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Mathematical model of the start of a racing vehicle on an unpaved surface
Čech, Tomáš ; Porteš, Petr (referee) ; Svída, David (advisor)
Tato práce popisuje proces návrhu diskrétního matematického modelu systému kontroly trakce v prostředí programu Simulink, pro rozjezd závodního prototypu třídy Super Buggy. Pravidla této závodní kategorie značně limitují prostředky, které je možné pro zmíněný řídící systém využít, a to hlavně v oblasti povolených senzorů. Aby systém kontroly trakce bylo možné navrhnout i s těmito omezeními, byl pro zmíněný závodní prototyp na míru vytvořen měřící systém, který byl následně využit pro sběr dat nutných k vytvoření virtuálního dvojčete závodního vozidla. To bylo, společně s na míru vytvořeným samostatným algoritmem, využito pro simulaci ideálního startu, kterého je vozidlo schopno dosáhnout. Na základě dat z této simulace byl vytvořen nový referenční model, podle kterého dokázal systém kontroly trakce regulovat vozidlo bez nutnosti využití zakázaných senzorů. Tento systém byl poté s využitím virtuálního vozidla testován, nejprve při akceleraci z místa, proti výsledkům dosažených při rozjezdu na plný plyn a několika dalších uměle vytvořených vstupních signálech na povrchu, pro který byl systém navržen. Dále byla testována nezávislost akcelerace vozidla, řízeného systémem kontroly trakce, na okmažiku přeřazení. Jako poslední byly zkoumány schopnosti fungování systému na površích s koeficienty tření jinými, než pro které byl systém navržen. V kapitole 13 a v závěru byla diskutována potenciální implementace navrženého systému, jeho celkový potenciál, nedostatky a možnosti pro další zlepšení a budoucí vývoj.
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Integrated Measurement System for In-Field Compliance Testing
Chvalová, Aneta ; Morávek, Jan (referee) ; Dvořáček, Jiří (advisor)
As the number of renewable energy sources has increased, new installations have been subject to new requirements for their control, whether autonomous (responding to conditions at the point of connection) or dispatchable. An important step for the commissioning of photovoltaic (PV) plants is to perform compliance testing, which is sometimes only appropriate or necessary to perform in the field on a complete installed plant. The measurements are used to obtain a set of data which is then used to issue a certificate of correct operation (i.e. compliance with requirements). The main output is a measurement system assembled into a portable case that can be easily transported to the PV installation site and simply connect the measurement analyzer to both the AC at low voltage level (for recording voltage, current, power, frequency) and DC (for recording binary commands and signaling). Also included is elaborate documentation of the case itself.
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Measuring system for analysis of pressure relations in spray lubrication device
Popelka, Michal ; Vaverka, Michal (referee) ; Nevrlý, Josef (advisor)
This thesis deals with the selection and design layout of the measuring system for the analysis of pressure and flow conditions in the lubricating system and a particular pressure and flow sensors. Sensors were selected according to suitability for use in these conditions of measurements (pressure, flow, etc.). Work also includes the review and selection of data bus for converting the output signal from the sensor to the evaluation unit (computer). It also includes selection of the measurement software to analyze the values arriving from the sensors into the measurement computer, find the optimal conditions for lubrication of wheel flanges of rolling stock.
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Structure and Use of the Measuring System for Research of Lubrication Device
Brhlík, Rostislav ; Omasta, Milan (referee) ; Nevrlý, Josef (advisor)
This work deals with an adaptation of the measuring system for the functional analysis of the lubricant divider. Within the new structural design, there were used manometers, flowmeters and dynamic scales to determine the properties of the lubrication system; data acquisition card and the appropriate software were designed too. The methodology of data measuring and analysis were also elaborated. The methodology is based on the experience from measuring, which was realized with the lubrication system OK - 02 from Tribotec Company. Finally, the cascade lubricant dividing system was designed. This is a newly designed flow divider with an innovative internal layout. The aim of the proposed measurement system is an optimization that will lead to effective dividing of lubricating mixture and applying the necessary amount of lubricant to wheel flange.
