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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Issue of modeling of particulate composites
 Hutař, Pavel ; Náhlík, Luboš
The paper is focused on micro-mechanical modeling of particulate composites with polymer matrix. A composite with CaCO3 particles is modeled as three phase continuum in the work. The global effective mechanical properties of the composite are estimated on the base of knowledge of mechanical properties of individual constituents. Different size, distribution and material properties of the particles are taken into account. The paper can contribute to the better estimation of macro-mechanical properties of polymer matrix composites.
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Napěťová analýza lidských hlasivek
 Vampola, T. ; Horáček, Jaromír
A three-dimensional (3D) finite element (FE) fully parametric model of the human larynx was developed and used for numerical simulation of stresses during vibrating vocal folds the collisions. The complex model consists of the vocal folds, arytenoids, thyroid and cricoid cartilages. The vocal fold tissue is modelled as a three layered orthotropic material. The results of numerical simulation of the vocal folds oscillations excited by a prescribed intraglottal aerodynamic pressure are presented. The FE contact elements are used modelling the vocal folds collisions and the principal and shear stresses are computed in time domain on the surface and inside the vocal fold tissue. The results show significant dynamic stresses in all there directions and comparable maxima of Von Mises stresses were obtained for closed and open phases of the vocal folds motion.
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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.
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