Hydro-elastic finite element model of a vocal fold replica

Nicolas Hermant (1) , Xavier Pelorson (1) , Paul Luizard (1) , Franz Chouly (2) , Fabrice Silva (3, 4)

1 GIPSA-GAMA - GIPSA - Group aeroacoustics, modeling and application
2 LMB - Laboratoire de Mathématiques de Besançon (UMR 6623)
3 M&S - Matériaux et Structures
4 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]

Experimental vocal fold replicas are currently used in speech production studies in order to validate simplified models on controllable devices. In addition to in-situ mechanical characterization, it is important to be able to understand their behavior when changing assembly properties or using parameters control to tune the folds, by developing a model able to predict their static and dynamic motions. This also enables to describe more complex vibration behaviors which could be harder to observe experimentally. This paper first presents a hydro-elastic finite element model of a single vocal fold. Numerical results are discussed, along with a parametric analysis. Then this model is extended to take into account the effect of the water pressure on the inflation of the folds and on the resonance frequencies. A hyper-elastic calculation is first used to simulate the latex inflation. An updated Lagrangian approach processes it as a pre-stress term in a modal analysis calculation for the small amplitude vibrations of the hydro-elastic structure, which allows to model the water pressure influence on the mechanical resonances of the simulated replica.

Mots clés: Fluid-structure Interaction; Vibrations; Modal Analysis; Finite Elements; Vocal folds; Acoustics

Domaines: Acoustique [physics.class-ph]; Biomécanique [physics.med-ph]; Vibrations [physics.class-ph]

Nicolas Hermant, Xavier Pelorson, Paul Luizard, Franz Chouly, Fabrice Silva. Hydro-elastic finite element model of a vocal fold replica. ICSV 2015 - 22nd International Congress on Sound and Vibration, Jul 2015, Florence, Italy. ⟨hal-01181630⟩