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Issue of asphalt mixtures with coarse-grained aggregates
Koblížek, Ondřej ; Hýzl, Petr (referee) ; Dašek, Ondřej (advisor)
The diploma thesis deals with the design of asphalt mixture of asphalt concrete type for base courses with maximum aggregate grain up to 32 mm and investigates the influence of the amount of asphalt binder on the properties of this mixture. The theoretical part describes the problem of aggregate shortage in the Czech Republic and the division of aggregates into various categories. In the next part, the laboratory used tests (needle penetration determination, softening point determination, compaction degree, determination of the stiffness modulus, low temperature properties and wheel tracking) are described in detail. The practical part describes the used materials, the results of the laboratory tests, their comparison and evaluation.
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Coarse-grained asphalt mixtures
Brida, Peter ; Hýzl, Petr (referee) ; Dašek, Ondřej (advisor)
The diploma thesis is focused on the comparison of the influence coarse-grained aggragate on the properties af asphalt concrete. The theoretical part describes issue of production and usage of asphalt mixtures. The practical part evaluates multiple types of asphalt mixtures and describing their properties. Stiffness by a two-point bending test, a wheel tracking test and low-temperature cracking and properties by uniaxial tension test were used to evaluate the properties of the mixtures.
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Radial gantry crane
Dvořák, Milan ; Pokorný, Přemysl (referee) ; Malášek, Jiří (advisor)
The goal of this Bachelor’s Project is to develop a structural design of special construction of Radial Gantry Crane by entered parameters, it will be used in enclosed space to manipulation with various materials. The structural design will be done by basic set parameters, which as geometrically, so statically they declare workspace in industrial hall or industrial workshop and subsequent manipulation of worker with a construction crane during operation. As each design of machines, so and structural design of Radial Gantry Crane is based on the strenght design calculations, from which follows the choise of suitable material, which declares the cost of production and operation of Radial Gantry Crane. Special attention will be given to alternative designs mobile supports, whose basic parameters such as stiffness, weight and shape determine the size of the frictional forces between the wheels and the floor rails mobile workspace, implying stress of the whole structure Radial Gantry Crane when operating in loaded condition.
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Analysis of frame of road bicycle
Šustr, Dominik ; Hloušek, David (referee) ; Pokorný, Přemysl (advisor)
This bachelor's thesis deals with the FEM analysis of the stiffness of the REPETE R2: REASON road bike frame according to the stiffness testing methodology in EFBE laboratories. The theoretical part describes the most important facts about the design of the analyzed frame and the history of brands that are important for the frame. The empirical part then summarizes the results of the FEM analysis, thanks to which we revealed the area around the bottom bracket as the weakest structural point of the frame, which can have a negative effect at higher loads. It probably also makes more sense to orient the pipe cross-sections horizontally.
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Development And Verification Of A New Method For Measuring The Stiffness And Damping Properties Of Joints In Parallel Kinematic Structures
Kolouch, Martin ; Tomáš, Jiří (referee) ; Knoflíček, Radek (advisor)
In this dissertation is presented the development of a new measurement method for the stiffness and damping characteristics of a joint in a parallel kinematic machine tool. The main contribution of this method is specially for applications, that demand accurate information about stiffness and damping parameters from assembled parts of machines tool. Methods for compensation of deformations in machines tool, that are carried out by control, belong to these applications. Another contribution of this work is the technical implementation of the proposed principle of the new method. At this point the focus of the work was devoted to signal processing, that differs in a certain degree from other types of signal processing methods, that are used in other dynamic measurements, e.g. modal analysis. One of the main requirements was the possibility to consider the nonlinear behavior of the measured structure. In another chapter the modified signal processing method was used for measuring a joint in a test rig. The results were compared with results from other measurement methods. On account of this comparison the statement was made that the new method can be used for measuring the stiffness and damping parameters of machine parts. Finally the new method was applied to measure the properties of a joint, which was built in a machine tool. Moreover, the problems, that appeared during the measurement, were also described.
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Bituminous mixture desing with the use of 30 % reclaimed asphalt and its functional evaluation
Horáček, Daniel ; Šperka, Pavel (referee) ; Kudrna, Jan (advisor)
The aim of my bachelor thesis is to design asphalt mixture with a higher lifetime (mixture of type VMT 16) and its subsequent assessment by selected functional tests. VMT blends are used for load and underlayer layers of roads with higher transport loads. The main idea of this bachelor thesis is the design of an asphalt mixture consisting of natural aggregates, recycled asphalt mixtures and crumb rubber modified bitumen, yet retaining good road-holding properties. The use of recyclable bituminous mixtures will allow the recycling of bent or milled asphalt layers, which is currently high in surplus, and will allow the overall cost of building new high-quality asphalt layers to be reduced. The bachelor thesis describes the empirical and functional tests performed, according to which the resulting asphalt mixture was designed, and the results compared with the TP151 Asphalt mixture with high modulus of stiffness (VMT).
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Measuring the flexibility of vehicle suspension components
Gadas, Petr ; Zháňal, Lubor (referee) ; Míša, Jiří (advisor)
This bachelor’s thesis describes suspension kinematics and elastokinematics of vehicle axles, contains the design and manufacturing method of a jig, designed to measure kinematic complience of each suspension assembly, and deals with the measuring process and data evaluation. The goal is to measure the stiffness behaviour of suspension components of a Formula Student car Dragon X and to assign it to a multi-body software suspension model, which will result in a more detailed vehicle model, to achieve simulations that are closer to reality.
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