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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
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.
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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
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