Summary
Objectives
The present study explores the use of a continuum-based computational model to investigate
the effect of left-right tension imbalance on vocal fold (VF) vibrations and glottal
aerodynamics, as well as its implication on phonation. The study allows us to gain
new insights into the underlying physical mechanism of irregularities induced by VF
tension imbalance associated with unilateral cricothyroid muscle paralysis.
Methods
A three-dimensional simulation of glottal flow and VF dynamics in a tubular laryngeal
model with tension imbalance was conducted by using a coupled flow-structure interaction
computational model. Tension imbalance was modeled by reducing by 20% the Young's
modulus of one of the VFs, while holding VF length constant. Effects of tension imbalance
on vibratory characteristic of the VFs and on the time-varying properties of glottal
airflow as well as the aerodynamic energy transfer are comprehensively analyzed.
Results and Conclusions
The analysis demonstrates that the continuum-based biomechanical model can provide
a good description of phonatory dynamics in tension imbalance conditions. It is found
that although 20% tension imbalance does not have noticeable effects on the fundamental
frequency, it does lead to a larger glottal flow leakage and asymmetric vibrations
of the two VFs. A detailed analysis of the energy transfer suggests that the majority
of the energy is consumed by the lateral motion of the VFs and the net energy transferred
to the softer fold is less than the one transferred to the normal fold.
Key Words
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Article info
Publication history
Published online: April 10, 2014
Accepted:
December 23,
2013
Footnotes
The project described was supported by Grant Number ROlDC007125 from the National Institute on Deafness and Other Communication Disorders (NIDCD).
Identification
Copyright
© 2014 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
