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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Matematické a fyzikální modelování prouděním vyvolaného kmitání lidských hlasivek
 Šidlof, Petr ; Doaré, O. ; Cadot, O. ; Chaigne, A. ; Horáček, Jaromír
the pressure and velocity fields in coronal plane along the vibrating vocal folds were studied using a finite element mathematical model. The shapes of the vocal folds were specified according to data measured on excised human larynges in phonation position. The mathematical model of the flow is based on 2D incompressible Navier-Stokes equations adapted to deal with the time-variable shape of the domain, caused by vocal fold vibration. The numerical simulations allow to observe closely various flow features related to phonation - flow separation in the glottis, Coanda effect or vortex shedding.
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PIV měření proudění kolem samobuzeně kmitajícího modelu hlasivek
 Šidlof, Petr ; Doaré, O. ; Cherfa, L. ; Lahcene, Ch. ; Chaigne, A. ; Horáček, Jaromír
A new mechanical model of vocal folds was developed in cooperation with Ecole Nationale Supérieure de Techniques Avancées, Paris. Under specific conditions, the model exhibits flow-induced vibrations, where the vocal folds collide in each cycle. The model was designed to allow dynamic, acoustic and PIV measurements synchronized with the vocal fold oscillations. The results provide interesting information about the vocal fold dynamics and about the nonstationary flow structures, developing downstream the glottis, which closes periodically.
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