7th International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2011)

Florence, Italy
August 25-27, 2011

Spectral Analysis of the Flow in a Glottal Model

Christoph Brücker, M. Triep, C. Kirmse, W. Mattheus, R. Schwarze

Institute of Mechanics and Fluid Dynamics (IMFD), TU Bergakademie Freiberg, Freiberg, Germany

The details in the formation of the primary acoustic sources in voice production during phonation are not yet fully understood. Some acoustic sources are due to the unsteady flow evolving between the vocal folds, where a jet develops. The glottal jet flow downstream the vocal folds features characteristics which depend on the physiological conditions, e.g. the parameters in geometry, kinematics, material and fluid. A driven mechanical model of the vocal folds is used with the aim to study the flow details and the acoustic sources in the glottal jet. Numerical simulations and experimental measurements of the flow are carried out. The results show topological characteristics of the glottal jet flow. When prominent ventricular folds are included in the vocal folds model the jet evolves differently due to the interaction with these supraglottal structures. They lead to a changed distribution and abundance of the flow acoustic sources and changed spectral properties of the flow close to the glottis.

Index Terms. mechanical vocal folds model, ventricular folds, flow simulation, higher harmonics, spectral analysis

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Brücker, Christoph / Triep, M. / Kirmse, C. / Mattheus, W. / Schwarze, R. (2011): "Spectral analysis of the flow in a glottal model", In MAVEBA-2011, 53-56.