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Winding diagnostics using surge test
Vojtěch, Pavel ; Šlezingr, Jan (referee) ; Drápela, Jiří (advisor)
Master‘s Thesis deal with analysis given to diagnostic method plus her applicability to failure detection electrical machine plus apparatus in different phases their live. A further realization physical model with subtransient generátor PSG204A 4kV, for teach – in disorder on single – layer air coil plus stator winding induction motor inclusive evaluation results test.
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Macroscopic traffic flow modelling
Pidrová, Kateřina ; Opluštil, Zdeněk (referee) ; Kisela, Tomáš (advisor)
This bachelor thesis is focused on macroscopic traffic flow modelling. First, we present a short introduction into the topic and basic model classification. Then we derive the continuity equation for macroscopic models and outline possible constitutive relations for a flux which determine the key features of the model. The main part of this work is focused on LWR model and its solution by the method of characteristic curves, with emphasize on shockwave creation. The thesis is concluded by an example and experiment comparing of the LWR model with real traffic on highway.
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Specifications of the Ansys Fluent Solution Solver for low pressures in EREM
Šimík, Marcel ; Bílek, Michal (referee) ; Maxa, Jiří (advisor)
This thesis is focused on electron microscopy which issue is discussed at the beginning of work. The main attention is dedicated to the Environmental electron microscope, especially the differentially pumped chamber, which the thesis deals with. There is a production of an experimental chamber for analysis of shock waves on going therefore main goal of this thesis was to analyze the flow pattern in this chamber. Using the Ansys Fluent program, simulations of the characteristic flow that arises from the pumping of the vacuum chambers namely the ultrasonic flow at low pressures on which the most suitable turbulent module was applied as well as the degree of discretization was performed. The final analysis of this flow pattern is primarily focused on the localization of the shock wave which experimental evidence is to be lodged by shadow optical method as a part of the new concept of the chamber. The basis for the simulation of the chamber was taken over by Dr. Danilatos, with which the results were compared.
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Stress-strain analysis of the thin wall structure subjected to impact load
Tatalák, Adam ; Peč, Michal (referee) ; Návrat, Tomáš (advisor)
This master thesis deals with stress-strain analysis of simplified model of the thin wall transformer case subjected to impact load of electrical blast. Electrical blast is replaced by chemical blast (detonation of high explosive). The problem is solved using computational modeling utilizing the Finite Element Method (FEM) and LS-DYNA solver. After the introduction where detonation and shock wave propagation is explained the analytical approach is presented. This approach serves to results verification. In the next chapter is conducted research of applicable methods from which ALE method is chosen. In preliminary study is performed the mesh size analysis that is focused on finding the size of element which is both computational effective and gives accurate results. Next the infulence of input conditions (shape, location and parametres of high explosive, location of detonation point, boundary conditions) on distribution and time progress of pressure is investigated. Then influence of the opening on upper side of the case on overall pressure redistribution and strain and stress of the case is analysed. The stress-strain analysis of the case´s door which are connected to case by various types of contact models is performed as well as stiffness analysis of these types of contact.
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Launching and Operating Issues of Supersonic Business Jet
Kincová, Daniela ; Veselý, Petr (referee) ; Šošovička, Róbert (advisor)
Tato práce se zabývá problematikou zavedení a provozu nadzvukových business jetů. V dnešní době se v civilní letecké přepravě, po ukončení provozu Concordu, žádná nadzvuková letadla nevyskytují. V dnešní době existuje mnoho projektů a organizací, které se zabývají znovuzavedením nadzvukových letounů do civilního letectví a soustředí se převážně na business jety. Hlavní otázkou je, zda je vůbec vhodné, či rozumné se k tomu typu dopravy znovu vracet. Existuje hodně problémů, které toto komplikují. Tyto letouny způsobují příliš velký hluk, mají obrovskou spotřebu paliva a musí řešit nadměrné emise, létají ve vysokých výškách ve kterých může docházet k problémům s přetlakováním kabiny, navigací, radioaktivním zářením apod. Navíc zákaz supersonických letů nad pevninou letové cesty omezuje a prodlužuje. Současně vznikající projekty navíc nedosahují tak velkého doletu jako klasické moderní bussjety, což způsobuje, že se nadzvukové business jety se na delších tratích stávají neefektivní. I přes tyto problémy, je víceméně jisté, že k zavedení nadzvukových business jetů dojde během následujících 10 - 15 let, i kdyby to měla být jen otázka jisté prestiže velmi bohatých lidí.
