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Crank mechanism of a four-cylinder in-line gasoline aircraft engine
Doležal, Jakub ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
This thesis is focused on design of a steel connecting rod for the aircraft engine Walter Mikron III C produced by Parma-technik s.r.o., which could be an alternative to the existing aluminium alloy connecting rod. Research of aircraft engines and connecting rods is done before the design work itself, together with explanation of the calculation of dynamic stresses in the crank mechanism. In practical part, design of the crank mechanism is analysed, followed by the calculation of its dynamic stresses, analytically and by 1D simulation in the GT-Suite Cranktrain software. Connecting rod strength analysis is performed by analytical calculation, which is verified by FEM analysis in Ansys Mechanical software, both approaches evaluating connecting rod tension and fatigue safety. Similarly, the steel connecting rod is designed and evaluated in two designs, with an I and H shank. Drawing documentation of both designs of the connecting rod is output of this thesis.
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Designing a virtual world for testing autonomous vehicles
Turek, Martin ; Píštěk, Václav (referee) ; Kučera, Pavel (advisor)
The bachelor's thesis deals with a design of a virtual world for testing autonomous vehicles, which is based on a real location in the Czech Republic. A vehicle controlled by a flawed autonomous driving algorithm or ADAS system potentially poses a major safety risk to all road users. Because of that everything needs to be tested very thoroughly, with a virtual simulation environment being a cost-effective alternative to the expensive testing of prototypes in the real world. A detailed virtual representation of the selected location was created in the RoadRunner software using digital maps and photographs. The functionality of the created world was verified in Unreal Engine through a simple simulation designed in the Simulink environment. The output of this work is a functional virtual environment, representing the immediate surroundings of the FME in Brno. The created world contains all important road infrastructure, and the visual authenticity of road surroundings is achieved by the placement of 3D models of real objects.
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Ammonia as an alternative fuel
Radil, Jan ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
Replacing current fossil fuels as one of the main causes of the high levels of unwanted particles in the air with greener alternatives is growing in importance every year. In recent years, ammonia has become one of the most frequently investigated alternative fuels with the potential to reduce greenhouse gas emissions in the transport and energy sectors. This bachelor thesis examines the issue of this substance in the context of its use as a fuel. Thesis brings an overview of the current state of research and development of ammonia as an alternative fuel and highlights its potential and challenges in the transition to a low-carbon economy. The reader is introduced to the basic properties of ammonia, production, transport and storage technologies. Comparisons with other fuels, in particular hydrogen, as another alternative fuel are also included. An overview of the possible applications of ammonia as a fuel in current internal combustion engines and fuel cells is also given. This overview is supported by several studies and researches that are currently dealing with this issue. Besides this, the thesis also mentions the most discussed projects for the application of ammonia as a fuel in the automotive and marine industries. In conclusion, all the collected informations are summarized and specific conclusions are drawn in terms of possible future applications of ammonia as a fuel.
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Lane detection for autonomous vehicles
Holík, Štěpán ; Píštěk, Václav (referee) ; Kučera, Pavel (advisor)
This thesis focuses on the design and experimental verification of a system for lane detection, trajectory estimation and vehicle position. The goal was to develop a system composed of algorithms with its respective functions. Data collected with ZED 2 camera, the U-Net neural network model, and computer vision were used to reduce false positive predictions using a temporal window. Trigonometric calculations and camera parameters were used to estimate the vehicle’s position relative to the trajectory. One of the outcomes of this thesis is TuSimple dataset extension with the data captured with ZED 2 camera. Experimental verification demonstrated the system's functionality with high detection reliability in simple model situations, such as driving on a straight road segment. As the complexity of the model situations increased, the system's reliability decreases. Despite these shortcomings, the experiments showed that the system is able to detect lane boundaries and estimate an optimal vehicle trajectory. The algorithms for trajectory and vehicle position determination depend on the initial prediction of the lane boundaries, but they are functional and effective.
