National Repository of Grey Literature 5 records found  Search took 0.01 seconds. 
Numerical simulation of pronunciation of vowels based on FE models of human supraglottal acoustic spaces
Krampera, P. ; Horáček, Jaromír ; Dedouch, K. ; Vampola, T.
Aproximate finite element models of acoustic spaces corresponding to the human vocal tract for English vowels /a/ and /i/, created according to the geometrical data published in the literature, are used for the numerical simulations. The pronunciation of the vowels /a/ and /i/ is simulated using transient analysis for the FE models. The pulse excitation of the vocal tract is realised by the time dependent displacement of a small circular plate moving at the position of the vocal folds.
Numerical solution of interaction of mechanical and thermal processes at vibrations
Pešek, Luděk ; Půst, Ladislav
The contribution treats a method of solution and analysis of an interaction between thermal and mechanical processes in a vibrating non-conservative systems. Response curves of the 1DOF system containing a compliant element, made of material sensitive to temperature, are investigated. Increase of temperature is given by a loss of energy due to an internal damping in material and is influenced by a thermal convection into environs.
Acoustic modal analysis of male vocal tract for Czech vowels
Dedouch, K. ; Horáček, Jaromír ; Vampola, T. ; Švec, J. G. ; Kršek, P. ; Havlík, R.
Acoustic frequency-modal characteristics of six finite element models of a male vocal tract are presented and analysed. The FE models correspond to the vocal tract geometries for the Czech vowels /a/, /e/, /i/, /o/, /u/ and /y/ were obtained using the magnetic resonance imaging technique. The computed results of the acoustaic modal analysis are in a reasonable agreement with the data on formants known form the Czech phonetic literature.
Modelling of brain tissue influence on wave propagation i human skull after impact loading
Pešek, Luděk ; Horáček, Jaromír ; Trnka, Jan ; Veselý, Eduard
The contribution deals with the analysis of wawe propagation in human skull filled by a folling which simulates the brain tissue. The results are compared with the original experimental data, which where obtained by the laser- Doppler anemometry and the double pulse holointerferometry.
Numerical simulations of human vocal-fold vibrations in phonation onset caused by aeroelastic instability
Horáček, Jaromír ; Šidlof, P.
Implementation of nonlinear aerodynamic forces in the aeroelastic model of the vocal folds enabled to simulate the oscillations of the vocal fold just after loosing the stability of the system. Results in time domain are compared with the previous solution in frequency domain.

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