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Mathematical model of the start of a racing vehicle on an unpaved surface
Čech, Tomáš ; Porteš, Petr (referee) ; Svída, David (advisor)
Tato práce popisuje proces návrhu diskrétního matematického modelu systému kontroly trakce v prostředí programu Simulink, pro rozjezd závodního prototypu třídy Super Buggy. Pravidla této závodní kategorie značně limitují prostředky, které je možné pro zmíněný řídící systém využít, a to hlavně v oblasti povolených senzorů. Aby systém kontroly trakce bylo možné navrhnout i s těmito omezeními, byl pro zmíněný závodní prototyp na míru vytvořen měřící systém, který byl následně využit pro sběr dat nutných k vytvoření virtuálního dvojčete závodního vozidla. To bylo, společně s na míru vytvořeným samostatným algoritmem, využito pro simulaci ideálního startu, kterého je vozidlo schopno dosáhnout. Na základě dat z této simulace byl vytvořen nový referenční model, podle kterého dokázal systém kontroly trakce regulovat vozidlo bez nutnosti využití zakázaných senzorů. Tento systém byl poté s využitím virtuálního vozidla testován, nejprve při akceleraci z místa, proti výsledkům dosažených při rozjezdu na plný plyn a několika dalších uměle vytvořených vstupních signálech na povrchu, pro který byl systém navržen. Dále byla testována nezávislost akcelerace vozidla, řízeného systémem kontroly trakce, na okmažiku přeřazení. Jako poslední byly zkoumány schopnosti fungování systému na površích s koeficienty tření jinými, než pro které byl systém navržen. V kapitole 13 a v závěru byla diskutována potenciální implementace navrženého systému, jeho celkový potenciál, nedostatky a možnosti pro další zlepšení a budoucí vývoj.
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Design of the hydraulic circuit of the ASC 110 vibratory roller drive
Novák, Martin ; Rada, Zdeněk (referee) ; Rada, Zdeněk (referee) ; Klas, Roman (advisor)
This thesis presents a proposal of newly designed concept for travel hydraulic circuit of vibratory single drum roller ASC 110. The maximum machine gradeability was chosen as the main parameter for hydraulic circuit proposal. After selecting the new hydraulic travel concept, suitable hydraulic components have been selected. Length and local losses for two different machine speeds were calculated for sufficient hydraulic circuit design. Hydraulic losses have also been calculated for use in different climatic conditions. A new machine cooling concept has also been proposed. Heating and cooling curves of hydraulic circuit were calculated. For the purpose of comparing gradeability and energy balance of the newly designed travel concept compared to the existing one currently in mass production, both machines were fitted with measuring points. On both machines were measured for example, pressure, flow and temperature in each hydraulic circuit branch and others. From the time dependencies of the above-mentioned parameters it was possible to determine the energy efficiency of the newly designed concept. To assess the maximum gradeability, the slope of the hill was measured. Comparing the two machines, it has been found that the two hydraulic circuit solution has significantly improved traction properties in demanding machine applications, especially when driving uphill and downhill. This concept also affects less fuel consumption and places less demand on the hydraulic oil cooler due to its energy efficiency.
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Design of the hydraulic circuit of the ASC 110 vibratory roller drive
Novák, Martin ; Rada, Zdeněk (referee) ; Rada, Zdeněk (referee) ; Klas, Roman (advisor)
This thesis presents a proposal of newly designed concept for travel hydraulic circuit of vibratory single drum roller ASC 110. The maximum machine gradeability was chosen as the main parameter for hydraulic circuit proposal. After selecting the new hydraulic travel concept, suitable hydraulic components have been selected. Length and local losses for two different machine speeds were calculated for sufficient hydraulic circuit design. Hydraulic losses have also been calculated for use in different climatic conditions. A new machine cooling concept has also been proposed. Heating and cooling curves of hydraulic circuit were calculated. For the purpose of comparing gradeability and energy balance of the newly designed travel concept compared to the existing one currently in mass production, both machines were fitted with measuring points. On both machines were measured for example, pressure, flow and temperature in each hydraulic circuit branch and others. From the time dependencies of the above-mentioned parameters it was possible to determine the energy efficiency of the newly designed concept. To assess the maximum gradeability, the slope of the hill was measured. Comparing the two machines, it has been found that the two hydraulic circuit solution has significantly improved traction properties in demanding machine applications, especially when driving uphill and downhill. This concept also affects less fuel consumption and places less demand on the hydraulic oil cooler due to its energy efficiency.
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Elektronicky řízené systémy motocyklů
Borovička, Marek
The content of the thesis is the summary of a modern electronic systems implemented on two-wheeled vehicles, especially motorcycles. The main part is devoted to the description of the injection and ignition systems. The thesis also deals with the principles of driver assistance systems and their functions. Explains the function of electronically controlled systems with a positive impact on safety, efficiency, effectiveness, environment, comfort and competitive conditions improves the performance of machines and riders. Electronic systems for motorcycles eperiencing currently great development, although some are adopted from other categories of vehicles, but regulators have been extensively adapted two-wheeled vehicles.
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