Optimized transformation of the glottal motion into a mechanical model

Area of Science:

• Acoustics
• Fluid Dynamics
• Biomechanics

Background:

• Human vocal fold oscillation during phonation is a complex myoelastic-aerodynamic process.
• In vivo experiments are limited, necessitating accurate physical models for research.
• Existing models approximate vocal fold kinematics, limiting detailed fluid dynamic analysis.

Purpose of the Study:

• To develop and present an experimental model for visualizing vocal fold fluid dynamics.
• To extend an existing glottal cam model to more realistically replicate observed glottal closure types.
• To investigate the relationship between altered glottal kinematics and the resulting aero-acoustic field influencing voice quality.

Main Methods:

• An up-scaled glottal cam model was enhanced to reproduce realistic glottal closure kinematics.
• Cam geometries with varying profiles were generated for four typical glottal closure types.
• Two counter-rotating cams covered with silicone membranes simulated observed vocal fold movements.

Main Results:

• The enhanced model successfully replicated observed glottal movements and closure types.
• Visualization of fluid dynamics associated with different glottal kinematics was achieved.
• The study provides a foundation for understanding the aero-acoustic consequences of specific glottal motions.

Conclusions:

• The improved experimental model offers a valuable tool for studying vocal fold fluid dynamics.
• Replicating realistic glottal closure enhances the understanding of voice production mechanisms.
• This research contributes to elucidating the fluid dynamical basis of voice quality variations.