Publication 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.
English title
Numerical Simulation of the Effect of Stiffness of Lamina Propria on the Self-sustained Oscillation of the Vocal Folds
Type
conference paper
Language
en
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 in English
Simulation of phonation, Fluid-structure-acoustic interaction, Finite element method, Biomechanics of voice
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
ISSN
1805-8248
Book
Engineering Mechanics 2016
Number
22
Edition number
22
Pages from–to
182–185
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",
number="22",
month="May",
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"
}