Third International Workshop on Models and Analysis of Vocal Emissions for Biomedical Applications (MAVEBA 2003)

Florence, Italy
December 10-12, 2003

Velopharyngeal Insufficiency Studied Using Finite-Element Models of Male Vocal Tract with Experimental Verification

K. Dedouch (1), Jaromír Horáček (2), T. Vampola (1), J. Vokřál (3)

(1) Institute of Mechanics, Faculty of Mechanical Engineering, Czech Technical University Prague, Czech Republic
(2) Institute of Thermomechanics, Academy of Science of the Czech Republic, Prague, Czech Republic
(3) Phoniatric Laboratory, 1st Faculty of Medicine, Charles University Prague, Czech Republic

Finite element (FE) models of acoustic spaces corresponding to the human nasal and vocal tract for vowel /a/ are used for numerical simulations. Simplified FE model of the vocal tract for English vowel was created from geometrical data published in literature and for the Czech vowel by transferring data directly from MRI images. The nasal cavities were added to the models manually according to anatomical literature. The acoustic signal for the vowel /a/ is simulated using transient analysis of the FE models in time domain. The vocal tract is excited by time dependent displacement of a small circular plate moving at the position of the vocal folds. The time response and frequency response functions are calculated near the lips, nostrils and at the vocal folds. Effects of velofaryngeal insufficiency are simulated and compared to results from acoustic measurements.

Index Terms. Biomechanics of voice, acoustic transient and modal analysis, supraglottal spaces, cleft palate

Full Paper (reprinted with permission from Firenze University Press)

Bibliographic reference.  Dedouch, K. / Horáček, Jaromír / Vampola, T. / Vokřál, J. (2003): "Velopharyngeal insufficiency studied using finite-element models of male vocal tract with experimental verification", In MAVEBA-2003, 229-232.