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WP3 - Phonation in replicas

The objective of WP3 is to investigate the transfer mechanisms of energy generated by mechanical oscillations of vocal folds and the modulated mass flow to the acoustic signal which radiates in the far field, from an experimental point of view (T3.1). Therefore WP3 performs experiments using a synthetic larynx model which contains synthetic multi-layer vocal folds showing flow-induced oscillations, followed by a vocal tract replica. This setup allows studying the complete process of fluid-structure-acoustic interaction as it occurs during human phonation. The vocal fold models will be designed to match similar oscillation patterns of human vocal folds. Besides the volume of the pharynx and the oral cavity a simplified nasal tract will be added (T3.1). Different measurement methods will be used as particle image velocimetry, hot wire anemometry, laser scanning vibrometry, high-speed flow visualization techniques and many others. All results of the transient pressure, velocity field and vocal fold dynamics deliver a comprehensive data base that will be used for the numerical simulations in WP2. Measurements on acoustic pressure will be also performed, and a special correlation technique will be used that yields information about the relevant acoustic source production downstream of the glottal area (T3.4). This will be very useful for the numerical simulations in WP5 and to test the unified numerical approaches in WP4.
Furthermore, a complementary approach of interlocked experimental and numerical measurement and analysis methods shows great promise for obtaining a deep physical understanding of the complex vowel or vowel-consonant phonation process (T3.5). The WP3 also delivers for the WP6 the vocal folds model for the investigations of the voiced plosives and fricatives sound generation.