Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation
The vocal folds in the larynx experience a self-excited oscillation with a wavelike motion during speech owing to interaction with respiratory airflow. The mechanism of the onset of the oscillation remains elusive partly because of compound effects of laryngeal muscles, although its better understan...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2006-10-01
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| Series: | Journal of Biomechanical Science and Engineering |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jbse/1/1/1_1_246/_pdf/-char/en |
| _version_ | 1818531993460146176 |
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| author | Shinji DEGUCHI Yusuke MIYAKE Yoshihiko TAMURA Seiichi WASHIO |
| author_facet | Shinji DEGUCHI Yusuke MIYAKE Yoshihiko TAMURA Seiichi WASHIO |
| author_sort | Shinji DEGUCHI |
| collection | DOAJ |
| description | The vocal folds in the larynx experience a self-excited oscillation with a wavelike motion during speech owing to interaction with respiratory airflow. The mechanism of the onset of the oscillation remains elusive partly because of compound effects of laryngeal muscles, although its better understanding has clinical significance in determining the ease with which phonation can be achieved. Approaches to the mechanism using a mechanical vocal fold model are useful because it allows investigating the roles of interested parameters in isolation. Here, we designed a mechanical vocal fold model made of a pair of rubber sheets. A key feature of the experimental setup is that it enables observations of high-speed deformation of the oscillating vocal fold model, together with pressure evaluations while changing separately isolated parameters associated with the laryngeal muscle functions. The observations of the oscillation onset demonstrated a gradually developed wavelike oscillation that spreads out over the rubber sheets. The magnitude of the motion is restricted by either increase in rubber restoring force or reduction in flow path width, each of the effects mimics the actual laryngeal muscle functions and reduces, in the experimental results, the threshold upstream pressure that induces the onset of the self-excitation. Thus, the present study highlights close association between degrees of oscillation, flow-tissue interaction, and threshold pressure required for the onset. |
| first_indexed | 2024-12-11T17:39:43Z |
| format | Article |
| id | doaj.art-c2198d13594246a5a9d60f4bc0690bef |
| institution | Directory Open Access Journal |
| issn | 1880-9863 |
| language | English |
| last_indexed | 2024-12-11T17:39:43Z |
| publishDate | 2006-10-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Biomechanical Science and Engineering |
| spelling | doaj.art-c2198d13594246a5a9d60f4bc0690bef2022-12-22T00:56:34ZengThe Japan Society of Mechanical EngineersJournal of Biomechanical Science and Engineering1880-98632006-10-011124625510.1299/jbse.1.246jbseWavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited OscillationShinji DEGUCHI0Yusuke MIYAKE1Yoshihiko TAMURA2Seiichi WASHIO3Graduate School of Natural Science and Technology, Okayama UniversityGraduate School of Natural Science and Technology, Okayama UniversityGraduate School of Natural Science and Technology, Okayama UniversityGraduate School of Natural Science and Technology, Okayama UniversityThe vocal folds in the larynx experience a self-excited oscillation with a wavelike motion during speech owing to interaction with respiratory airflow. The mechanism of the onset of the oscillation remains elusive partly because of compound effects of laryngeal muscles, although its better understanding has clinical significance in determining the ease with which phonation can be achieved. Approaches to the mechanism using a mechanical vocal fold model are useful because it allows investigating the roles of interested parameters in isolation. Here, we designed a mechanical vocal fold model made of a pair of rubber sheets. A key feature of the experimental setup is that it enables observations of high-speed deformation of the oscillating vocal fold model, together with pressure evaluations while changing separately isolated parameters associated with the laryngeal muscle functions. The observations of the oscillation onset demonstrated a gradually developed wavelike oscillation that spreads out over the rubber sheets. The magnitude of the motion is restricted by either increase in rubber restoring force or reduction in flow path width, each of the effects mimics the actual laryngeal muscle functions and reduces, in the experimental results, the threshold upstream pressure that induces the onset of the self-excitation. Thus, the present study highlights close association between degrees of oscillation, flow-tissue interaction, and threshold pressure required for the onset.https://www.jstage.jst.go.jp/article/jbse/1/1/1_1_246/_pdf/-char/enself-excited oscillationflow-structure interactionhigh-speed video camerapressure measurementvocal foldairwayphonation |
| spellingShingle | Shinji DEGUCHI Yusuke MIYAKE Yoshihiko TAMURA Seiichi WASHIO Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation Journal of Biomechanical Science and Engineering self-excited oscillation flow-structure interaction high-speed video camera pressure measurement vocal fold airway phonation |
| title | Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation |
| title_full | Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation |
| title_fullStr | Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation |
| title_full_unstemmed | Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation |
| title_short | Wavelike Motion of a Mechanical Vocal Fold Model at the Onset of Self-Excited Oscillation |
| title_sort | wavelike motion of a mechanical vocal fold model at the onset of self excited oscillation |
| topic | self-excited oscillation flow-structure interaction high-speed video camera pressure measurement vocal fold airway phonation |
| url | https://www.jstage.jst.go.jp/article/jbse/1/1/1_1_246/_pdf/-char/en |
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