Source-filter interaction in an aeroelastic-aeroacoustic simulation of phonation

Simulations of phonation are presented which assess the degree to which the vocal tract resonator affects sound production by the flow-induced vibration of the vocal folds. The computations are performed with the fully-coupled aeroelastic-aeroacoustic approach using the immersed finite element method (IFEM) with controlled acoustic boundaries. For each case of larynx geometry and biomechanical properties, four simulations are run, one each for a vocal tract shape corresponding to the vowels (/a/, /i/ , /u/, and /ə/). To quantify how differences in vocal tract acoustic loading affect the source behavior, comparisons are made for the following quantities: vocal fold vibration patterns, glottal exit volume flow, glottal jet speed, vocal fold drag, work done by built-up pressure, and work done by acoustic resistance.