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	Možnosti ladění a optimalizace akustických rezonančních vlastností vokálního traktu člověka Radolf, Vojtěch ; Vampola, T. The paper deals with optimization process finding such geometrical form of acoustical cavities of the human supraglottal spaces which leads to excitation of predefined acousic resonance, especially between a domain of the third and the fifth formant. The problem is solved by the transfer matrix method using conic acoustic elements for the vocal tract modelling and numerical method of searching a minimum of a goal function of several variables. The results should help to obtain a physical background for voice rehabilitation, for teaching of opera singers at musical facuoties and for better understanding of biomechanics of voice production. Detailed record
	Pohyb rotoru uloženého v aerodynamických ložiskách Půst, Ladislav ; Šimek, J. ; Kozánek, Jan The tilting pad bearings are very often applied in high speed rotating machines. The exact solution of bearing characteristics, including the motion of tilting pads, is very difficult and not yet completely elaborated. an approximate method for calculattion of rigid rotor motion with large amplitudes limited only by the bearing clearance is presented. The models of stiffness and damping forces valid for the entire area of journal motion in the aerodynamic bearingś clearance are based on the transformation of linear stiffness and damping characteristics calculated for two cases of stationary state and extended to the whole bearing field by using the correction function fc(r). Differential equations of motion of rigid rotor supported on two aerodynamic bearings with proposed nonlinear characteristics are numerically solved and resulting time histories of journal motion, their plane trajectories will be presented. Detailed record
	Výpočtové modelování vztahů mezi časovou změnou glotální plochy a úrovní vyzařovaného zvuku z vibrujících hlasivek Horáček, Jaromír ; Laukkanen, A. M. ; Šidlof, Petr The radiated sound pressure level (SPL) during phonation is known to be mainly regulated by lung pressure and glottal resistance (adduction), at the glottal level. Few results of glottal area variation in SPL control have been presented. The present study investigated the interrelations between sound pressure level at the glottis (SPL source) and lung pressure, maximum amplitude of vocal fold vibration and maximum glottal area declinatin rate for different fundamental frequencies and prephonatory glottal widths. These data were generated by an aeroelastic model used for numerical simmulations of vocal fold self-oscillations including the vocal folds collisions. The relations of SPL source to the parameters studied were in general non-linear. Detailed record

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