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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.
211

Modelování magnetohydrodynamických jevů / Modeling of magnetohydrodynamic phenomena

Mačák, Martin January 2018 (has links)
Theoretical part of this thesis is dedicated to the theoretical basis of electric conduction phenomena in fluids and method of calculation of magnetohydrodynamic phenomena. In the experimental part, computational modules have been developed to complement and augment the use of commercial simulation programs for simulation in the field of magnetohydrodynamics. On practical examples of mass spectrometer simulation, Einzel lens, electron movement and electric circuit breaker, the functionality of the computational models and the correctness of the obtained results were documented. Created computational modules can be used to design and optimize products using magnetohydrodynamic phenomena.
212

Analýza SMART zdrojů elektrické energie pro železniční dopravu

Zapletal, Vít January 2018 (has links)
This master thesis deal with analysis of possible alternative energy sources for health monitoring of railway trafic. Mainly focus on energy harvesting via SMART materials, specifically materials with piezoelectric and magnetostrictive properties. First theoretical background and real concepts are introduced, followed by material modelling and simulations. End of thesis cover parameter suggestion and SMART materials comparation and valorizations.
213

Analýza vlivu modelu materiálu na mechanické vlastnosti plastových kompozitních dílců / Analysis of the influence of the material model on the mechanical properties of plastic composite parts

Hudeček, Jan January 2018 (has links)
This master thesis deals with computing of mechanicals properties of parts of headlamps. Parts of headlamps are defined with two different material models, linear material model and material model from Moldflow method. The problem is solved by computational modeling with finite element method using Autodesk Moldflow Insight, Ansys 17.2 and Ansys 18.2 with included Moldsim tool. The outputs are calculations of mechanical properties and comparison of both material models.
214

Teplotní vlastnosti automobilových zdrojů světla - LED / Thermal properties of automotive light sources - LED

Bárta, Jiří January 2018 (has links)
The aim of this theses is to summarize the basic information about thermal properties of automobile lighting sources. The main topic is a LED diode. A model of a LED diode is going to be created in Inventor. A simulation of Joule's losses will be performed in Ansys Workbench Transient.
215

Sběr energie pomocí MEMS / MEMS based energy harvesting

Klempa, Jaroslav January 2019 (has links)
This work is dedicated to principles of energy harvesting or scavenging from free energy around us. Energy harvesting principles are described in the first part. Following chapter is devoted to description of piezoelectricity and piezoelectric materials. Next part researches already reported results on piezoelectric energy harvesters. Following chapter shows simulations on designed structures in ANSYS® Workbench. Next the fabrication of the structures is described. Measurement are made regarding to maximum generated power.
216

Výpočet rozložení teplotního pole v elektrickém stroji / Calculating the temperature field distribution in an electrical machine

Čermák, Jan January 2019 (has links)
The aim of this work was to create a 3D model of an asynchronous motor on which it is possible to perform temperature and other simulations using the Ansys Workbench computational software. The whole work consists of the theory of warming of electric machines, the separate construction of a 3D model and its temperature analysis.
217

Výpočet elektrodynamických sil působících na proudovodnou dráhu spínacího přístroje / Calculation of electrodynamic forces acting on current path of a switching device

Benčo, Tomáš January 2019 (has links)
The master thesis is focused on the calculation of electrodynamic forces acting on the contacts of the moulded case circuit breaker Siemens 3VA5 from OEZ Letohrad. This work is divided into ten chapters. In the introductory chapter it is described why it is important to deal with the calculation of the electrodynamic forces and the design of the current path. The second chapter describes the problem of the origin and effect of electrodynamic forces on individual parts of the electrical device. The third chapter describes the parameters, properties and design of the 3VA5 Siemens circuit breaker. The fourth chapter describes the Finite Element Methods. The fifth chapter describes how to create a 3D current path model in Solidworks. The sixth to ninth chapter is focused on the stationary calculation of moments in the program Ansys Maxwell by means of Magnetostatic Analysis and on the calculation of the total repulsive force between contacts with the influence of ferromagnetic materials. The last chapter is focused on dynamic calculation of moments and forces acting on contacts in a certain time interval.
218

Výpočtové modelování aerodynamického hluku způsobeného bočním zrcátkem automobilu / Computational modelling of aerodynamic noise caused by the car’s side mirror

Vobejda, Radek January 2019 (has links)
The master’sthesis deals with numerical modelling of aerodynamic noisewhich arisesinside of the carcabin. In the first part ofthe thesis simplified model of geometry of the car and of the inside acoustic pressure arecreated. After that numerical analysis of created models of geometry are doneandvarious models of turbulenceare discussed. The results of these CFD simulationswhere then used for changing the model of geometry of the wing mirror. Outputs of these simulations were used for solving the numerical analysis of noise in the car cabin.
219

Srovnání přenosu sil u duální hlavice a u náhrady trapéziometakarpálního kloubu s klasickou jamkou s fixovaným polyethylénem v jamce / Comparison of force transmission between trapezio-metacarpal prosthesis with dual mobility and standard prosthesis with fixed polyethylene in cup

Lamrich, Richard January 2019 (has links)
Presented master thesis focuses on comparison of total replacement with fixed polyethylene and replacement with dual mobility of trapeziometacarpal joint. Computational models consist of bones trapezium, trapezoid, first and second metacarpal and components of total replacements stem, neck, insert and cup. Replacements are compared on basis that how big force is transmitted from replacement to trapezium, contact pressures between neck and insert, equivalent elastic strains of bone tissue and lastly what is the influence of friction coefficient on results. Task was solved with finite element method in software ANSYS Workbench 19.2.
220

Optimalizace procesu tažení drátu / Optimization of the Wire Drawing Process

Kabilka, David January 2019 (has links)
The aim of work is to present and analyse assessment of the current state and at the same time the proposal of adjustments to the technology or parameters, the introduction of the wire into the drawing machine. The problem arises when the introduction of wire with a diameter of 14 mm from the material CK 67 to the drawbenches Schumag. If we introduce the wire into the drawing machines with two primary beams leads to a buckling of the wire and pack between the drawing die and the boot device. For the introduction of wire are used hydraulic boot collets, which are controlled semi-automatically. In connection with professional studies and on the basis of the calculation, simulation and practical experiment have been identified the conditions allowing the current method of deployment of wire to use.

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