Publication detail

Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels

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

Original Title

Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels

English Title

Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels

Type

conference paper

Language

en

Original Abstract

Superficial lamina propria (SLP) is a water-like vocal fold (VF) layer located directly under overlying epithelium. Its material properties affect VF motion and thus resulting spectrum of produced sound. Influence of stiffness and damping of the SLP on sound spectrum of Czech vowels is examined using a two-dimensional (2D) finite element (FE) model of a human phonation system. The model consists of the VF (structure model) connected with an idealized trachea and vocal tract (VT) (fluid models). Five VTs for all Czech vowels [a:], [e:], [i:], [o:] and [u:] were used and their geometry were based on MRI data. Fluid flow in the trachea and VTwas modelled by unsteady viscous compressible Navier-Stokes equations. Such a formulation enabled numerical simulation ofa fluid-structure-acoustic interaction (FSAI). Self-sustained oscillations of the VF were described by a momentum equation including large deformations and a homogeneous linear elastic model of material was used. Fluid and structure solvers exchange displacements and boundary forces in each iteration. During closed phase VFs are in contact and fluid flow is separated. We can observe that both the damping and the stiffness ofthe SLP substantially influence the amplitude and frequency ofVFs vibration as

English abstract

Superficial lamina propria (SLP) is a water-like vocal fold (VF) layer located directly under overlying epithelium. Its material properties affect VF motion and thus resulting spectrum of produced sound. Influence of stiffness and damping of the SLP on sound spectrum of Czech vowels is examined using a two-dimensional (2D) finite element (FE) model of a human phonation system. The model consists of the VF (structure model) connected with an idealized trachea and vocal tract (VT) (fluid models). Five VTs for all Czech vowels [a:], [e:], [i:], [o:] and [u:] were used and their geometry were based on MRI data. Fluid flow in the trachea and VTwas modelled by unsteady viscous compressible Navier-Stokes equations. Such a formulation enabled numerical simulation ofa fluid-structure-acoustic interaction (FSAI). Self-sustained oscillations of the VF were described by a momentum equation including large deformations and a homogeneous linear elastic model of material was used. Fluid and structure solvers exchange displacements and boundary forces in each iteration. During closed phase VFs are in contact and fluid flow is separated. We can observe that both the damping and the stiffness ofthe SLP substantially influence the amplitude and frequency ofVFs vibration as

Keywords

Simulation of phonation; Fluid-structure-acoustic interaction; Czech vowels; Finite element method; Biomechanics of voice

Released

13.05.2019

Publisher

Institute of Thermomechanics of the Czech Academy of Sciences

Location

Praha

ISBN

978-80-87012-71-0

Book

Engineering Mechanics 2019

Edition

First edition

Pages from

141

Pages to

144

Pages count

4

BibTex


@inproceedings{BUT157154,
  author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
  title="Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels",
  annote="Superficial lamina propria (SLP) is a water-like vocal fold (VF) layer located directly under overlying epithelium. Its material properties affect VF motion and thus resulting spectrum of produced sound. Influence of stiffness and damping of the SLP on sound spectrum of Czech vowels is examined using a two-dimensional (2D) finite element (FE) model of a human phonation system. The model consists of the VF (structure model) connected with an idealized trachea and vocal tract (VT) (fluid models). Five VTs for all Czech vowels [a:], [e:], [i:], [o:] and [u:] were used and their geometry were based on MRI data. Fluid flow in the trachea and VTwas modelled by unsteady viscous compressible Navier-Stokes equations. Such a formulation enabled numerical simulation ofa fluid-structure-acoustic interaction (FSAI). Self-sustained oscillations of the VF were described by a momentum equation including large deformations and a homogeneous linear elastic model of material was used. Fluid and structure solvers exchange displacements and boundary forces in each iteration. During closed phase VFs are in contact and fluid flow is separated. We can observe that both the damping and the stiffness ofthe SLP substantially influence the amplitude and frequency ofVFs vibration as",
  address="Institute of Thermomechanics of the Czech Academy of Sciences",
  booktitle="Engineering Mechanics 2019",
  chapter="157154",
  edition="First edition",
  howpublished="print",
  institution="Institute of Thermomechanics of the Czech Academy of Sciences",
  year="2019",
  month="may",
  pages="141--144",
  publisher="Institute of Thermomechanics of the Czech Academy of Sciences",
  type="conference paper"
}