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Magnetic drive
Aubrecht, Ondřej ; Pokorný, Michal (referee) ; Raida, Zbyněk (advisor)
In the bachelor thesis, selected types of magnetic motors are analyzed and mutually compared. For each motor, a short description is given and critical evaluation of its properties is provided. In the next part of the project, all the magnetic motors are mutually compared and a suitable type of the motor for the computer simulation is chosen. The simulations are performed in programs COMSOL Multiphysics and program Femm. In the last part of the project, simulations are checked on the real prototype of magnetic motor.
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Model of electric furnance for heat-resistant material processing
Franek, Lešek ; Malounek, Petr (referee) ; Dvořáček, Martin (advisor)
Content of the document is to create model of kiln, compare result with the real kiln. There is described 3D design in SolidWorks application, creation of a physical model in COMSOL Multiphysics and its export to Simulink. Subsequently is described the Simulink scheme, functions of program parts and visualization in B&R Automation Studio. The obtained results are compared with measured values. There is also described the design of a controller with a off-line identification.
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Modeling frequency selective surfaces in COMSOL Multiphysics
Höhn, Tomáš ; Oliva, Lukáš (referee) ; Raida, Zbyněk (advisor)
Metoda konečných prvků implementovaná v programu COMSOL Multiphysics je využívána k analýze tzv. free-standing kmitočtově selektivních povrchů ve 3D. Tyto modely jsou následně doplněny o periodické okrajové podmínky. Dále jsou free-standing povrchy doplněny o vrstvy dielektrika a je zkoumán jejich vliv na modul činitele odrazu. V analytické části jsou vyhodnoceny vlivy počtu elementů diskretizační mřížky na přesnost výsledku a délku výpočtů. Výsledky jsou srovnávány vzhledem k výsledkům uvedeným v literatuře [5]. V závěrečné části práce je vysvětlen postup při generování m-file pro obdélníkový element a použití globálního optimalizačního algoritmu PSO, který automaticky upravuje rozměry vodivého motivu tak, aby bylo dosaženo průběhu modulu činitele odrazu podle požadovaného průběhu.
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Modeling waveguides by time-domain finite elements
Fasora, Pavel ; Motl,, Milan (referee) ; Raida, Zbyněk (advisor)
The thesis deals with frequency domain finite elements and time domain finite elements. Derivation of the wave equation, generation of the discretization mesh and the composition of matrices for solving wave equation are presented. Exploitation of COMSOL Multiphysics for the analysis of the electromagnetic wave propagation in a wave guide is explained. Finally, in this thesis is described the m-file of MATLAB for analyzing electric field intensity of the waveguide in longitudinal direction to both domain. In last part is concisely exposed perfect match layers.
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Computing directivity patterns in Comsol Multiphysics
Ryšánek, Martin ; Lukeš, Zbyněk (referee) ; Raida, Zbyněk (advisor)
The individual project – Computing directivity patterns in Comsol Multiphysics. In the first part, the theoretical background for monopole antennas is reviewed. The second part is focused on the analysis of several types of monopoles in COMSOL Multiphysics, and on the calculation of their radiation patterns and impedances. Finally, simulation results are presented and discussed.
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Modeling non-conventional monopoles in COMSOL Multiphysics
Zmeškal, Vladimír ; Olivová, Jana (referee) ; Raida, Zbyněk (advisor)
The project deals with the computer simulation of non-conventional monopoles in the program COMSOL Multiphysics. First, the methodology for using COMSOL Multiphysics is described. Second, we concentrate on the design and modeling of three types of non-conventional monopoles: the conical one, the capacitively loaded one, and the drop-shaped one. For each monopole, directivity patterns are displayed. The influence of the variation of antenna dimensions to its parameters is discussed. Monopoles are mutually compared. Finally, models of monopoles are completed by global optimizations techniques: genetic algorithms and particle swarm optimization. That way, a design tool is developed in MATLAB.
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Model of tissue heating by KV diathermy
Bažantová, Lucie ; Čížek, Martin (referee) ; Rozman, Jiří (advisor)
This thesis deals with the basic theory of the electromagnetic field in the first part and the field interactions with biological tissues. Than describes shortwave diathermy as a technique used for purposes of medical treatment. The aim is to built a model of tissue heating in shortwave diathermy in COMSOL Multiphysics environment, so there is included a description of the programming environment, including the mathematical method that COMSOL uses for calculations. The output of the whole work is a model of the lower limb in the knee part and display the results after his diathermy heating.
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Mathematical modelling diffusion of metal ions in humic gel
Masár, Lukáš ; Ing. Eva Gregorová,CSc. (referee) ; Klučáková, Martina (advisor)
The subject of this bachelor thesis was simulation of diffusion processes proceeding in the reactive gelous media using the COMSOL Multiphysics software. The aim of this study was to develop a comprehensive set of models available for the interpretation of experimental data obtained in the study of metal ions transport in the humic acids hydrogel. The main consideration was given to the influence of porosity modelling and chemical interactions on the diffusion characteristics (mainly diffusion flow). Within the simulation of the influence of chemical reactions, different kinetic models were used (one-way reaction of first and second order and reverse reaction).
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Fractal capacitors properties
Chvíla, Ladislav ; Sedlák, Petr (referee) ; Hruška, Pavel (advisor)
This work is focused on computer simulations of fractal capacitors. The geometry of capacitors and its influence is investigated. Simulations are realized in programs Matlab, SolidWorks and Comsol Multiphysics. There are also several specific examples of different geometrics of capacitors their comparisons and assessment.
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