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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.
231

Laboratorní demonstrátor pro vibrační diagnostiku / Laboratory demonstrator for vibrodiagnostics

Blecha, Martin January 2019 (has links)
This thesis deals with a vibration diagnostics of objects, structures and machines. The theoretical part is divided into three chapters according to type of the measurement. The first part called Modal Analysis discusses the basis of vibration, methods of measurement, relevant technical equipment and principle of experimental modal analysis. The second and third chapters of the thesis are focused on the diagnosis of defects. Each chapter mentioned above describes diagnosed defects, used methods and procedure for the diagnosis. Another part of the thesis summarizes practical issues and results gained in the laboratory experiments. It begins with discovering parameters of the measured object using technical diagnostics – experimental modal analysis. In the next step the hardware concept design was created, including custom measuring application programmed in LabVIEW. One part of the design is the laboratory model which includes a structure for free mounting and a possibility of excitation by an electrodynamic exciter. The application is also modified to enable measurements with shaker excitation. Finally, applications cooperating with professional software ModalVIEW and BK Connect were developed in order to simplify the operation and increase the comfort.
232

Modifikace povrchu kovových materiálů s využitím elektronového svazku / Surface Treatment Technology of Metallic Materials and its Applications using Electron Beam

Matlák, Jiří January 2019 (has links)
Fast deflection is one of the great advantages of an electron beam, making it possible to process a relatively large area at once and also to modify the distribution of the supplied energy. The dissertation deals with surface heat treatment with a focus on the effect of beam deflection on the process. Furthermore, the influence of processing speed and defocusing of the electron beam is studied. The principles of electron beam technology and the summary of surface heat treatment of various materials are presented in the literary part of the thesis. The experimental part is focused on the influence of process parameters on processing in the solid phase, carried out on steel 42CrMo4, and in in the liquid phase, carried out on alloy NiCrBSi. Especially changes in structure, hardness, shape of the processed area and wear resistance are evaluated on processed samples. The results are also evaluated from an energy perspective. Furthermore, an optimum combination of technological parameters is recommended for solid and liquid phase surface heat treatment.
233

Návrh nosné železobetonové konstrukce rodinného domu / Reinforced concrete structures of a family house

Bátrlová, Petra January 2019 (has links)
This diploma thesis concerns with a design of structure of a family house, garage and supporting wall. Design of these structures was accomplished id software SCIA Engineer, which uses finite element method and was veryfied by manual calculation. Design was ma-de in accordance with applicable standarts. The results are drawings of reinforcement of family house.
234

Návrh betonové konstrukce s ohledem na požární odolnost / Design of reinforced concrete structure with respect to fire resistance requirements

Lehoťák, Roman January 2021 (has links)
The diploma thesis deals with the analysis of internal forces and the design of the reinforcement of a reinforced concrete monolithic slab, a reinforcing wall and a column in the 1st floor of a dairy hall building. The fire resistance of selected structures was taken into account during dimensioning. The calculation of the internal forces was performed by the finite element method in Dlubal RFEM 5.24.
235

Analýza intrakardiálního elektrogramu v závislosti na transmuralitě ablační léze při katétrové radiofrekvenční ablaci srdečních arytmií / Analysis of intracardiac electrogram, depending on transmurality of ablation lesions at catheter radiofrequency ablation of cardiac arrythmias

Žbánková, Alena January 2013 (has links)
Catheter ablation is a unique method for cardiac arrhythmias treatment based on creating spot lesions of radiofrequency energy using intracardiac ablation catheter. Transmurality of these lesions should be achieved for long-term therapeutic treatment effect. The degree of myocardial damage depth is reflected in the parameters of sensed intracardiac ECG. From research studies is evident that the change in morphology and deflection of ablation signal play a key role in the assessment of transmurality. This thesis consists of theoretical introduction to electrophysiology, proposal and realization of methods for objective assessment of transmurality by processing signals in time, frequency and time – frequency domain. The end of this diploma thesis includes the statistical analysis of these clinical dat and comparison of methods.
236

Výpočet stropní konstrukce metodou konečných prvků pomocí programu ANSYS / Calculation of Ceiling Stucture by ANSYS FEM Program.

Juráň, Martin January 2012 (has links)
Create finite elements model ( FEM ) for solution direct stress of bend by ANSYS. Analyze calculated stress and deflextion, compare with results by simple manually-operated calculation. Extremes of these quantities compare with results by encoded rule.
237

Měření svislých posunů kostela v Zábrdovicích / Vertical Displacement Measurements at Brno Zábrdovice Church

Bocková, Lenka January 2014 (has links)
The diploma thesis deals with measuring height new stage of the church network in Brno Zabrdovice. Measuring by using method of precise leveling be going on with previous stage began in 2002, in order to detect vertical displacement. Processing include calculation and adjust of the heights, compare with fundamental and previous stage, interpretation and graphical form of vertical displacement. The thesis includes measuring and processing angular deflection of church towers.
238

Deformačně-napěťová analýza arteriálních aneuryzmat / Stress-strain analysis of arterial aneurysms

Tesařová, Petra January 2010 (has links)
The diploma thesis is focused on the creation of the aneurysm finite element model and the making of the aneurysm wall stess-strain analysis using ANSYS software. The model of abdominal aortic aneurysm geometry starts from the CT scan of the particular patient. In the thesis there are compared two chosen constitutive models, each of them appears from different mechanical tests done on human arterial fibre samples. Furthermore, a limiting condition for aneurysm wall structure damage is expressed. On the basis of the results of stress calculation in the aneurysm wall and the limiting condition, the safety coefficient and rupture factors risk are worked out.
239

Aktivní kompenzace průhybu nástroje / Active Compensation of Tool Deflection

Zarboch, Jaromír January 2013 (has links)
This paper deals with design of tool deflection compensation system for milling spindle C1, provided by company TOSHULIN, a.s. A simplified simulation model of the spindle supplemented by compensatory elements was built by using programs ANSYS, MD ADAMS, Matlab/Simulink. As action elements there were use three piezoactuators each controled by PID controler. Efficiency of this compensation system was verified based on performed simulations.
240

Výpočet průhybu hřídele elektrického stroje zahrnující vliv magnetického tahu / Programme for calculation of electric machine shaft deflection caused by magnetic traction

Kukačka, Radek January 2014 (has links)
This Master thesis desires the design of methodology for calculating shaft deflection and critical speed of electric machines. There are two methods used. The first one is transfer matrix method, which is represented by a simple programme for shaft creation and calculating needed results built in the Matlab software. The second one is finite element method, which is presented in the Ansys Workbench software.

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