Physical mechanisms of phonation onset: a linear stability analysis of an aeroelastic continuum model of phonation |
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Authors: | Zhang Zhaoyan Neubauer Juergen Berry David A |
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Affiliation: | The Laryngeal Dynamics Laboratory, Division of Head and Neck Surgey, David Geffen School of Medicine at UCLA, 31-24 Rehabilitation Center, Los Angeles, California 90095-1794, USA. zyzhang@ucla.edu |
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Abstract: | In an investigation of phonation onset, a linear stability analysis was performed on a two-dimensional, aeroelastic, continuum model of phonation. The model consisted of a vocal fold-shaped constriction situated in a rigid pipe coupled to a potential flow which separated at the superior edge of the vocal fold. The vocal fold constriction was modeled as a plane-strain linear elastic layer. The dominant eigenvalues and eigenmodes of the fluid-structure-interaction system were investigated as a function of glottal airflow. To investigate specific aerodynamic mechanisms of phonation onset, individual components of the glottal airflow (e.g., flow-induced stiffness, inertia, and damping) were systematically added to the driving force. The investigations suggested that flow-induced stiffness was the primary mechanism of phonation onset, involving the synchronization of two structural eigenmodes. Only under conditions of negligible structural damping and a restricted set of vocal fold geometries did flow-induced damping become the primary mechanism of phonation onset. However, for moderate to high structural damping and a more generalized set of vocal fold geometries, flow-induced stiffness remained the primary mechanism of phonation onset. |
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