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Contribution to modelling of bladed model disk with dry-friction contacts in tie-bosses
Pešek, Luděk ; Šnábl, Pavel ; Šulc, Petr ; Půst, Ladislav ; Bula, Vítězslav
The experimental set-up for studying dynamical behavior of the bladed wheel with pre-stressed dry-friction contacts in tie-bosses was built. The numerical solution of the turbine bladed wheel with tiebosses based on 3D finite element method with surface to surface dry friction contact model is proposed. Comparison of experimental and preliminary numerical results of dynamical behavior and damping estimation of our bladed wheel design yielded a reasonable agreement. Limitation of the non-linear solution due to dry friction contacts is HPC computations and long computation times. The contribution will deal with the achieved results.\n
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Influence of variable stiffness in toothed gears on the internal dynamics of the planetary gearbox
Šulc, Petr ; Pešek, Luděk ; Maturkanič, Dušan
This contribution is continuation of the work of above mentioned authors to whom this paper is dedicated. Their latest work dealt with numerical modelling of dynamics of planetary gearboxes with four satellites on flexible pins. They programmed the gear-box model in SIMULINK and now the model is an object of numerical investigations. This contribution describes the numerical model of the planetary gearbox. The numerical simulations are aimed to study an influence of variable stiffness in toothed gears on the internal dynamics of the planetary gearbox.
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Colloquium Fluid Dynamics 2012 : Proceedings
Uruba, Václav ; Jonáš, Pavel
The purpose of the Colloquium is to bring together experts on theoretical and experimental fluid mechanics from the academic institutes, universities and other research and development establishments and to offer the opportunity to exchange and update information on the solved problems and to serve as a forum for discussion with leading scientists.
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Dynamics of secondary flow in rectangular channel
Uruba, Václav ; Hladík, Ondřej ; Jonáš, Pavel
Secondary flow in straight channel of rectangular cross-section is studied experimentally. Special attention is devoted to dynamics of secondary vortices in channel corner. The stereo time-resolved PIV method is used to acquire time series of the 3-component vector fields in plane perpendicular to the channel axis. The dynamics of the vortical structures is studied using Proper Orthogonal Decomposition method giving the energetic modes.
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Identification of vortex structures in dynamicstudio software
Procházka, Pavel P. ; Uruba, Václav
Identification of vortex structures from experimentally gained velocity field is topical problem for last decades. Optimal identification method should detect vortex and its generation, evolution, interaction and decay both in time and in space. Since there is no exact definition of vortex structure, this task for any identification method is very difficult and results are not very often representative.layers characteristics, the mathematical model Abu-Darag was utilized in order to enable the prediction of the main boundary layer integral parameters.
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