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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
ON THE ROLE OF BOUNDARY LAYER SEPARATION IN FLUID-FLOW - STRUCTURE INTERACTION
 Uruba, Václav
Paper is dealing with dynamical aspects of force interaction between surface and flow. Effect of a boundary layer separation on this interaction is analyzed. As an example, the experimental results on circular cylinder in cross-flow are shown. Substantial dynamical behavior of a boundary layer separation is demonstrated. This dynamics involves not only the well known Kármán vortex street, but the structure is much more complicated. The system of separation bubbles was detected as a rule.
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Influence of non-ideal driving motor on stability of vibrating system
 Půst, Ladislav ; Radolfová, Alena
Vibrations of mechanical 1DOF system excited by electric driving motor with limited power and inertia were analysed. Equations describing stationary and transient motions are derived by means of averaging method. Unstable section of response curves was ascertained and computing method for analysis of motion inside this section derived.
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Generating of periodic oscillations in fluid flow
 Jonáš, Pavel
In the paper the device is described producing periodic oscillations of the main flow in the working section of the small high speed wind-tunnel IT AS CR. The upper limit of frequency ia 500 Hz and the non-steady Reynolds number can vary from deep below the critical value up to far above 25000.
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