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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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Tyre Radial Stiffness Measurement
Novodomský, Tomáš ; Vančura, Jan (referee) ; Hejtmánek, Petr (advisor)
This thesis deals with the radial stiffness of a tyre. The first part of is devoted to a brief description of a tyre construction. The next part is devoted to measuring the radial stiffness of a tyre and the design of a new measuring device. The last part of the thesis deals with the influence of the radial stiffness of a tyre on the vertical dynamics of ta vehicle and simulations of this effect in the MATLAB / Simulink software.
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Fate of microplastics in soil
Kameníková, Eliška ; Řezáčová, Veronika (referee) ; Kučerík, Jiří (advisor)
The problems with microplastics, small plastic particles contaminating the environment, is a subject of heated discussions today. It has been recognized that the microplastics are not inert, but instead they have an impact on all enviromnental compartments. There are studies describing the negative effects of microplastics, for example on fauna and flora or on human health, but the effects on soil quality have not been sufficiently described. The aim of this thesis was to assess the short and medium term effects that microplastics could have on the soil. In this work, a series of experiments were performed to elucidate the fate of microplastics in the soil. Changes in soil organic matter thermal properties, soil respiration, amount of water and soil aggregation depending on the incubation time were monitored. Three types of agricultural land (chernozem, cambisol and phaeozem), which were contaminated with different concentrations od PET and tyre rubber, were tested. The results confirmed the specific effects of microplastics on soil properties, which were observed in non-incubated samples (i.e. at the time of incubation 0 months), microplastics did not behave inertly in the soil and affected, for example, soil properties, texture and respiration.
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Life termination of automotive tires
Poul, Ondřej ; Dvořáček, Jiří (referee) ; Brandejs, Jan (advisor)
Objective of this bachelor thesis is characterization of pneumatic tyre abolition. Discarded tyre amount detection, methods and possiblities of recycling and its evaluation is related. Part of the thesis is also reasoning on next utilization of the materials. Conclusion includes delimitation of future developments.
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Design of Device for Tyre Rolling Resistance Measurement
Piskoř, Martin ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The aim of this thesis is a construction concept of tyre rolling resistance measuring device. The first part deals with the rolling resistance. It describes its causes, its influential factors and it also includes rolling resistance identification methods. The second part deals with construction design of the rolling resistance measuring device itself. It contains stress analysis, and fatigue analyses as well. It includes selection of transducers used for tyre rolling resistance measuring and also measurement error analyses. The last part focuses on estimated financial requirements connected with producing and assembling the designed measuring device.
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Vliv huštění pneumatik na spotřebu paliva a výkonnost traktorové soupravy
Čuba, Norbert
The bachelor thesis deals with the influence of tractor tyre inflation on fuel consumption, slip and tractor performance in off-road conditions. It focuses on machine output parameters such as tire slip and hourly fuel consumption. The actual measurement of these parameters was carried out at three different tire pressures and keeping the tillage depth constant. The result of the field measurements is a confirmation of the fact that lower tyre pressures result in lower wheel slip and, at the same time, lower machine fuel consumption. These results are tabulated and graphically presented.
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Measuring tyre characteristics in the longitudinal direction on a Formula student car
Dvořák, Daniel ; Fojtášek, Jan (referee) ; Míša, Jiří (advisor)
This diploma thesis deals with longitudinal characteristics of tyres. Its goal is to create measuring algorithm and a whole process of measurement for these characteristics. The introductory part contains descriptions of key parameters. Following is the description of specific procedures leading to determination of these parameters. Thesis also includes description of sensors which are used for measurement of key parameters. The emphasis of the thesis is targeted towards keeping the costs low and making the whole process as repeatable and simple to prepare as possible. The proposed methodology in this thesis considers use of measured data in combination with data determined by performing analysis in Adams View. This analysis is necessary for determination of values of our coefficients, which deal with anti-feature parameters of the suspension. The final data processing and evaluation of the results is performed in MATLAB software.
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Rolling Resistance Coefficient of Tires
Hasala, Matěj ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This bachelor thesis focuses on the rolling resistance coefficient of tyres both in terms of the factors that influence this coefficient and in terms of experimental methods for its determination. In the first part of the thesis, the key factors affecting the rolling resistance coefficient are discussed in detail. This is followed by a description of the methods used to measure rolling resistance in laboratory and real-world conditions. The thesis continues with an overview of typical rolling resistance coefficient values for tyres of different categories, which have been further divided into subcategories and compared with each other. The last part of the thesis is devoted to the principal design of a measuring device for rolling resistance measurement. The design takes the cost and capability of obtaining a certificate of roadworthiness into account. Specific measuring instruments and components needed for the homologation process were selected and price calculation of known parts was made.
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