Education

Martin Půta - Acoustic design of the listening room (2019)

Head Ing. Oldřich Tureček, Ph.D. 
The thesis deals with the design and implementation of acoustic modifications of a room in an apartment. The aim was to create a space with quality music presentation in one listening place. Despite the small dimensions of the chosen space, the aim was to improve the acoustic quality even at low frequencies. The design was based on calculated and measured acoustic parameters. Within the scope of the work, the entire project was implemented to a state that meets the requirements of the ČSN 73 0526 standard for a listening room. The space is used for music production and mixing, but also as a well-sounding home cinema.

Marek Šulc - Material flow optimization in a manufacturing company (2020)

Head Ing. Tomáš Řeřicha, Ph.D.
The aim of the thesis was to present methods for production optimization and subsequent implementation of selected methods directly into the real environment. The whole project was consulted with the head of the concerned plant, comments and suggestions were used to optimize the solutions described above. The proposals developed within the work were presented to the management of the company. A redesign of the workplace was proposed, which will lead to the optimization of routes and movements of workers or products, and therefore to the elimination of delays. The result of the example described above shows that these solutions can bring quite significant savings in time and therefore costs.

Pavel Rous - Diagnostics of electronic assemblies using X-rays (2021)

Head doc. Ing. František Steiner, Ph.D.
The thesis deals with diagnostics of electronic assemblies using computed tomography. The thesis describes the functions of computed tomography and X-ray, the most common defects of electronic assemblies and diagnostics of various defects using destructive and non-destructive methods including their evaluation. The methods are compared and evaluated on the basis of their results and suitability for different types of defects. In the practical part of the thesis, recommendations for the selection of appropriate X-ray tube performance parameters and their influence on the resulting image are included.

Martin Janda - Testing Printed Temperature Sensors for Precision Agriculture Applications (2020)

Head Ing. Silvan Pretl, Ph.D.
The work is focused on testing of printed temperature sensors for use in precision agriculture. It describes the basic principles of modern precision agriculture and the connection with temperature sensors. The thesis also describes the properties of thermistors and the possibilities of environmental testing. It presents a test plan for evaluating the properties of various printed thermistors. It also discusses the analysis of the outputs of the test plan. Finally, it explores the possibilities of applying mathematical models to the sensors in question.

Jiří Hlína - Substrates for power electronics realized by thick film technology (2019)

Supervisor prof Ing. Aleš Hamáček, Ph.D. 

Abstract
This dissertation deals with the issue of power substrates, especially power substrates realized by thick film technology (TPC technology). The first part of the thesis describes conventional power substrates, ceramic materials used for their production and power substrates realized by TPC technology. The experimental part of the thesis is focused on advanced power substrates realized by TPC technology. This part of the thesis describes the experiments performed and results obtained in the field of multilayer TPC structures, TPC layers on ceramic aluminum nitride substrates and resistive networks compatible with TPC technology.

Petr Kadlec - Electroinsulating composite materials with reduced flammability (2019)

Supervisor doc. Ing. Radek Polanský, Ph.D.

Abstract
The present dissertation deals with the issue of electrical insulating composite materials, which are intended primarily for the cable industry and are to meet the requirements for reduced flammability and overall highest safety of cable lines for lower voltage levels in indoor and outdoor environments. The composites of interest are those consisting of a polyethylene matrix, a clay filler called tubular halloysite and possibly other additives. Tubular halloysite is a filler that is still little used industrially, although the particle structure of halloysite is unique, at least among aluminosilicates. The reason for the efforts to use this filler in polymeric electrical insulating materials is mainly its ability to positively influence the course of thermo-oxidation reactions of polyethylene and thus contribute to the fire retardant properties of the resulting composite. The aim of the dissertation is to prepare and then comprehensively characterize composites consisting of a specific type of polyethylene and halloysite according to a proposal based on research activities. Attention is paid mainly to the influence of halloysite on thermal, dielectric and mechanical properties. In addition to the analysis of the basic two-component composite, the effect of the addition of a mixture of additives designed to provide higher oxidation stability and better extrusion processability is also investigated. A comprehensive analysis of the materials in a short post-production state is performed, as well as an analysis of materials subjected to accelerated thermal and ultraviolet aging. Based on the results of the aging experiment, possible degradation mechanisms of the tested materials are defined. The analyses performed show that tubular halloysite does not represent an exceptional flame retardant for polyethylene, but still shows a positive effect on thermal properties. A positive finding is also the improvement of some mechanical and dielectric parameters of composites with a certain proportion of halloysite. According to the accelerated ageing results, the tested composites can be considered more resistant to thermo-oxidation and less resistant to photo-oxidation.

Michal Čermák - Halloysite nanotubes as a new nanofiller for cable polymer blends (2019)

Supervisor prof Ing. Aleš Hamáček, Ph.D and doc. Ing. Radek Polanský, Ph.D.

