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Comparison of selected mechanical properties of aluminum alloys and structural steels
Belháč, Jakub ; Svoboda, Pavel (referee) ; Vlašic, František (advisor)
The subject of this bachelor´s thesis is a description of selected mechanical properties of metal materials and their comparison within aluminium alloys and constructional steels. The most common mechanical tests to quantify the mechanical properties are described here. The mechanical properties of constructional steels and aluminium alloys are separately described in subsequent chapters as well as their division and possibilities of application. The connection between structure, chemical composition and mechanical properties depending on a heat-treating process is shown.
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Draft automatic pressure pumping stations
Plachý, Jiří ; Vlašic, František (referee) ; Dvořáček, Jiří (advisor)
The aim of this thesis is a complete draft of automatic pressure pumping station for apartment house, including centrifugal pump with electric motor, control unit and accessories in the form of pipe system, valves and pressure elements. Thesis is focused on calculation and construction of centrifugal pump, which would be able to use separately without placement to the whole pressure station. The idea is to create the station with request to the higher water-flow against commonly available standards and equally to achieve small production proportion, weight and mobility of the facility. The construction is furthermore focused on supporting elements and general layout of pressure pumping station setup. All electronics, pipes and measurement parts are solved as a purchased elements.
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Centrifugal radial submersible water pump driven by hydrostatic motor
Holan, Jan ; Vlašic, František (referee) ; Nevrlý, Josef (advisor)
Bachelor thesis is aimed to a design of radial underwater pump with hydrostatic powertrain. Thesis contains base knowledge and working principles of water pumps and parts of hydrostatic powertrain. The other part is aimed to detail description of design and issues related to a water pump design. Thesis was created in cooperation with Center of hydraulic development (CENTRUM HYDRAULICKÉHO VÝZKUMU, spol. s r.o.).
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Design of a Chainsaw Mill
Hynek, Jakub ; Vlašic, František (referee) ; Ranuša, Matúš (advisor)
The bachelor's thesis deals with the construction of a mobile log saw with an adjustable cutting height and attachment to a tree trunk. Part of the work is a search of known solutions for mobile log saws. The next part deals with conceptual designs and the choice of the most suitable solution. Furthermore, individual structural nodes are elaborated for the selected design and the function of individual parts is described. At the end of the work is the evaluation of the proposed structure.
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Suspended bicycle carrier for buses
Svoboda, Pavel ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
This bachelor´s thesis describes the construction of universal the rack for bicycles to different types of buses. The aim was to produce a simple, lightweight, safe, affordable, accessible design of the rack for bicycles with easy the suspension, but also with the access to the engine compartment of the bus.
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Design of the feeding mechanism for L profiles
Witos, Anton ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
In this bachelor thesis was designed machine for feeding L profiles and end effector of service robot. Machine uses pneumatic piston to create frictional force between profile and feeding wheels. For movement of profile is used chain transmission which drive feeding wheels. End effector uses for work special type of electromagnet which uses electric voltage only for disabling. Thesis includes review of suggested solutions and choice of optimal solutions.
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Optimization of ultrasonic leak detector of pneumatic system
Macků, Ondřej ; Mazal, Pavel (referee) ; Vlašic, František (advisor)
The thesis deals with design and optimization of exchangeable modules for localization of air distributable ultrasound in concept of ultrasound probe design. Several series of these modules were manufactured using the technology of rapid prototyping and tested on artificially created source of air leak. Based on these verification experiments two types covering wide use for identification of pneumatic systems leaks were selected and modified. These two types are long range module for more accurate and expended reach of the leak detection and focusing attachment for narrowing the received range of scanning module and elimination of surrounding ultrasound. Part of the thesis is also analysis of the acoustic signal processed by modern acoustic emission analysers which allow besides standard parameters recording also continuous sampling up to 10 MHz and design solution for attachment of add-on modules to the detector. The thesis is beneficial for raising awareness of leak measurements, prototype manufacturing by using the 3D printing and designing and manufacturing of modules.
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Diagnostics of rotating parts mounting systems in a wind turbine nacelle
Krontorád, Jakub ; Vlašic, František (referee) ; Mazal, Pavel (advisor)
The core aspect of thesis is management of work and diagnostics of wind turbines. It contains an overview of wind energy in Czech Republic and collects a relevant information from international papers and studies regarding the topic of diagnostics and maintenance of main mechanical components located in nacelle of wind turbine. It contains a recommendation for improvement of working conditions of wind turbines and their maintenance, which would lead to decrease of failure rates of the wind turbines main mechanical systems due to the utilization of acoustic emission and high frequency vibrations monitoring. Experimental part of the thesis contains analysis of acoustic emission signal from anonymous wind turbine with maximum energy output of 2000kW in Czech Republic to illustrate the sensitivity of acoustic emission and introduce its principles.
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Modern trends in radiographic procedures and methods in defectoscopy
Skřivánková, Vendula ; Vlašic, František (referee) ; Juliš, Martin (advisor)
Presented thesis deals with modern trends and techniques in radiographic methods of crack detection which are recently used in engineering practice. In the first part, conventional (analogue) radiography principles based on creating a visible image of tested object to radiographic film are discussed. The next part is aimed to the digital radiography and radioscopy. To digitize existing X-ray film images, application of storage phosphor plates (CR), flat panels (DR) and computed tomography (CT).
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