Presented diploma thesis was created in cooperation with Siemens s.r.o., and deals with the analysis of the bending of aluminium sheets which are later used as a conductors of high voltage electrical energy. These parts are completed into assemblies which serves as connectors of particular segments of an electrical network. The problem occurs as a result of incorrect bend, because it is impossible to join these sections properly. The customer would like to verify if the defined tolerances of semi-finished products are sufficient for proper bend and in case they are not, the tolerances should be modified. Due to the requirement for running numerical simulation in one of the open source software, the Salome-Meca program environment was used.

This study is focused on plasticity induced crack closure effect on fatigue crack propagation. It utilizes finite element method modeling to evaluate the effect of this phenomenon on crack propagation at a series of MT specimen configurations. The modeling has been done both 2D and 3D. Comparison of computed results with experiments explains effect of the phenomenon at performed experimental measurements. Above all, three-dimensional modeling provides assessment of plasticity induced crack closure through thickness of the object. Thereby it explains shapes of fatigue crack fronts and lays foundations for including plasticity induced crack closure phenomenon to fatigue crack growth predictions in three-dimensional space.

The aim of the diploma thesis is the structural design of a trailer designed for the transport of building machinery on roads. The structural design takes into account the legislative requirements for given category of the trailer. The thesis involves strength analysis of a trailer frame using finite element method. Based on the results of the strength analysis, structural modifications of the frame are designed and the tenseness state is calculated again. An essential part of the work is the creation of selected drawing documentation.

The aim of this master thesis is to create a simple 3D electro-anatomical model of cardiac tissue that will be able to simulate the electrical activation in both a healthy heart and a heart with arrhytmogenic substrate. The model of electrical activation is realized in the COMSOL Multiphysics, simulation software for modelling using the finite element method. The Fitzhugh-Nagumo equation was used to model the excitatory feature of the myocardium and 2D models of myocardial tissue describing the propagation of action potential in healthy tissue, ischemic tissue, spontaneous action potential formation in the SA node, and spiral wave formation were first developed based on appropriate parameters. Subsequently, simplified 3D models of the heart describing the spread of excitement in a healthy heart, in the presence of accessory pathway and in third-degree atrioventricular block were created. The simplified 3D heart model offers a compromise between computational load and model complexity and can be used as a diagnostic tool for tissue and whole heart adjustment with appropriate equation parameter settings.

This thesis deals with the analysis of a three-phase winding of an induction engine. After the theoretical introduction concerning different types of windings, two types of their analysis and the importance of the winding factor, two methods of analysis and design tools are explained: Görges diagram and Tingley scheme. This scheme is then used for the design of all possible variants of winding for a certain number of stator slots and the theoretical shape of magnetic field is analysed. The next step is a deeper software analysis of the engines with variants of windings with different coil pitches and number of conductors per slot. Especially the finite element method is used in this part. The obtained values and their characteristics of the simulated engines are compared numerically and graphically. Then the changes of important values for different windings are described. The optimal winding according to chosen requirements is chosen.

The aim of the diploma thesis is the structural design of the field transfer trailer designed for harvesting work in agriculture. The first part of the thesis contains an overview of similar construction solutions and a summary of legislative requirements related to the device. In the next part is performed a description of the individual structural units, the design of the drive and the design of the screw conveyors. Based on the stated load conditions, the strength analysis of the large – volume hopper is processed, which is evaluated in the final part. An integral part of the thesis is also a partial drawing documentation. This diploma thesis was created in cooperation with the company ZDT Nové Veselí.

This diploma thesis deals with the measurement of the torsion stabilizer characteristics. The beginning of the thesis explains the function of a torsion stabilizer in a vehicle and introduces various technical options of stabilization. Next part is focused on computational simulation of representative stabilizers. Next parts are devoted to proposition of measuring device for torsion stabilizers in the laboratory and execution of the experiment. In the final part multibody model is created to demonstrate achieved results.

My thesis deals with the Multicast transfer in IP networks and it describes distribution technology of packets with special focus on Multicast technology. The thesis is devoted to the principles of Multicast including the description of scheme, protocol Multicast distribution, registration in the Multicast groups and finally the advantages and disadvantages of the Multicast transfer. Further in the thesis is described in details the Source Specific Multicast technology (SSM) that comes from multicast. There is a description how this technology Works and its implementation in the network equipment including the user side. This part of the thesis also deals with so called Distribution Trees that are used as multicast distribution via the IP networks like for example Internet. Based on the knowledge of the Multicast was created the network to spread the multimedia data with support of Multicast and SSM. The network is designed based on the Cisco system equipment as is: Cisco Content Engine 566, Cisco IP/TV broadcast server and router 1812. This multimedia network provides many services including the live TV broadcast and video channels. In this network using the multicast distribution of packets was done an analysis by protocol analyzer unit WIreshark and Finisar. This protocol analyzer unit allows us to compare the efficiency of multimedia data transfer between the Unicast, Multicast and SSM.

In this master’s thesis gives an overview of the finite element method (FEM) as used in electrotechnical practice. It deals with calculations of electric and magnetic fields. The task can be solved using ANSYS, FemLab, Femm, Quickfield and next software. Femm is the one I have chosen. The programs are described here, and their use is demostrated on examples. The outcome of the project is a calculation of magnetic field of a microgenerator in a stationary and dynamic field.

This project is focused on finite element method, for purposes of asynchronous motor modeling. Program FEMM is used here, which works with two-dimensional models. The model is based on an existing motor. Then was conducted a series of simulations that are used to calculate the parameters of the circuit model. Then was measured the existing asynchronous motor and performed the calculation of the circuit model parameters of the motor. Compared with data obtained from motor and models Then was compared their torque characteristics. Moments was identified at certain slip frequencies and voltage or current in circuit model.