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Fast Transient Phenomena in High Voltage
Vala, Martin ; Dohnal, Petr (referee) ; Krbal, Michal (advisor)
This work deals with research and description of the fast transients in high voltage technics. First part deals with division of fast transients and description of an impulse wave properties. Second part is focused on atmospheric overvoltage description and on direct and indirect lightning surge protection methods. Next, there are described the main characteristics and division of the surge protection devices in the work. In the next part, there are introduced some sort of high voltage generators, used for meassurement of impulse wave in a transmission line. In the last part there is stated an analysis of practical measurement of impulse weaves and surge arresters by using a Marx generator.
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Analysis of the supersonic flow of gas in the differentially pumped chamber EREM
Matloch, Roman ; Vyroubal, Petr (referee) ; Maxa, Jiří (advisor)
This work describes briefly electron microscopy issue and physical model of fluid flow. Then presented diploma thesis will be describing analysis and evaluation of the impact of supersonic flow on the pressure and density in the path of the primary electron beam in the differential pumping chamber. For analysis, evaluation and examination of the issue will be used CAD and CAE (Computer Aided Engineering) programs. At the same time it will be developed a methodology of calculation applicable to supersonic flow in the low pressure system at ANSYS CFX.
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Comparison of the effects of manual techniques and radial shock wave in the area of the myofascial trigger point.
Bohatý, Pavel ; Malá, Jitka (advisor) ; Vomáčková, Helena (referee)
Author: Bc. Pavel Bohatý Title: Comparison of the effects of manual techniques and radial shock waves in the area of the myofascial trigger point. Objectives: The main focus of this thesis is to compare the effect of treatment using radial shock wave and selected manual techniques. Methods: In this diploma thesis, the Wagner FDIX Force digital pressure algometer was first used to evaluate the effectiveness of both experimental methods to examine the pressure pain threshold, then a Visual Analogue Scale for pain and a two-arm goniometer to examine range of motion to the lateroflexion of cervical spine to opposite side from the occurring MTrp. The outcome data was stored in Microsoft Excel 365. Basic descriptive statistic was used for data analysis using mean values, medians, standard deviations, etc. Due to the heterogeneity of input values in both groups, a regression model and nonparametric Mann-Whitney U-test was used. The significance level for statistical tests was set at α = 0.05. Results: A total of 31 probands were involved in the research, of which 16 underwent radial shock wave therapy and 15 using manual techniques. A statistically significant improvement was measured in the group undergoing radial shock wave therapy in the examination of the pressure pain threshold at the 1st session (by...
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Frozen shoulder sy - effective physiotherapeutic approaches: systematic review
Drhlík, Michal ; Pavlů, Dagmar (advisor) ; Žáková, Lenka (referee)
Title: Frozen shoulder syndrome - effective physiotherapeutic approaches: systematic review Objectives: The aim of this work was to determine from studies concerning the treatment of the primary form of frozen shoulder syndrome using physiotherapeutic methods and published in the last 10 years, which brings the best results in reducing pain, increasing range of motion and improving affected shoulder function. Methods: Randomized controlled studies (double and single-blind) dealing with the physiotherapeutic intervention of frozen shoulder treatment with a data range of publications from September 1, 2011 to August 31, 2021 were searched. 3 databases were selected for this purpose: Cochrane Library, PubMed and Web of Science. Articles could be written in English, Czech, German, Slovak or Spanish. Different names of the studied disease were chosen as key words: adhesive capsulitis, contracted shoulder, frozen shoulder and periarthritis. Only articles with most probands between the ages of 30 and 70 were included. Persons with associated shoulder joint diseases such as rheumatoid arthritis (excluding diabetes mellitus) were excluded. The analysis of selected articles was performed from clearly compiled tables for individual studies and from 3 summary tables of associated individual physiotherapeutic...
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ESWT in Achilles tendinopathy
Hojková, Lýdie ; Demeková, Júlia (advisor) ; Havlíčková, Michaela (referee)
Achilles tendinopathy is a painful condition formed by chronic overuse. Conservative treatement requires activity modification, heel lifts, arch supports, even immobilisation. There are often unsatisfactory results with it. The use of ESWT has recently been introduced in soft-tissue disorders including epicondylitis, plantar fasciitis, calcifitation of the shloulder and, as well, Achilles tendinopathy. The aim of the work was to introduce the effects of ESWT on soft tissues, types of generation and new posibilities in ESWT therapy in Achilles tendinopathy.
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