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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
221

Numerické modelování přepadu vody přes přeliv / Numerical Modelling of Weir Overflow

Šilhánková, Lenka January 2020 (has links)
This thesis deals with the numerical modeling of water overflow over the front spillway. The aim of the thesis is to calculate various types of turbulent models and to assess the overflow coefficient on a sharp front spillway. The model was created in free software SketchUp, but the modeling itself was carried out in FLOW-3D software. The content of the work is a description of used software, design and calculation.
222

Analýza chování koleje na účinky železničních vozidel / The analysis of track response to railway vehicles

Kopeček, Josef January 2020 (has links)
The diploma thesis deals with the assembly of numerical models of classical track using the finite element method in several variants. Models are compared with results obtained on analytical models. More complex models simulate the real behavior of a track running on a railway vehicle. The purpose is created methodology of modeling the railway track for use in static and dynamic analysis.
223

Návrh topologie kompozitního piezokeramického snímače / Proposal of topology of piezoceramic composite sensor

Dostal, Vojtěch January 2020 (has links)
This master thesis deals with design and numerical modelling of piezoceramic sensor, which is placed on a rail, in order to generate electrical energy, which can be used for wireless monitoring of railway traffic and to monitor the condition of the railway. The thesis is divided into three parts. Theoretically background of piezoelectric energy harvesting is described in first part, where some previous application of piezoelectric generator in railway area are shown. In the second part, parametric analysis of numerical model is performed, which directly leads to finding best location on a rail, where piezoelectric generator should be placed. For this analysis the homogenized model of MFC sensor was used. Results of the numerical model were then compared with the results of the conducted experiment. The third part presented own design of piezoceramic sensor, which is placed onto most suitable location on a rail. Results from numerical analysis shown eligibility of using piezoceramic sensor to monitor the railway traffic.
224

Teplovodná deska s řízeným teplotním polem / Thermal conductive plate with controlled thermal field

Masár, Pavol January 2010 (has links)
This work deals with design of thermal source of panel shape for scientific biological application. Panel has adjustable surface temperature and thermal gradient. The first part of this work concern with design and numerical modeling of the thermal system, application of materials and arrangement of thermal and cooling devices – Peltier elements. Second part of this work is about construction of the panel and experimental measurement.
225

Experimentální a numerická analýza ŽB prvku namáhaného kroucením / Experimental and numerical analysis of reinforced concrete member subjected to pure torsion

Řehák, Zdenek January 2013 (has links)
The design for load tests of reinforced concrete members subjected to pure torsion. Calculation of ultimate torsional strenght of the reinforced concrete members with different theoretical approaches. Creating a mathematical model in Atena 3D software. Evaluation and comparison of the experimental results with the analytical part of the project. Recommendations for implementation of a similar type of experimental tests.
226

Dynamická analýza ocelových nádrží s kapalinou / Dynamic analysis of steel tank with liquid

Farkasová, Zuzana January 2014 (has links)
Master´s thesis deals with dynamic analysis of steel tank with liquid. There are given parametres of structure and thein introduction to ANSYS system. There are created three numerical models for comparison, which are static and modal analysis calculated for. Spectrum analysis is calculated only for numerical models with fluid elements. Shell elements are evaluated according to EC 3.
227

CFD modelování hoření tuhých paliv na roštu / CFD modelling of grate combustion of solid fuels

Juřena, Tomáš January 2008 (has links)
Práce je zaměřena na vytvoření numerického modelu 1D experimentálního reaktoru pro spalování tuhých paliv. Metodou konečných objemů je provedena diskretizace řídících rovnic a takto formulovaná úloha je implementována do programu v prostředí MATLAB. V závěru jsou uvedeny výsledky několika simulací hoření slámy.
228

Studie vlivu polohy odváděcích otvorů na kvalitu vzduchu v obytné místnosti / Effect of an exhaust opening location on air quality in an apartment

Charvát, Tomáš January 2010 (has links)
This thesis deals with the influence of the location of exhaust outlets on the air quality. The study examines the performance of the hybrid ventilation system installed in an experimental house. The central point of this work is a numerical model of a bedroom with heat and carbon dioxide sources. The temperature, speed and concentration fields have been solved for, from which further quantities of thermal comfort PMV, PPD and DR were evaluated. Finally, the impact of changes in the quality of the microclimate using these quantities and in the energy efficiency ventilation is assessed.
229

Návrh a realizace klecové cívky pro MRI / Design and Realization of the Bird Cage Coil for MRI

Sedlář, Petr January 2016 (has links)
The work deals with the design and experimental production of the model type Birdcage coil used for magnetic resonance imaging system (MRI). The work deals with the design and behaviour of the model type Birdcage coil volume designed for imaging system for magnetic resonance imaging (MRI). Volume coils are generally very useful for use in MRI, because in transversal design allow easy access into the cavity when the flow vector of magnetization. The aim of the work was to construct a numerical model of transversal coil type Birdcage of the predefined dimensions. The created the coil tuned the desired resonant frequency having regard to maximize performance in the measured sample migrated. The modeling coil experimentally produced and measurements also confirm the accuracy of the numerical model.
230

Studie protipovodňových opatření v lokalitách Komín a Kníničky na Svratce / Feasibility study of the flood protection measures in the localities of Komín and Kníničky at the Svratka river

Šťastová, Barbora January 2017 (has links)
The aim of master‘s thesis is to assess the current state of the degree of flood protection on the basis of hydraulic calculations for different flood scenarios that correspond to the maximum culmination discharges Q1, Q5, Q20, Q100, Q100 unaffected in areas Komin and Kníničky on the Svratka at km 45.477 to 47.810. Hydraulic calculations were carried out using the coupled 1D and 2D numerical model. The outputs have been processed in the form of maps of depths and speed floodings.

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