Laryngeal source excitation modelling

Pereira, Jose Carlos (1987) Laryngeal source excitation modelling. University of Southampton, Doctoral Thesis.

Abstract

In this work, the two-mass model of the human vocal folds is expanded by including the false vocal folds and the laryngeal ventricle. Several glottis profiles are postulated to exist which are the result of the forces applied to the mucus membrane due to intra-glottal pressure variation. These profiles constrain the air flow which allows the formation of one or two `venae contractae'. The location of these influences the pressure in the glottis and laryngeal ventricle and also give rise to additional viscous losses as well as losses due to flow enlargement. Recent tomograms of the larynx during phonation have shown that the entry angle of the glottis to be more abrupt than that adopted for other models, the difference being around 60 percent. The entry angle of the glottis has a strong influence on the glottal waveform if flow separation is based on it. Results show that the computed waveforms agree with physiological data and that it is not necessary to use any empirical constants to match the simulation results. Supporting evidence for the physiologically realistic behaviour of the model is obtained by comparing the model's behaviour with in vivo observations of other researchers. (D82119)

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