A computational study of the effect of vocal-fold asymmetry on phonation.
Unilateral laryngeal paralysis leads to tension imbalance and hence to asynchronous movements between the two vocal folds during phonation. In the current study, a computational model of phonation that couples a two-mass model of the vocal folds with a Navier-Stokes model of the glottal airflow, has been used to examine the dynamics of vocal fold configurations with tension imbalance and its implications for phonation. The simulations show that tension imbalance influences phonation onset, intensity as well as the fundamental phonation frequency. Distinct non-linear effects such as period-doubling bifurcation and preferential frequency selection are also observed.
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Department of Mechanical Engineering, Johns Hopkins University, 126 Latrobe Hall, 3400 North Charles Street, Baltimore, Maryland 21218, USA. mittal@jhu.edu
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Zheng
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Bielamowicz
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D000399:Air Pressure; D003198:Computer Simulation; D005583:Fourier Analysis; D005931:Glottis / Q000033:anatomy & histology / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D017711:Nonlinear Dynamics; D010699:Phonation; D013997:Time Factors; D014827:Vocal Cords / Q000033:anatomy & histology / Q000502:physiology*; D014831:Voice