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Laboratory demonstrator for vibrodiagnostics
Blecha, Martin ; Krejčí, Jakub (referee) ; Klusáček, Stanislav (advisor)
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.
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Implementation of an IoT device for Smart Home
Popela, Vojtěch ; Krejčí, Jan (referee) ; Pokorný, Jiří (advisor)
The aim of this thesis is to acquainted with the concepts of Internet things, a smart home, and then design and implement smart home appliance – a kettle. The theoretical part of this thesis deals with the description of The Internet of Things, Smart Home, market research of Kettles, protocols used in the Internet of Things and analysis of functions to implement. In the first part of the solution a program for a control unitbuilt on the development board ESP8266 is created and the local control is put into operation. In the second part a web application is designed and put into operation. The third part of the solution contains photo documentation and project description. The fourth part analyzes power consumption and also includes a proposal for saving energy. The last part includes the design of printed circuit boards.
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Properties of the perspective ferroelectric materials
Krejčí, Josef ; Frk, Martin (referee) ; Rozsívalová, Zdenka (advisor)
This thesis studies the properties and the applications of prospective ferroelectric materials which are used in electrical engineering and electronic industry. Further are physically explained and mathematically described the basic principles running in their structure. The practical part is aimed to build a workplace for measuring the components of the complex permittivity in the frequency and temperature area, controlled by the programmed measurement and service application using the Agilent VEE Pro 8.0 and MS Excel. The functionality of the workplace was verified on the selected material samples by measurement and evaluation of selected properties. For this issue was created electronic text, which can be used as a guide for laboratory exercises and it is an integral part of this work.
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Thermal conductivity measurements
Krejčí, Jakub ; Bejček, Ludvík (referee) ; Beneš, Petr (advisor)
This bachelor thesis deals with non-stationary thermal conductivity measurement using line and point heat source. There are compared various methods thermal conductivity measurement and designed own correction for pulse duration. The practical part describes created exemplar for laboratory exercises including achieved results and comparing with simulations.
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Objective assessment and reduction of noise in musical signal
Rášo, Ondřej ; Makáň, Florian (referee) ; Krejčí, Jiří (referee) ; Balík, Miroslav (advisor)
The dissertation thesis focuses on objective assessment and reduction of disturbing background noise in a musical signal. In this work, a new algorithm for the assessment of background noise audibility is proposed. The listening tests performed show that this new algorithm better predicts the background noise audibility than the existing algorithms do. An advantage of this new algorithm is the fact that it can be used even in the case of a general audio signal and not only musical signal, i.e. in the case when the audibility of one sound on the background of another sound is assessed. The existing algorithms often fail in this case. The next part of the dissertation thesis deals with an adaptive segmentation scheme for the segmentation of long-term musical signals into short segments of different lengths. A new adaptive segmentation scheme is then introduced here. It has been shown that this new adaptive segmentation scheme significantly improves the subjectively perceived quality of the musical signal from the output of noise reduction systems which use this new adaptive segmentation scheme. The quality improvement is better than that achieved by other segmentation schemes tested.
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Universal Home Gateway for IoT Devices
Šelinga, Martin ; Krejčí, Jan (referee) ; Hošek, Jiří (advisor)
This diploma thesis consists of theoretical description of M2M communication and main differences comparing with H2H communication. There is also a description of protocols used in Internet of Things and description of practical implementation of protocols WM-BUS and Z-Wave in Python programming language with usage of Django framework.
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Comparision of methods for nonlinear dynamic sytems solution
Krejčí, Jaroslav ; Lošák, Petr (referee) ; Dušek, Daniel (advisor)
The aim of this work is to make a solution of nonlinear dynamic system with one degree of freedom using various approximate analytical methods and perform their comparison. The beginning of the work describes the basic characteristics of nonlinear dynamic systems, methods of modelling and a description of the basic analytical methods of solution. In the following part is the solution of the system using described methods and comparing of results. In conclusion the methods are compared with final element method by program ANSYS.
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Concept of hybrid telescopic handler with a modular platform
Krejčí, Jan ; Kašpárek, Jaroslav (referee) ; Škopán, Miroslav (advisor)
This bachelor´s thesis shows the possible future development of hybrid telescopic handlers with modular platform. In the first section is an overview of technologies, which are used in today’s manipulation, transport and construction machinery. The second part is focused on the concept which uses described technologies. There are mentioned aspects, why are these technologies useful for the telescopic manipulator. There is shown a modular platform as a new way of designing.
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Network components monitoring using Munin
Vicen, Šimon ; Krejčí, Jan (referee) ; Šilhavý, Pavel (advisor)
This thesis is focused on monitoring systems, particularly on network elements monitoring with emphasis on ways of how we can securely access monitored parameters in work with modules and plugins in Munin environment. Moreover the thesis analyze creating new plugins in Munin enviroment with graphical output of an HTML file.
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Condition monitoring of engine block machining - Plasma
Váško, Ondřej ; Krejčí, Jakub (referee) ; Pikula, Stanislav (advisor)
The aim of this thesis is to design and implement two methods of predictive analysis for company Škoda Auto a.s. In the first part I have conducted a literature search on methods of predictive diagnostics. In the next part, with help from thesis consultant in Škoda Auto a.s., the analysis of the assembly line and data blocks from machinery and measuring has been made. Then I designed and programmed data generator based on real data. I created two methods of predictive diagnostics, capable of analyzing input data and deciding about their condition. In the end I tested these two methods and evaluated accuracy of their prediction. Main output of my thesis is two methods of predictive diagnostics, feasible in real world.
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