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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Frequency modal analysis of liquid/gas interaction in cylindrical container covered by thin circular plate
 Horáček, Jaromír ; Gorman, D. G. ; Griffond-Boitier, F.
The aim is to determine frequency-modal characteristics of the coupled system and to show when the fluid-structural and/or liquid-gas couplings are important for the dynamic behavior of the structure or fluid. A general theoretical solution is derived and the analytical-numerical results are partially compared with results obtained by finite element method (FEM) using ANSYS program code.
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Dynamická analýza tenkostěnné kruhové desky ovlivněné interakcí s kapalně-plynným prostředím v elastické válcové kavitě
 Horáček, Jaromír ; Griffond-Boitier, F.
The study deals with the free vibration analysis of a cylindrical thick-walled cavity filled by a gas axially bounded at one end by a liquid interface and by a thin elastic disc at the other end. Numerical calculations performed are compared with theoretical solution and with the experimental results. The interaction between water and air in a rigid cavity was also studied. The influence of a compliance of the rigid cavity on the natural frequencies was taken into account for comparison with experimental data.
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Simulace lidského hlasu s využitím MKP modelu vokálního traktu
 Horáček, Jaromír ; Griffond-Boitier, F.
Finite element models of male vocal tract for Czech vowel /a/ are analyzed and used for numerical simulation of phonation. The models were designed from the MRI the subject during phonation. The acoustic signals for the vowel /a/ are simulated using the transient analysis. For excitation of the supraglottal spaces the intraglottal pressure or airflow rate generated by the aeroelastic model of vocal folds self-oscillations is used. The frequency and time response functions calculated near the lips and in front of the mouth are compared with acoustic measurements.
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Počítačová simulace lidského hlasu s využitím aeroelastického modelu hlasivek a MKP modelu vokálního traktu člověka
 Horáček, Jaromír ; Šidlof, Petr ; Švec, J. G. ; Griffond-Boitier, F.
The developed finite element (FE) model of real male vocal tract that corresponds to the Czech vowel /a/ is used for numerical simulation of phonation. The FE model was designed from the magnetic resonance images (MRI) of the subject during phonation. The acoustic signals for the vowel /a/ are simulated using the transient analysis of the FE model in time domain. For excitation of the acoustic supraglottal spaces the intraglottal pressure generated by the aeroelastic model of vocal folds self-oscillations is used. The frequency and time response functions are calculated in front of the mouth.
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