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Assessment effects substandard tributaries flowing a proportion on Q/h characteristics thin-plate weir with a rectangular cutout
Šmidrkalová, Nina ; Šafář, Robert (referee) ; Žoužela, Michal (advisor)
This master´s thesis deals with the problem of measuring flow, especially using the method of Q/H characteristics. It describes the thin-plate weir and mentions specific channels. The master´s thesis suggests options of monitoring flow capacity in fixed proffiles with free surface. The master´s thesis also includes an experiment, which is focused on simulation of substandard tributary flowing proportions before weirs for determining their effect on Q/H characteristcs. The experiment is carried out on a thin-plate weir with a rectangular notch at the Department of Water Structures at the Faculty of Civil Engeneering in Brno. Another part of the master´s thesis is data processing to get an idea about the impact of the phenomenon in real applications. Finally, options are recommended for follow-up research.
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Vibration and Acoustic Emission Reduction of Powertrains using Virtual Engine
Svída, David ; Kovář, Rudolf (referee) ; Dundálek, Radim (referee) ; Kovář, Rudolf (referee) ; Dundálek, Radim (referee) ; Píštěk, Václav (advisor)
Doctoral thesis deals with combustion engine cranktrain vibrations and vibration analysis methods. The work applies new computational models aimed at powertrain vibration decrease. The computational models can be used in the first stages of powertrain development. Temperature dependences of the rubber shear modulus and loss factor characteristic are found by response analysis of the free damped vibrations in the first part of the thesis. Viscoelastic model parameters of two dampers with different rubber hardness are calculated using optimization methods. Temperature distribution inside the rubber part during the harmonic oscillation is calculated with the knowledge of previous values. Computational models together with a user interface are assembled in Matlab/Simulink software tool. Computational model results of the viscoelastic rubber damper are verified by measurements on a prototype diesel engine in the whole operating engine speed range. Torsional vibrations of the crankshaft with torsional damper are measured by POLYTEC laser rotational tools. The temperature distribution on the damper surface is obtained by Infratec VarioCAM thermographic system. Combustion pressures in the cylinder are measured by SMETEC Combi indication tools. Both the temperature distributions and combustion pressures are used for computational purposes. All the measurement procedures are described also in the thesis.
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Wireless communication link analyzer
Dostálek, Jakub ; Burian, František (referee) ; Jílek, Tomáš (advisor)
The aim of this bachelor thesis is to design and implement a wireless communication analyzer in mobile robotics, using IPv4 protocol and Ethernet interface and to create correctly selected and expressed characteristics from the measured data, according to which the wireless communication channel can be further optimized for the best data transmission. To meet these requirements, a brief search of existing solutions was performed, their applicability was discussed and important parameters of the wireless transmission channel were defined, which will form the given characteristics. Furthermore, the actual design and implementation of a wireless communication link analyzer for previously specified required parameters, verification of its functionality on the transmission link with known parameters and automation of measurement and data evaluation was performed.
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System for verification of the signal quality dependence of a laser vibrometer.
Skalský, Ondřej ; Čala, Martin (referee) ; Pikula, Stanislav (advisor)
This thesis deals with a general theoretical description of the laser Doppler vibrometer with respect to parasitic phenomena, the design and implementation of a measurement system verifying the effects of these phenomena and the measurements performed. For a better understanding, the theoretical part includes not only a discussion of the principles of the laser Doppler vibrometer and its parasitic effects, but also the principles that the laser Doppler vibrometer uses to operate and on which it is based are discussed in detail. Mention is also made of vibrometers of other principles. The practical part of the thesis deals mainly with the design and implementation of a measuring system that can measure the dependence of the quality of vibration measurement on the angle and distance of the surface. This includes, of course, the presentation of the measured data, which to some extent confirms the theoretical assumptions, but also reveals new findings.
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Experimatal Analysis of Windshield Wipers Motors
Dočekal, Martin ; Mach, Martin (referee) ; Hájek, Vítězslav (advisor)
The work deals with the methods of measurement of small DC motors, especially motors used for drives wiper’s mechanisms. Furthermore, describing the internal structure and function of wiper’s engines. Measurement of these engines is carried out mainly dynamometers which is described in more details in the work. However, measuring systems consist not only from the dynamometer but also many other components such as controllers, software for testing engines, various stands, temperature and speed testers, and many others. These components are taken into account, when selecting the most suitable measuring system. There are also various systems analyzed and compared in terms of both technical and economic parameters, but also in terms of measurement options, such as immediate viewing characteristics on a PC monitor of the system assembly, the possibility of measuring the friction torque, efficiency, heating, etc. In conclusion, there is a recommendation of measuring system which I chose as the best option according to its parameters.
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