title: Nonlinear vocal fold dynamics resulting from asymmetric fluid loading on a two-mass model of speech.
abstract: Nonlinear vocal fold dynamics arising from asymmetric flow formations within the glottis are investigated using a two-mass model of speech with asymmetric vocal fold tensioning, representative of unilateral vocal fold paralysis. A refined theoretical boundary-layer flow solver is implemented to compute the intraglottal pressures, providing a more realistic description of the flow than the standard one-dimensional, inviscid Bernoulli flow solution. Vocal fold dynamics are investigated for subglottal pressures of 0.6 < p(s) < 1.5 kPa and tension asymmetries of 0.5 < Q < 0.8. As tension asymmetries become pronounced the asymmetric flow incites nonlinear behavior in the vocal fold dynamics at subglottal pressures that are associated with normal speech, behavior that is not captured with standard Bernoulli flow solvers. Regions of bifurcation, coexistence of solutions, and chaos are identified.
authors.affiliation: Department of Mechanical and Aerospace Engineering, The George Washington University, Washington DC 20052, USA. erath@gwu.edu
authors.forename: Byron D
authors.initials: BD
authors.lastname: Erath
authors.forename: Matías
authors.initials: M
authors.lastname: Zañartu
authors.forename: Sean D
authors.initials: SD
authors.lastname: Peterson
authors.forename: Michael W
authors.initials: MW
authors.lastname: Plesniak
mesh_terms: D005931:Glottis / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D017711:Nonlinear Dynamics; D009716:Numerical Analysis, Computer-Assisted; D012212:Rheology; D013060:Speech / Q000502:physiology*; D013997:Time Factors; D014827:Vocal Cords / Q000502:physiology*