Human phonation does not always involve symmetric motions of the two vocal folds. Asymmetric motions can create slanted or oblique glottal angles. This study reports intraglottal pressure profiles for a Plexiglas model of the larynx with a glottis having a 10-degree divergence angle and either a symmetric orientation or an oblique angle of 15 degrees. For the oblique glottis, one side was divergent and the other convergent. The vocal fold surfaces had 14 pressure taps. The minimal glottal diameter was held constant at 0.04 cm. Results indicated that for either the symmetric or oblique case, the pressure profiles were different on the two sides of the glottis except for the symmetric geometry for a transglottal pressure of 3 cm For the symmetric case, flow separation created lower pressures on the side where the flow stayed attached to the wall, and the largest pressure differences between the two sides of the channel were 5%–6% of the transglottal pressure. For the oblique case, pressures were lower on the divergent glottal side near the glottal entry and exit, and the cross-channel pressures at the glottis entrance differed by 27% of the transglottal pressure. The empirical pressure distributions were supported by computational results. The observed aerodynamic asymmetries could be a factor contributing to normal jitter values and differences in vocal fold phasing.
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April 2001
April 01 2001
Intraglottal pressure profiles for a symmetric and oblique glottis with a divergence angle of 10 degrees
Ronald C. Scherer;
Ronald C. Scherer
Department of Communication Disorders, Bowling Green State University, 200 Health Center, Bowling Green, Ohio 43402
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Daoud Shinwari;
Daoud Shinwari
Department of Communication Disorders, Bowling Green State University, 200 Health Center, Bowling Green, Ohio 43402
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Kenneth J. De Witt;
Kenneth J. De Witt
Department of Communication Disorders, Bowling Green State University, 200 Health Center, Bowling Green, Ohio 43402
Chemical Engineering, University of Toledo, 3060 Nitschke Hall, Toledo, Ohio 43606-3390
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Chao Zhang;
Chao Zhang
Mechanical, Industrial, and Manufacturing Engineering, University of Toledo, 4006D Nitschke Hall, Toledo, Ohio 43606-3390
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Bogdan R. Kucinschi;
Bogdan R. Kucinschi
Mechanical, Industrial, and Manufacturing Engineering, University of Toledo, 4006D Nitschke Hall, Toledo, Ohio 43606-3390
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Abdollah A. Afjeh
Abdollah A. Afjeh
Mechanical, Industrial, and Manufacturing Engineering, University of Toledo, 4006D Nitschke Hall, Toledo, Ohio 43606-3390
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J. Acoust. Soc. Am. 109, 1616–1630 (2001)
Article history
Received:
August 15 1999
Accepted:
October 23 2000
Citation
Ronald C. Scherer, Daoud Shinwari, Kenneth J. De Witt, Chao Zhang, Bogdan R. Kucinschi, Abdollah A. Afjeh; Intraglottal pressure profiles for a symmetric and oblique glottis with a divergence angle of 10 degrees. J. Acoust. Soc. Am. 1 April 2001; 109 (4): 1616–1630. https://doi.org/10.1121/1.1333420
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