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August 2014
Stefan Kniesburges
Fluid-Structure-Acoustic Interaction during Phonation in a Synthetic Larynx Model
Fluid-Struktur-Akustik-Interaktion während der Phonation in einem künstlichen Kehlkopfmodell
The medical diagnostics of voice disorders are almost totally restricted to the analysis of the vocal fold vibrations and the generated acoustic signal. Hence synthetic models of the larynx have been developed to investigate the intraglottal and supraglottal flow field. Recently, elastic models of the vocal folds have been introduced that carry out self-sustained, flow-induced oscillations similar to human vocal folds.
The main focus of this work was to investigate the influence of different flow boundary conditions in the supraglottal region on the fluid-structure-acoustic interaction process of phonation. A synthetic experimental model of the human larynx model was developed, which involves synthetic single- and multi-layer models of the vocal folds that consist of silicone with different elastic properties. These vocal fold models execute self-sustained oscillations induced by an air flow that generated an acoustic signal. The variations of the boundary conditions involve an increase in the lateral diameter of the supraglottal channel, the inclusion of the ventricular folds and the removal of the supraglottal channel to obtain free field conditions. The experimental setup contains the subglottal channel representing the synthetic trachea, the mounting device for the synthetic vocal folds and the supraglottal channel in human length-scale. They are designed to produce aerodynamically driven vocal fold vibrations as is the case during normal speech.
Experimental studies of the structural motion of the vocal folds, of the dynamic supraglottal flow field and the generated sound were performed. Techniques such as high-speed imaging, flow visualization, phase-locked particle image velocimetry and static and acoustic pressure measurements were applied.
The main focus of this work was to investigate the influence of different flow boundary conditions in the supraglottal region on the fluid-structure-acoustic interaction process of phonation. A synthetic experimental model of the human larynx model was developed, which involves synthetic single- and multi-layer models of the vocal folds that consist of silicone with different elastic properties. These vocal fold models execute self-sustained oscillations induced by an air flow that generated an acoustic signal. The variations of the boundary conditions involve an increase in the lateral diameter of the supraglottal channel, the inclusion of the ventricular folds and the removal of the supraglottal channel to obtain free field conditions. The experimental setup contains the subglottal channel representing the synthetic trachea, the mounting device for the synthetic vocal folds and the supraglottal channel in human length-scale. They are designed to produce aerodynamically driven vocal fold vibrations as is the case during normal speech.
Experimental studies of the structural motion of the vocal folds, of the dynamic supraglottal flow field and the generated sound were performed. Techniques such as high-speed imaging, flow visualization, phase-locked particle image velocimetry and static and acoustic pressure measurements were applied.
Schlagwörter: fluid-structure-acoustic interaction; human phonation; synthetic vocal folds; flow-induced vibration
Schriftenreihe des Lehrstuhls für Prozessmaschinen und Anlagentechnik
Herausgegeben von Prof. Dr.-Ing. E. Schlücker, Erlangen-Nürnberg
Band 20
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