Modeling the influence of acoustic loading on laryngeal self-sustained oscillations
Matías Zañartu, Luc Mongeau, George Robert Wodicka · The Journal of the Acoustical Society of America · 2006
Three-way interactions between sound waves in the subglottal and supraglottal tracts, the vibrations of the vocal folds, and laryngeal flow were investigated. Nonlinear coupling was investigated analytically, with a focus on the effects of a realistic acoustic loading on the self-sustained oscillation of the vocal folds. MRI-based shapes for the supraglottal tract [Story et al., J. Acoust. Soc. Am. 100, 537–554 (1996)] and an equivalent acoustical model for the subglottal tract [Harper et al., IEEE Trans. Biomed. Eng. 48, 543–550 (2001)] were considered. The model was based on the wave reflection analog technique, along with a novel single degree of freedom model of the vocal folds to describe the source. The effects of a mucosal wave on the vocal folds were incorporated through a time-varying discharge coefficient and a Bernoulli-type flow model. The relative importance of acoustic loading and time-varying flow resistance for fluid-structure energy transfer was compared for various configurations. [Work supported by NIH Grant RO1-DC05788.]