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Gearbox for portable power generator
Kolka, Roman ; Hubáček,, Tomáš (referee) ; Bradáč, František (advisor)
The submitted project deals with a complete design of a gearbox of a portable ground power generator designed for preflight preparation of helicopters. The gearbox has been designed to meet given specifications, which are based on required electrical parameters of the entire power unit and with regards to parameters of driving turbine engine. The introductory section deals with a kinematical design of transmission gears with regards to required parameters and design constraints. The kinematical design determines whole concept and resulting form of the gearbox. Next part deals with optimization of gearing, the design of wheel bearing, and design of oil system. The implementation part of the project consists in the engineering design of the gearbox, which was made in 3D environment Pro/Engineer. The design is reviewed and first operational results of manufactured and tested gearbox are discussed in the concluding section of this work.
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The study wheeled undercarriages of mobile machines
Olšovský, Petr ; Škopán, Miroslav (referee) ; Kašpárek, Jaroslav (advisor)
The objective of this bachelor thesis is to summarize basic findings regarding various types of wheeled undercarriages that are used on contemporary machines. The first part of this paper deals with numerous requirements that should be fulfilled by the design of an undercarriage. The fulfilment of these requirements also helps to assess whether the design should be used for a specific machine. Another focus of this paper is to summarize all design solutions regarding propulsion, tyres, stabilizing elements and steering mechanisms. These solutions are compared to each other. Important design elements of wheeled undercarriages are described as well.
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Open-wheel aerodynamics
Babinec, Viktor ; Vančura, Jan (referee) ; Čavoj, Ondřej (advisor)
This bachelors thesis is focused on review of the aerodynamic charakteristics of the rotating wheels for formula cars. This paper describes the nature, origin and development of flow structures in the wheel area, affecting other parts of the vehicle. To create a holistic view of the aerodynamic charakteristics of the wheel, it is necesary to include impacts on changing wheel geometry while driving, which significantly changes the nature of the flow. Among the observed effects include deformation of the wheel, its camber, yaw and axle height.
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Classification and evaluation of rail wear
Nohel, Rostislav ; Frýza, Josef (referee) ; Galas, Radovan (advisor)
This bachelor’s thesis is focused on the wear of rails. In this thesis, the reader will be firstly introduced to the fundamentals such as nomenclature of wheel and rail, adhesion, adhesion coefficient, contact area, slip, traction characteristic and wear. Subsequently, the fundamental types of material wear (adhesive, abrasive and fatigue) will be explained, which occur in the wheel-rail contact. In the next part, the individual rail defects are analysed with respect to locations. The output of the bachelor’s thesis is overview and description of the most common rail defects which are usually caused by fatigue wear.
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Axles of modern cars
Tichý, Ondřej ; Vopařil, Jan (referee) ; Kučera, Pavel (advisor)
This bachelor thesis focuses on desicribing of common axle types, their modern solutions and modifications, which are brought by a usage of electronic and hydraulic systems, and discusses their properties as well. The next part of the thesis deals with types of axle differentials and their modern electronic substitutes. The most common brake types, brake assistant systems and main types of vehicle wheels are mentioned in the last chapter.
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The problems of production of railway wheels
Šimčík, Vladimír ; Kubík, Roman (referee) ; Kalivoda, Milan (advisor)
The main idea of this work is especially to make clear the principle of railway wheelset technology, consisting of wheels, axle and other necessary components. Based on available information sources, BONATRANS GROUP a.s. literature, practical advices, experience and knowledge of practical issues, the problems in the manufacture of railway wheelsets and proposals for their elimination will be named.
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Study of construction machinery for the type of chassis
Válek, Adam ; Kašpárek, Jaroslav (referee) ; Kubín, Martin (advisor)
The point of the Bachelor´s thesis is to present a complex study of chassis of construction machinery. In the chapters, deals with general assessment criterion of these chassis, contains list of most used types of undercarriages of construction machines and assesses their advantages, disadvantages and usability. The thesis also contains a treatise of selected less common types and assesses interaction between the type of undercarriage and traversing surface.
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New trends and material usage in bicycle frame design
Jelínek, Vladimír ; Němec, Karel (referee) ; Juliš, Martin (advisor)
Thesis in its first part summarizes the evolution of the bicycle from the draisine to the low wheels with a focus on the material of the frame of the bicycle. Also discussed in this section is an overview of small structural modifications, which were gradually used on a bike, like Bowden brake or the first type of transmission system. In the second part, the thesis describes the operating principles and types of suspension forks and disc brakes. Mentioned are materials that are currently used for bike frames with a focus on the advantages and disadvantages of each material used and its future anticipated use.
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Mobile Cranes Models Review
Škaloud, Martin ; Škopán, Miroslav (referee) ; Pokorný, Přemysl (advisor)
The thesis deals with mobile cranes with a lifting capacity of 50 tonnes. The introduction describes the basic concepts related to these machines. Followed by a general cranes overview. This thesis focuses on a brief description of wheeled and tracked mobile cranes. It describes the undercarriage of the wheeled cranes and undercarriage of the tracked crane and crawler crane with it’s basic elements. After that is described the structure of the upper rotating wheel and track mobile truck crane. In the overview are specified the current global producers and companies that already do not produce these machines. Follows the short overview about companies - Grove, Liebherr, Manitowoc, Tadano, Terex-Demag and CKD. In the next part are written more details about company Grove interesting systems which are used in theirs products. At the end of this work are given a table showing the mobile crane on a brand-wheeled chassis with a capacity of over 50 the summary table with belt manufacturers of mobile cranes with a lifting capacity exceeding 50 tonnes.
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