Publication result detail

Numerical Simulation of the Effect of Stiffness of Lamina Propria on the Self-sustained Oscillation of the Vocal Folds

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

Original Title

Numerical Simulation of the Effect of Stiffness of Lamina Propria on the Self-sustained Oscillation of the Vocal Folds

English Title

Numerical Simulation of the Effect of Stiffness of Lamina Propria on the Self-sustained Oscillation of the Vocal Folds

Type

Paper in proceedings (conference paper)

Original Abstract

A two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during self- sustained oscillation of the human vocal folds (VF) is presented in this paper. The aim is to analyze the effect of stiffness of lamina propria on VF vibrations. Such stiffness change can be caused by some VF pathologies. The developed FE model consists of the FE models of the VF, trachea and a simplified human vocal tract. The vocal tract model shaped for simulation of phonation of Czech vowel [a:] was created by converting data from the magnetic resonance images (MRI). The developed FE model includes VF contact, large deformations of the VF tissue, fluid-structure interaction (FSI), moving boundary of the fluid mesh (Arbitrary Lagrangian-Eulerian (ALE) approach), airflow separation during the glottis closure and solution of unsteady viscous compressible airflow described by the Navier-Stokes equations. The numerical simulations showed that higher values of lamina propria Young's modulus (stiffer lamina propria) result in a decrease of the maximum glottis opening. Stiffer lamina propria also requires the use of higher subglottal pressure to initiate self-sustained vibration of the VF.

English abstract

A two-dimensional (2D) finite element (FE) model of the fluid-structure-acoustic interaction during self- sustained oscillation of the human vocal folds (VF) is presented in this paper. The aim is to analyze the effect of stiffness of lamina propria on VF vibrations. Such stiffness change can be caused by some VF pathologies. The developed FE model consists of the FE models of the VF, trachea and a simplified human vocal tract. The vocal tract model shaped for simulation of phonation of Czech vowel [a:] was created by converting data from the magnetic resonance images (MRI). The developed FE model includes VF contact, large deformations of the VF tissue, fluid-structure interaction (FSI), moving boundary of the fluid mesh (Arbitrary Lagrangian-Eulerian (ALE) approach), airflow separation during the glottis closure and solution of unsteady viscous compressible airflow described by the Navier-Stokes equations. The numerical simulations showed that higher values of lamina propria Young's modulus (stiffer lamina propria) result in a decrease of the maximum glottis opening. Stiffer lamina propria also requires the use of higher subglottal pressure to initiate self-sustained vibration of the VF.

Keywords

Simulation of phonation, Fluid-structure-acoustic interaction, Finite element method, Biomechanics of voice

Key words in English

Simulation of phonation, Fluid-structure-acoustic interaction, Finite element method, Biomechanics of voice

Authors

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

RIV year

2017

Released

12.05.2016

Publisher

Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague

Location

Svratka

ISBN

978-80-87012-59-8

Book

Engineering Mechanics 2016

ISBN

1805-8248

Periodical

Engineering Mechanics

Number

22

State

Czech Republic

Pages from

182

Pages to

185

Pages count

4

BibTex

@inproceedings{BUT126290,
  author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
  title="Numerical Simulation of the Effect of Stiffness of Lamina Propria on the Self-sustained Oscillation of the Vocal Folds",
  booktitle="Engineering Mechanics 2016",
  year="2016",
  journal="Engineering Mechanics",
  number="22",
  pages="182--185",
  publisher="Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v. v. i., Prague",
  address="Svratka",
  isbn="978-80-87012-59-8",
  issn="1805-8248"
}