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Aerodynamically and acoustically driven modes of vibration in a physical model of the vocal folds
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10.1121/1.2354025
/content/asa/journal/jasa/120/5/10.1121/1.2354025
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/5/10.1121/1.2354025

Figures

Image of FIG. 1.
FIG. 1.

The three lowest-order eigenmodes of a two-dimensional vocal foldlike structure: (a) eigenmode 1, analogous to the -10 mode; (b) eigenmode 2, analogous to the -10 mode, describes in-phase motion along the vertical extent of the medial surface; (c) eigenmode 3, analogous to the -11 mode, describes out-of-phase motion along the vertical extent of the medial surface. Left and right folds are shown to give an indication of the glottal geometry produced by the corresponding mode. Upper and lower frames indicate extreme positions of eigenmodes, spaced apart in a vibratory cycle. Solid lines indicate equilibrium positions.

Image of FIG. 2.
FIG. 2.

(a) Schematic of the experimental setup, and (b) the hemimodel configuration.

Image of FIG. 3.
FIG. 3.

(a) A sketch of the physical model of the vocal fold, and a superior view of the model both (b) with, and (c) without restrainers.

Image of FIG. 4.
FIG. 4.

Sound pressure power spectra as a function of increasing and decreasing subglottal pressure in the hemimodel configuration for: (a) a tracheal tube of length , without restrainer; (b) a tracheal tube of length , with restrainer; (c) a tracheal tube of length , without restrainer; (d) a tracheal tube of length , with restrainer.

Image of FIG. 5.
FIG. 5.

Anterior view of medial surface trajectories for one coronal slice of the medial surface of the vocal fold, midway between anterior and posterior extremes, for cases with (left) and without (right) restrainers. Because the vibrational amplitudes from the case with restrainers were relatively small, they have been amplified by a factor of three. For a clearer illustration, only trajectories from every fifth grid point are shown along the inferior-superior length. The tracheal tube length was .

Image of FIG. 6.
FIG. 6.

(Color online) Spatiotemporal plot of the medial-lateral component of the medial surface displacements for one coronal slice of the physical model, for both aerodynamically driven (top) and acoustically driven (bottom) modes of phonation. The tracheal tube length was .

Image of FIG. 7.
FIG. 7.

The first two temporal empirical eigenfunctions for aerodynamically driven (top) and acoustically driven (bottom) modes of phonation. The tracheal tube length was . —— first temporal eigenfunction; second temporal eigenfunction.

Image of FIG. 8.
FIG. 8.

(Color online) Normalized medial-lateral components of the first two spatial eigenfunctions for aerodynamically driven (left) and acoustically driven (right) modes of phonation. The tracheal tube length was .

Image of FIG. 9.
FIG. 9.

(Color online) Medial-lateral and superior-inferior components of the first two spatial eigenfunctions for one coronal slice of the medial surface of the vocal fold, midway between anterior and posterior extremes, for both aerodynamically driven (left) and acoustically driven (right) modes of phonation. Maximum (dash-dotted) and minimum (dashed) projections of the eigenfunctions are superimposed on the mean surface projection (solid). The tracheal tube length was .

Tables

Generic image for table
TABLE I.

Percentage variances (weights) and frequencies of the first four EEFs.

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/content/asa/journal/jasa/120/5/10.1121/1.2354025
2006-11-01
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Aerodynamically and acoustically driven modes of vibration in a physical model of the vocal folds
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/5/10.1121/1.2354025
10.1121/1.2354025
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