Vocal tract changes caused by phonation into a tube: A case study using computer tomography and finite-element modeling

2011 ◽  
Vol 129 (1) ◽  
pp. 310-315 ◽  
Author(s):  
Tomáš Vampola ◽  
Anne-Maria Laukkanen ◽  
Jaromír Horáček ◽  
Jan G. Švec
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Computer Tomography ◽  
Vocal Tract ◽  
Element Modeling

scholarly journals Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Petr Hájek ◽  
Pavel Švancara ◽  
Jaromír Horáček ◽  
Jan G. Švec
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Vocal Fold ◽  
Vocal Tract ◽  
Stokes Equations ◽  
Magnetic Resonance Images ◽  
Coupling Scheme ◽  
Arbitrary Lagrangian Eulerian ◽  
Element Modeling ◽  
Glottal Flow

Finite-element modeling of self-sustained vocal fold oscillations during voice production has mostly considered the air as incompressible, due to numerical complexity. This study overcomes this limitation and studies the influence of air compressibility on phonatory pressures, flow and vocal fold vibratory characteristics. A two-dimensional finite-element model is used, which incorporates layered vocal fold structure, vocal fold collisions, large deformations of the vocal fold tissue, morphing the fluid mesh according to the vocal fold motion by the arbitrary Lagrangian-Eulerian approach and vocal tract model of Czech vowel [i:] based on data from magnetic resonance images. Unsteady viscous compressible or incompressible airflow is described by the Navier-Stokes equations. An explicit coupling scheme with separated solvers for structure and fluid domain was used for modeling the fluid-structure-acoustic interaction. Results of the simulations show clear differences in the glottal flow and vocal fold vibration waveforms between the incompressible and compressible fluid flow. These results provide the evidence on the existence of the coupling between the vocal tract acoustics and the glottal flow (Level 1 interactions), as well as between the vocal tract acoustics and the vocal fold vibrations (Level 2 interactions).

Applications and limitations of finite element modeling to glaciers: A case study

1985 ◽  
Vol 90 (B13) ◽  
pp. 11303 ◽  
Author(s):  
W. A. Nixon ◽  
J. A. Dowdeswell ◽  
A. P. R. Cooper ◽  
D. J. Drewry ◽  
L. G. Watts ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Element Modeling

A Parameterization Approach for Compliance Analysis and Synthesis of Flexure Mechanisms

2014 ◽  
Author(s):  
M. Jia ◽  
R. P. Jia ◽  
J. J. Yu
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Degree Of Freedom ◽  
Analytical Models ◽  
Type Synthesis ◽  
Geometric Properties ◽  
Element Modeling ◽  
Analysis And Synthesis ◽  
Serial Chains

This paper presents an approach based on parameterized compliance for type synthesis of flexure mechanisms with serial, parallel, or hybrid topologies. The parameterized compliance matrixes have been derived for commonly used flexure elements which are significantly influenced by flexure parameters including material and geometric properties. Different parameters of flexure elements generate different degree of freedom (DOF) characteristic of types. Enlightened by the compliance analysis of flexure elements, a parameterization approach with detailed processes and steps is introduced in this paper to help analyze and synthesize flexure mechanisms in the case study as serial chains, parallel chains, and combination hybrid chains. For a hybrid flexure, finite element modeling simulations results are compared to analytical compliance elements characters. Within linear deformations, the maximum compliance errors of analytical models are less than 6% compared with FE models. The final goal of this work is to provide a parameterized approach for type synthesis of flexure mechanisms that can be used to configure and change the parameters of flexure mechanisms to achieve desired DOF requirements of types initially.

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