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Intraglottal Glottal Pressure Distributions for Three Oblique Glottal Angles

Li, Jun
http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277146314

Abstract Details

2010, Master of Science (MS), Bowling Green State University, Physics.
Glottal obliquity occurs when the centerline of the glottis is not vertical, a consequence of oscillations of the vocal folds that are not mirror images of each other. This study examined the intraglottal surface pressure distributions for three cases of obliquity: 2.5, 5, and -3.75 degrees, relatively small oblique angles. These correspond to included glottal angles that are convergent, uniform, and divergent, respectively. The Plexiglas model M5 of the laryngeal airway with rectangular glottal ducts and insertable vocal fold pieces was used to obtain the pressure distributions. Glottal diameter and transglottal pressure were primary parameters for each obliquity case. The glottal diameters were 0.005, 0.01, 0.02, 0.04, 0.08, 0.16, and 0.32 cm. The pressure distributions ranged from 3-25 cm H2O for most cases. For each diameter, pressures were measured along both the flow wall (to which the flow jet adheres or was directed) and the non-flow wall (the side opposite the flow wall). Results indicate that the small angle obliquity cases studied here suggest significant pressure distribution differences compared to the symmetric glottis of the same included angle for the following conditions: for the convergent glottis for medium and large diameters; for the uniform glottis for small and for large diameters. However, there was little effect on pressure distributions for the divergent glottis, for small diameters for the convergent glottis, and for medium diameters for the uniform glottis. Relative to diameter change, strong effects were found. As the diameter was reduced, the pressure distributions rose both upstream and in the glottis for the uniform glottis, and increased in the glottis for the convergent glottis. For the divergent glottis, reducing the diameter moved the minimal pressure downstream to the minimal diameter location, and increased the pressures on the inferior vocal fold surfaces. In addition, when the airflow is shifted to change which wall is the flow wall, this shifts the minimal pressure and the shape of the pressure distributions. Pressure on the flow wall is typically lower than the pressure on the non-flow wall. In general, the effects of obliquity, diameter, and flow-wall alter the intraglottal surface pressure distributions to create different forces on the vocal folds. Further computer modeling needs to be performed to determine the specific oscillatory consequences (magnitude and symmetry of motion) of the effects found here.
Lewis Fulcher, PHD (Committee Chair)
Ronald Scherer, PHD (Committee Co-Chair)
Haowen Xi, PHD (Committee Member)
126 p.
Physics
glottal obliquity; vocal folds; intraglottal pressure distributions; convergent; uniform; divergent; Plexiglas model M5; glottal diameters; flow wall; non-flow wall; pressure distribution differences; symmetric glottis

Recommended Citations

Citations

  • Li, J. (2010). Intraglottal Glottal Pressure Distributions for Three Oblique Glottal Angles [Master's thesis, Bowling Green State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277146314

    APA Style (7th edition)

  • Li, Jun. Intraglottal Glottal Pressure Distributions for Three Oblique Glottal Angles. 2010. Bowling Green State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277146314.

    MLA Style (8th edition)

  • Li, Jun. "Intraglottal Glottal Pressure Distributions for Three Oblique Glottal Angles." Master's thesis, Bowling Green State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1277146314

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Bowling Green State University and OhioLINK.