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Seminar at Speech, Music and Hearing:

An aerodynamically driven multi-mass model of the vocal folds

Svante Granqvist

Abstract

A model of the vocal folds and the glottal air stream was implemented as a computer program. Like in the classical two-mass model, the oscillation of this model is driven by the glottal pressure induced by the subglottal pressure and aerodynamics of the glottal airflow. However, this model has a higher spatial resolution and uses a grid of typically 10 by 10 masses per fold and three resistances and non-linear springs per mass. The flows within the anterior-posterior sections of the glottis are modelled separately for each vertical row of masses. The pressures within the glottis are modelled separately for each mass. These glottal pressures are derived from the local flow and the resistive and inertive properties of the glottal air combined with the Bernoulli equation. The relatively large spatial resolution allows for examination of asymmetry and non-homogenous properties within the vocal folds. This property should make the model well suited to simulate pathological vocal folds. Preliminary tests of the model indicate an expected behaviour including a glottal wave and a leading upstream closure. This work was presented at PEVoC 6.

15:00 - 17:00
Tuesday November 22, 2005

The seminar is held in Fantum.

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Last updated: Wednesday, 23-Jun-2010 09:22:46 MEST