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	Measurement and computation of acoustic characteristics of a simplified vocal tract model for phonation of vowel /a/ Kryštůfek, J. ; Vampola, T. ; Horáček, Jaromír ; Veselý, Jan The paper is focused on experimental verification of 3D modeling of the acoustic characteristics of human vocal tract for phonation of vowel /a/ by the finite element method. The computational and experimental modal analyses were carried out on the mathematical and physical models of the vocal tract. The acoustic pressure computed by transient analysis in time domain is compared with measured resonant characteristics in frequency domain. Detailed record
	Vliv geometrického tvaru hlasového ústrojí člověka na výslovnost českých hlásek Vampola, T. ; Horáček, Jaromír 1D and 3D finite element models of supraglottal tract designed for Czech vowel /a/ are analyzed. Performed modal analysis is focused on formant frequencies. For tuning of the human vocal tract model according to measured acoustic pressure in front of the lips the multi objective optimization method is used. Detailed record
	Akustic analysis of male vocal tract for Czech vowels Dedouch, K. ; Švec, J. G. ; Horáček, Jaromír ; Kršek, P. ; Havlík, R. ; Vokřál, J. The paper describes finite element models of male vocal tract designed from magnetic resonance images taken during phonation of all Czech vowels. First three formants calculated by frequency-modal analysis of the FE models are in good agreement with the data known from the Czech Phonetics. Detailed record
	Model of vocal fold oscillation in viscous fluid flow Horáček, Jaromír A vibrating element on an elastic foundation in the wall of a channel conveying air approximates the vocal fold oscillations. The viscous incompressible 1-D fluid flow theory is used and a generally defined shape of the vocal fold is considered. The numerical solution yields the instability thresholds, which are close to the known physiological data for phonation thresholds. The viscosity is important for very small opening of the glottis where its effect on instability boundaries increases. Detailed record
	Finite element model of male vocal tract considering clefting and interaction between hard palate and acoustic spaces Dedouch, K. ; Horáček, Jaromír ; Vampola, T. Results of a voice numerical simulation using finite element model of acoustic spaces corresponding to the human vocal tract for English vowel /a/ are presented. The approximate FE model was designed according to the data published in literature and amended by the model the nasal tract joint with the vocal tract by compliant bone of hard palate. Detailed record
	Numerical simulation of self-oscillations of human vocal folds based on aeroelastic theory Horáček, Jaromír ; Šidlof, P. Linear two degrees of freedom aeroelastic system for modelling vibrations of human vocal folds was originally developed by which the physiological conditions for so-called phonation thresholds were modelled. The thresholds are given by aeroelastic instabilities of divergence or flutter type. Afterwards the model was generalised taking into account the non-linear aerodynamic terms, important for small glottal openings and large vibration amplitudes. Detailed record
	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. Detailed record
	Shape of the human vocal folds in a defined phonation position Horáček, Jaromír ; Švec, J. ; Klepáček, I. ; Vetešník, A. ; Veselý, Jan The paper presents experimental investigation of aerodynamic shape of the vocal folds measured in a defined phonation position with excised larynges. The vocal fold vibrations were excited by airflow and monitored acoustically, by means of laser vibrometry, pressure transducers and stroboscopy techniques. Method for casting laryngeal cavities for determining the vocal fold shape was developed. By the optical topography and the electron scanning microscope the shapes of the vocal folds were analysed. Detailed record
	Termomechanické procesy v poddajných tlumících členech Pešek, Luděk ; Půst, Ladislav ; Vaněk, František Effect of increase of heat in the rubber-like materials with high inner damping during repeated deformation is investigated. Rheological properties e.g. stiffness and damping of such materials depend considerably on temperature. Knowledge of complex modulus properties of polymeric damping materials are strongly needed for the design of systems suppressed to vibrations, for the control of vibrations and noise. Simplified mathematical model of two degrees of freedom is analysed from the point of view of lost energy, heat transfer between inner and outer part, cooling of the surface and changing stiffness and inner damping. This model is the first stage for studying of thermomechanic interaction in the 3D form of damping elements by FEM Detailed record
	Experimentální akustická modální analýza modelu mužského vokálního traktu Horáček, Jaromír ; Veselý, Jan ; Pešek, Luděk ; Růžička, P. Detailed record

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