Experimental study on quasi-steady approximation of glottal flows
Résumé
To examine quasi-steady approximation of the glottal flow, widely used in the modeling of vocal fold oscillations, intraglottal pressures distributions were measured under unsteady flow conditions. Based on the standard M5 geometry (Scherer et al., 2001), the vocal fold model was constructed in an enlarged scale (7.5 times of the human hemilarynx). To realize unsteady flow conditions, the flow rate was sinusoidally modulated with a frequency of 2 Hz, which corresponds to 112.5 Hz in real life. Measurements of the intraglottal pressures under both steady and unsteady flows revealed that the pressure profiles of the unsteady flow conditions are non-distinguishable from those of the steady flow conditions as far as they have the same subglottal pressure as an input pressure. Our study therefore suggests that the unsteady glottal flow can be approximated as a series of steady flow states with a time-varying subglottal pressure in the range of normal vocalization frequencies.
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