Národní úložiště šedé literatury Nalezeno 79 záznamů.  začátekpředchozí56 - 65dalšíkonec  přejít na záznam: Hledání trvalo 0.01 vteřin. 
Natural vibrations and stability of cylindrical shells in interaction with flowing fluid
Horáček, Jaromír ; Zolotarev, Igor
Natural frequencies and thresholds of stability of thin cylindricaal shell conveying or surrounded by flowing fluid are theoretically studied. Viscous fluid forces are modelled by the Darcy law, and effects of fluid compressibility are discussed. Particularly the effects of fluid viscosity and the type of boundary conditions at the edges of the shell on the critical flow velocities are demonstrated.
Použití identifikačních metod v resonanční ultrazvukové spektroskopii
Landa, Michal ; Kozánek, Jan ; Zolotarev, Igor ; Plešek, Jiří
V příspěvku je uveden přehled historie a jsou naznačeny možnosti aplikací resonanční ultrazvukové spektroskopie. Je popsán systém vyvíjený pro měření elastických konstant vzorků monokrystalů ze slitin s tvarovou paamětí. Experimentální uspořádání bylo testováno na přímé úloze měření vlastních frekvencí etalonových vzorků ze skla.
Interaction and feedbacks ´2001 /8./
Zolotarev, Igor
The proceedings including 39 texts from conference Interaction of dynamic systems with surroundings and systems with feedbacks.
Vibration cylindrical shells containing flowing fluid
Zolotarev, Igor
The natural frequencies of free vibration of a circular cylindrical shell containing flowing inviscid fluid are studied. The numerical results obtained by use simple 1-D shell theory are compared with results obtained by use 3-D shell theory and by us NSYS numerical package. Critical flow velocity is analyzed for several shape mode of studied cylindrical shell.
Vibration of a joint spherical shell - plate structure in interaction with an compressible filling
Zolotarev, Igor ; Velecká, S. ; Ihlárová, I. ; Wiszt, E.
The segment of spherical shell covered by an elastic plate and filled by a compliant substance represents a simplified mathematical model of a human skull including a model of brain tissue. The study of frequency-modal properties of this system was re
Vibration of cylidrical shell in interaction with flowing fluid /Z 1300/00/
Zolotarev, Igor ; Pelletier, D.
This report was prepared during a four months training period in the Institute of Thermomechanics of the Czech Academy of Sciences in the Department of Dynamics and Vibrations. The aim of this work is to create a program within the MATLAB software, which computes the natural frequencies of the vibration of a thin circular cylindrical shell in interaction with a flowing fluid.
On the solution of a natural vibration of cylindrical shells in interaction with flowing fluid
Zolotarev, Igor ; Pelletier, D.
The present paper is a contribution to the solution of a natural vibration of circular cylindrical shells in interaction with flowing inviscid fluid. The mathematical model of the studied system contains general boundary conditions of the shell for ends clamped elastically and allows to use the method of solution are based on the [1,2,4,5]. A new more accurately algorithm for calculation of the action of flowing fluid on the vibrating surface of the shell and frequency-modal properties of the studied system there are presented. Obtained results correspond to the earlier calculations of the natural frequencies and its variations on the flow velocities [4,5].
Numerical calculation of natural frequencies of an elastic sphere containing a compressible fluid
Zolotarev, Igor
The numerical calculation of natural frequencies of a spherical shell with an acoustical medium is studied in this paper as an approximation of the human skull. The elastic sphere is described by using thin shell theory and, in general, a compressible inviscid fluid, that is considered in the inside of the vibrating shell. The dynamic characteristics such as the natural frequencies and the modes of vibration are analysed as functions of the geometrical and physical parameters of the studied system. The problem of numerical calculations of the multiple natural frequencies of an elastic sphere and the coupling effect of the sphere and compressible fluid are discussed.

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