Energy Flow Analysis of Vocal Fold Models

Complementary physical and computational models were developed and studied in order to investigate the aerodynamic energy transfer mechanisms that facilitate self-sustained vocal fold vibration. The physical model was fabricated using a flexible polyurethane compound. The model size, shape, and material properties were generally similar to corresponding human vocal fold characteristics. The numerical model was developed using geometry, boundary conditions, and material properties similar to those of the physical model. Analysis of the numerical results support the hypothesis that a cyclic variation of the orifice profile from a convergent to a divergent shape leads to a temporal asymmetry in the average wall pressure, which is the key factor for the achievement of self-sustained vocal fold oscillations. 1