Publication detail

Two-dimensional finite element model of vowel production: properties of self-oscillating vocal folds interacting with fluid flow

HÁJEK, P. ŠVANCARA, P. HORÁČEK, J. ŠVEC, J.

Original Title

Two-dimensional finite element model of vowel production: properties of self-oscillating vocal folds interacting with fluid flow

English Title

Two-dimensional finite element model of vowel production: properties of self-oscillating vocal folds interacting with fluid flow

Type

abstract

Language

en

Original Abstract

The current study concerns finite element (FE) model of flow-induced self-sustained oscillation of the human vocal folds (VF) in interaction with vocal tract (VT) acoustics. Two dimensional (2D) FE model consists of the fluid model (involving the VT and trachea) and the structure model (the VF). Geometry of the VT was converted from magnetic resonance images (MRI) data for production of a Czech vowels. The VF model is based on widely used Scherer’s M5 geometry with four-layered structure comprising epithelium, superficial lamina propria (SLP), ligament and muscle. For solving fluid-structure interaction explicit coupling scheme is applied with separate solvers for the structure and fluid domain. Acoustic wave propagation is obtained from solution of compressible NS equations. Phonation of the Czech vowels [a:], [i:] and [u:] were simulated and influence of thickness and material characteristics of the SLP on vocal folds vibrations and produced sound were analysed. Using this model was also analyzed the effect of turbulence model in fluid flow calculation. The developed FE model can be used to study the effects of pathological changes in VF tissue such as Reinke’s edem on VF movement and on the produced sound.

English abstract

The current study concerns finite element (FE) model of flow-induced self-sustained oscillation of the human vocal folds (VF) in interaction with vocal tract (VT) acoustics. Two dimensional (2D) FE model consists of the fluid model (involving the VT and trachea) and the structure model (the VF). Geometry of the VT was converted from magnetic resonance images (MRI) data for production of a Czech vowels. The VF model is based on widely used Scherer’s M5 geometry with four-layered structure comprising epithelium, superficial lamina propria (SLP), ligament and muscle. For solving fluid-structure interaction explicit coupling scheme is applied with separate solvers for the structure and fluid domain. Acoustic wave propagation is obtained from solution of compressible NS equations. Phonation of the Czech vowels [a:], [i:] and [u:] were simulated and influence of thickness and material characteristics of the SLP on vocal folds vibrations and produced sound were analysed. Using this model was also analyzed the effect of turbulence model in fluid flow calculation. The developed FE model can be used to study the effects of pathological changes in VF tissue such as Reinke’s edem on VF movement and on the produced sound.

Keywords

Biomechanics of voice; Vocal folds; Fluid-structure-acoustic interaction; Finite element method;

Released

30.08.2017

Location

Ghent

URL

BibTex


@misc{BUT143390,
  author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
  title="Two-dimensional finite element model of vowel production: properties of self-oscillating vocal folds interacting with fluid flow",
  annote="The current study concerns finite element (FE) model of flow-induced self-sustained oscillation of the human vocal folds (VF) in interaction with vocal tract (VT) acoustics. Two dimensional (2D) FE model consists of the fluid model (involving the VT and trachea) and the structure model (the VF). Geometry of the VT was converted from magnetic resonance images (MRI) data for production of a Czech vowels. The VF model is based on widely used Scherer’s M5 geometry with four-layered structure comprising epithelium, superficial lamina propria (SLP), ligament and muscle. For solving fluid-structure interaction explicit coupling scheme is applied with separate solvers for the structure and fluid domain. Acoustic wave propagation is obtained from solution of compressible NS equations. Phonation of the Czech vowels [a:], [i:] and [u:] were simulated and influence of thickness and material characteristics of the SLP on vocal folds vibrations and produced sound were analysed. Using this model was also analyzed the effect of turbulence model in fluid flow calculation. The developed FE model can be used to study the effects of pathological changes in VF tissue such as Reinke’s edem on VF movement and on the produced sound.",
  chapter="143390",
  howpublished="print",
  year="2017",
  month="august",
  type="abstract"
}