Abstract
The presented work summarizes the findings in the field of the use of Halloysite nanotubes as a promising nanofiller in cable polymer nanocomposites, where increased fire safety is required. The introductory chapter therefore focuses on the development of technical standards and legislative measures within the European Union, which have dramatically increased the requirements for the technical parameters of cables intended for the construction industry over the last years, especially in the area of cable reaction to fire. Subsequently, attention is focused on the theory of formulation of polyolefin matrix blends, in particular on the influence of functional fillers and nanoadditives on the resulting characteristics of polymer composites and nanocomposites. The next chapters of the theoretical part of the thesis summarize the findings describing the physical properties of Halloysite nanotubes in polymeric systems, the possibilities of their surface functionalization and the perspective directions of their use for the field of polymeric fire retardant compounds intended for cable applications. In the introduction of the practical part, the experimental concept and solution methodology is presented, which consists of three experimental stages. In the first stage of the experiment, attention is focused on a comprehensive description of the effect of Halloysite nanotubes grafted with (3-Aminopropyl)triethoxysilane in a polyolefin type polymer system. For this purpose, a matrix of model insulating mixtures with different levels of this nanofiller was designed and prepared using a laboratory Brabender kneader. The second stage is aimed at applying the findings of the first stage in the formulation of a matrix of mixtures usable as sheathing fire retardant mixtures for low voltage applications in the construction industry. Based on the results, the formulation for the third stage of the experiment was selected. In this final stage of the experiment, the optimization procedure of the selected formulation for the Buss co-kneader technology is outlined and a comparative analysis with reference and competitor solutions is performed. The completion of this work was carried out in collaboration with SILON s.r.o. This collaboration led to the development of a prototype high fire retardant jacketing compound containing Halloysite nanotubes.

Pavel Totzauer - Aspects of the use of biodegradable electrical insulating liquids (2019)

Supervisor prof. Ing. Pavel Trnka, Ph.D.

Abstract

The aim of the presented work is to present possible ways to improve the parameters of vegetable oils for use as electrical insulating fluids. The monitored parameters were selected due to their influence on the long-term usability of vegetable oil in transformers. The actual work starts with an overview of the development, current status and modern trends in the field of dielectric fluids. The main part of the thesis deals with the experiments carried out, which focus on the influence of electrical stress, oxidation processes and their limitations, the interaction of water with vegetable oil and finally the influence of nanoparticles on the ester liquid with emphasis on the long-term applicability. The results obtained are confronted with the technical standards, which are still evolving, and therefore further modifications of some limit values are proposed. Finally, a summary of the work presented, an evaluation of the knowledge obtained, and a confrontation of the results obtained with the technical standards are made, thus guaranteeing compatibility for practical use.

Ladislav Zuzjak - Advanced Method for Measuring Parameters of Multichannel Sound Systems (2019)

Supervisor Ing. Oldřich Tureček , Ph.D.

Abstract

Multi-channel sound systems are currently used in many different applications, whether for sound reinforcement of film or music productions, or in specific situations, for example, to enhance the quality of listening in a rugged or acoustically unsuitable listening space. A separate area of application for multichannel sound systems is the interior sound system for automobiles. The specific characteristics of automotive sound systems are the relatively large sound area in relation to the distances of the electroacoustic transducers from each other and from the listeners, the limited possibilities for mounting the transducers and the significant proportion of secondary sound propagation paths, both by sound reflections and by vibration propagation of parts of the car structure. To compensate for these limitations, multichannel sound systems in automobiles are equipped with relatively extensive signal processing capabilities, both in terms of frequency and dynamic adjustments to the sound and in terms of adjusting the delay in the individual channels of the system. In connection with the development of multi-channel sound systems, corresponding measurement methods are rapidly developing which can be used for the design and adjustment of the various parameters of these sound systems. This dissertation is devoted to the design and implementation of a measurement method that can be used to optimize the settings of multi-channel sound systems used in automobiles. The primary parameters measured are the frequency characteristics and frequency dependence of the delay of each channel of these sound systems under specific sound field conditions in the automobile.

Jan Šimota - Methodology for modelling and risk management in electrical engineering (2019)

Supervisor doc. Ing. Jiří Tupa, Ph.D.

Abstract

This thesis deals with the design of a methodology for modelling and risk management in electrical engineering. In the introductory part it summarizes the issues of process control and the methods used for process control, visualization and simulation. It then summarizes the issues of risk management theory. The thesis further defines small and medium-sized enterprises and the general objectives for the development of a DSS system, from which a methodology is then proposed based on an innovative approach in risk management. This methodology has been developed based on the research of the current state of the art by means of research and determination of key aspects for its design with subsequent implementation in the development of a risk and process management system for SMEs in the electrical engineering sector. The individual phases of the proposals were presented as outputs at international conferences and partly used in the framework of the international Marie Curie project. The methodology is subsequently designed through a functional model with a detailed description of its structure and modes of use. Possible further research directions are discussed.