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Optimal glottal configuration for ease of phonation
1Departmento de Matemática, Universidade de Brasília DF, Brazil.
Summary
Optimal vocal fold configuration minimizes phonation threshold pressure. This study reveals that near-rectangular glottis geometry, balancing viscosity and flow separation, facilitates easier voice production.
Area of Science:
- Acoustics
- Biomechanics
- Fluid Dynamics
Background:
- Previous theories did not predict optimal glottal configurations for phonation.
- Experimental studies identified optimal glottal width and convergence angles for minimum phonation threshold pressure.
Purpose of the Study:
- Investigate the origin of the optimal glottal configuration for phonation.
- Examine the roles of glottal aerodynamics, including viscosity and flow separation.
Main Methods:
- Utilized a low-dimensional mathematical model of the vocal fold.
- Analyzed pressure losses due to air viscosity.
- Examined air flow separation from a divergent glottis.
Main Results:
- The optimal glottal configuration results from the combined effects of air viscosity and flow separation.
- Phonation threshold pressure is minimized in a near-rectangular glottis with slight vocal fold separation.
- Findings align with experimental data on optimal phonation.
Conclusions:
- The study elucidates the aerodynamic origins of optimal vocal fold geometry.
- A near-rectangular glottis configuration is crucial for efficient phonation.
- Mathematical modeling provides insights into voice production mechanisms.