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Zlín FCK Technology
Kučera, Petr ; Pecka, Lukáš (referee) ; Štěpán, Marek (advisor)
The diploma work deals with the design of a residential building in the town of Malenovice u Zlína, where a new residential complex is to be built on the site of the former Malenovice sawmill. The land is located in close proximity to the main road to Zlín. The work proposes a modular house system made of prefabricated CLT elements with social and community overlap. A system that allows rapid construction and creation of buildings with different configurations according to the given requirements not only in the territory of Malenovice. The design system includes small-scale flats with elements of variable furniture, which allows to reduce the cost of housing, which is responding to the current unaffordable housing, but maintaining human comfort. The design also addresses the efficient use of technology on site and its sometimes excessive use.
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Neural networks used in autonomous vehicles
Ryšavý, Jan ; Píštěk, Václav (referee) ; Kučera, Pavel (advisor)
This bachelor thesis deals with the use of neural networks in autonomous vehicles. The first part of the thesis presents the basic principles of neural networks and learning methods that are used in autonomous vehicles. Then the thesis describes the architecture and functions of neural networks. The second part of the thesis also describes the different types of autonomous vehicles, their classifications and an overview of the sensors used by autonomous vehicles. The last part of the thesis deals with the implementation of neural networks in ECUs using programming languages and libraries, and applications such as object detection and marker recognition.
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Mixed-use building in Mikulov
Kučera, Pavel ; Klimecký, Martin (referee) ; Gerö, Jiří (advisor) ; Brzoň, Roman (advisor)
The bachelor's thesis follows a project developed within the subject AG035 Studio of Architectural Creation. The subject of the design is a multifunctional house in the place of the gap, which currently serves as a parking lot or marketplace. The multifunctional house is located close to the walls and castle gardens of Mikulov Castle - located in the urban conservation zone, which was declared in Mikulov in 1982. Due to the elevation of the plot and the street to which the design is adjacent, the multifunctional house is divided into three related parts. The outer parts are set aside for commercial purposes on the first floor (florist, newsagent, bistro). The second, third floor and attic offer a total of 8 apartments. The middle part is reserved only for a literary café. The design also includes underground parking accessible by stairs from the first floor of the outer parts of the multifunctional building. Entry and exit is provided by two ramps. An integral part is the culture of the remaining free space adjacent to the walls of the Mikulov castle. It will consist of gardens and a space/passage adjacent to the wine cellar located under the walls. At the same time, it will be possible to get from this passage to the area of the castle gardens by means of a designed elevator. The facades of all three parts of the multifunctional house are richly glazed and designed in white, beige plaster or pigmented concrete trowel. They take into account the fact that the multifunctional house is located in the urban conservation zone. The roof of the building is saddle with concrete covering in a traditional red-brown colour.
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European emission legislation
Rytina, Matěj ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this bachelor thesis was to write about exhaust emissions and their influence on environment, briefly sum issue of emission standards up and mainly sum existing facts about the “Dieselgate” affair up. I wanted to objectively evaluate this issue in my bachelor thesis. Asset of this thesis was mend to be in fact that this affair has not been academically covered yet.
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Gas exchange systems of two-stroke engines
Kovář, Michal ; Kučera, Pavel (referee) ; Píštěk, Václav (advisor)
This bachelor thesis is focused on the analysis of the development and critical evaluation of the gas exchange system of two-stroke engines. The aim of the work was to use research to concentrate various options for gas exchange system of two-stroke engines of various power categories, to describe individual solutions and point out the advantages and disadvantages of individual systems and then outline possible future developments in this area.
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Stabilizing systems of passenger cars
Odehnal, Jakub ; Vopařil, Jan (referee) ; Kučera, Pavel (advisor)
This Bachelor’s thesis describes basic stabilizing systems of passenger cars. These systems are correcting driving the cars and improve safety of the traffic. The main systems described in this thesis are ABS, ASR and ESP. There are also summarized some other assistant systems. In the end there is also view of various individual car companies and their theories of stabilizing of cars.
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