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Application of Electromagnetic and Acoustic Emission for the Diagnostics of Advanced Composite Materials
Trčka, Tomáš ; Chobola, Zdeněk (referee) ; Lokajíček,, Tomáš (referee) ; Koktavý, Pavel (advisor)
The subject of this dissertation is a theoretical and experimental study of electromagnetic and acoustic emission generated in the course of crack formation in solid dielectric materials. Theoretical part of this work is focused on the electromagnetic emission method, because it is related to a number of unsolved problems in the field of generated emission signals measurement, as well as in the field of the correct interpretation of obtained experimental data. Consequently, issues of emission signals detection by capacitance sensors and the transformation of crack primary parameters on the measured variables within the proposed transfer system have been dealt with. The results in this area were an extension of application range of the electromagnetic emission method on composite materials (especially on fiber reinforced polymer composites), identification and evaluation of the most significant emission sources in investigated composites and developing a methodology for evaluating of the crack primary parameters based on the measured emission signals waveforms in time and frequency domain. The experimental part of this dissertation was focused on a complex methodology for emission signals (including data from additional sensors) continual recording, processing and evaluation and for monitoring the response of stressed material to an applied mechanical load in real-time. Partial results from different research areas were also implemented into this methodology. This included the detection of emission signals, design and implementation of the appropriate measuring apparatus, analysis of measured signals in the time and frequency domain and advanced methods for processing and evaluation of measured data.
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Condition monitoring of small ball bearings
Šváb, Štěpán ; Pikula, Stanislav (referee) ; Havránek, Zdeněk (advisor)
The aim of this thesis was to build equipment for testing bearing condition analysis during its life. The theory of bearing parameter and diagnostics methodology for their analysis are discussed. Hardware used for device design and data collection. Finally, the course of measurement and software evaluating the end of the test are discussed.
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Survey, Diagnostics and Design of Reconstruction
Novotný, David ; Heřmánková, Věra (referee) ; Anton, Ondřej (advisor)
The subject of this thesis is the diagnostic investigation of block A in the object at Rumiště 8, Brno. The work includes theoretical knowledge of technical surveys and diagnostic methods and their evaluation to identify the essential characteristics of masonry and timber structures. In the practical part is the diagnostic investigation processed. Part of the diagnostic investigation is the determination of material characteristics of the structure. At the end of the thesis is an assessment of the structure.
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Survey and Diagnostics of Building Construction
Řezáč, David ; Heřmánková, Věra (referee) ; Anton, Ondřej (advisor)
The diploma thesis deals with the construction and technical survey of a reinforced concrete structure. The theoretical part describes the tested properties of concrete and the methodology of their tests used in the practical part. The practical part is devoted to the diagnosis of the existing structure, which was determined the strength of concrete using core holes, concrete adhesion by tear tests, and reinforcement of reinforced concrete elements of the structure determined by ground-penetrating radar, electromagnetic indicators and additional chopped probes.
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Survey and Diagnostics of Building Construction
Vítková, Barbora ; Heřmánková, Věra (referee) ; Anton, Ondřej (advisor)
The subject of this diploma thesis is the diagnostic survey of the masonry walls and the connecting bridge in the East Moat of Špilberk Castle. The thesis contains theoretical information about survey and diagnostics of building construction and then evaluation of diagnostic methods used for estimation of essential characteristics of masonry structures. In the practical part the diagnostic investigation of Špilberk Castle walls is processed. That includes determination of material characteristics of the studied structure. In the conclusion there is a suggestion of how to eliminate the structural defects found during the survey.
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Industrial TwinCAT based diagnostics application
Zigo, Ľubomír ; Ondroušek, Vít (referee) ; Krejsa, Jiří (advisor)
This bachelor´s thesis describes designing of diagnostics application for press controlled by Beckhoff TwinCAT. Application monitors press regularly and informs staff in case of breakdown. Diagnostics application is created in high-level programming language Visual C++ in Microsoft Visual Studio environment. Application communicates with TwinCAT via .NET Framework library TwinCAT::Ads, which is part of TwinCAT. Breakdown texts are read from database via Microsoft OLE DB interface using SQL.
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Diagnostics of rotating electric machines
Soukup, Patrik ; Mach, Martin (referee) ; Janda, Marcel (advisor)
The thesis Diagnostics of rotating electric machines deals with the theory of diagnostics of rotating machines, focusing especially on the diagnosis of asynchronous motors of high power. Due to the importance of maintaining the trouble-free condition of these machines with regard to serviceability, the importance of their diagnosis is growing. Due to inappropriate working conditions or for many other reasons, different types of malfunctions may occur in the machine. The list and the way of occurrence of possible failures are included and explained in this thesis. With the growing age of the machine, it is important to check the insulation status through insulation testing. These tests are performed in the practical part of the thesis and the results are presented. In the case of asynchronous machines, each anomaly leaves a signature in the form of an electrical, magnetic or vibrational signal. These signals are analyzed and evaluated using a specific measuring equipment with the intention of deciding on the current state of the machine. Motor current signature analysis (MCSA) is considered to be the main diagnostic method of asynchronous machines in this thesis. This method is described in detail in this paper and is being applied in electrical engineering.
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Diagnostics and Maintenance Design
Černoch, Adam ; Pohanka, Martin (referee) ; Kudrna, Jan (advisor)
In the text is given entry of visual inspection about implementation of the selected section in city of Luhačovice. Into forms were plotted failures of the road, determinated their lenght and surfaces. The following describes the evaluation and the cause of failure. After that is given the design and repair of the road. In the theoretical part is written the classification of failures according to TP 82 „Catalogue of flexible pavement failures“. From the cataloque I chose and mentioned important failures that are manifested in diagnosis section. Finally, describes the principles of planning and design of maintenance or repair.
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Hydrostatic, deformation and piston pressure gauges
Gregor, Kamil ; Turygin, Andrei (referee) ; Hammer, Miloš (advisor)
This bachelor thesis deals with barometers, especially the principle of their function. The topic of this thesis is hydrostatic barometers, which work on the principle of hydrostatic power; deformation barometers, which measure pressure on the basis of elastic deformation; and finally force barometers, which measure force derived from the pressure applied on a specific area inside the barometer. The first part of the thesis focuses on diagnostics using barometers. An example of practical application of diagnostics is presented, too. In the second part of the thesis there is a practical example of using barometers in diagnostics.
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