquired for varying flow rates and glottal divergence angles. The solution for the asymmetric pressures was incorporated into a widely used two-mass model of vocal fold oscillation with a coupled acoustical model of sound propagation. Asymmetric pressure loading was found to facilitate glottal closure, which yielded only slightly higher values of maximum flow declination rate and radiated sound, and a small decrease in the slope of the spectral tilt. While the impact on symmetrically tensioned vocal folds was small, results indicate the effect becomes more significant for asymmetrically tensioned vocal folds.
Authors:
Byron D Erath; Sean D Peterson; Matías Zañartu; George R Wodicka; Michael W Plesniak
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
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 Jul 
Date Detail:
Created Date:  2011-07-26     Completed Date:  2011-12-01     Revised Date:  2013-09-27    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  United States    
Other Details:
Languages:  eng     Pagination:  389-403     Citation Subset:  IM    
Copyright Information:
© 2011 Acoustical Society of America
Affiliation:
Department of Mechanical and Aerospace Engineering, The George Washington University, Washington, DC 20052, USA. erath@gwu.edu
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MeSH Terms
Descriptor/Qualifier:
Computer Simulation
Humans
Models, Biological*
Motion
Numerical Analysis, Computer-Assisted
Oscillometry
Phonation*
Pressure
Rheology
Time Factors
Vocal Cords / anatomy & histology,  physiology*
Voice*
Comments/Corrections
Comment In:
J Acoust Soc Am. 2013 Jul;134(1):9-12   [PMID:  23862779 ]
J Acoust Soc Am. 2013 Aug;134(2):913-6   [PMID:  23927090 ]

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


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