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Vehicle Hydropneumatic Systems
Ševčík, Michal ; Míša, Jiří (referee) ; Blaťák, Ondřej (advisor)
This work deals with hydropneumatic suspension systems. It is a narrow development branch of suspension that has a stable position in the current market. It brings with it a number of key functions that can be essential to the main workload of certain machinery. The downside of these features is often the design and financial complexity of the system. For this reason, the system is mainly compared with the classical concept of conventional suspension systems with steel springs. The wide range of functions that the system can provide is also described. Based on the theoretical knowledge, the concept of a hydropneumatic suspension system for the Ford TRUCKS 1833 DC is proposed. A series of calculations are performed to determine the basic parameters of the system. The obtained results are used to select system components from the current market offer. The hydraulic cylinders, which are one of the main components of the hydropneumatic units, are designed specifically for the vehicle based on strength calculations.
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Design of suspension for an electric off-road motorcycle
Hlaváč, Pavel ; Hejtmánek, Petr (referee) ; Míša, Jiří (advisor)
This master thesis deals with the design of suspension for an electric off-road motorcycle. The aim is to determine the optimum damping force and spring stiffnesses for a motorcycle with given parameters for different rider weights. Some input parameters had to be measured, such as tire stiffness and damping, fork and shock damping of the same type of motorcycle. Other damping forces were created using the measured ones to cover wider range of damping ratios. Then these forces and spring stiffnesses were tested in quarter car and half car models to evaluate the changes in suspension setting on rider comfort a ride safety. Then the ideal damping forces and spring stiffnesses for an electric off-road motorcycle are determined from the simulations performed.
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Design of Electric Urban Vehicle Chassis Components
Nebus, Martin ; Míša, Jiří (referee) ; Hejtmánek, Petr (advisor)
This thesis deals with the design of the chassis components of an electric urban vehicle and its final structural design. The introduction of the thesis contains the division of electric urban vehicles into different categories, which differ in various technical parameters. Subsequently, the different chassis components and their structural designs that can be found on these vehicles are mentioned. A conceptual design is involved in the selection of suitable parts, either commercially available or calculated to meet criteria such as functionality and reliability. The structural design, which has been developed based on FEM analyses, simulations and calculations, provides the final design of the chassis, brake and steering parts.
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Design of Electric Urban Vehicle Drive System
Pitoňák, Adam ; Míša, Jiří (referee) ; Hejtmánek, Petr (advisor)
This diploma thesis sets itself into the task of presenting a conceptual design of a powertrain system intended for a small electric vehicle of the L6e category. As a part of this thesis, in the initial part of this work, a survey of components and their optimal arrangement in the powertrain system of a small electric vehicle was carried out. Subsequently, after the presentation of the possible components of the powertrain system, testing of these variants was carried out, both form a mechanical and an electrical point of view, to guarantee the compatibility of the individual parts of the vehicle´s powertrain system. After the evaluation, the optimal variant of the drive system, intended for the concept on a small electric vehicle “Nanos” was selected. To determine the acceleration characteristics and the range of a vehicle equipped with such designed powertrain system, series of acceleration tests as well as vehicle range test according to the first part of the official WMTP cycle, intended for vehicles belonging to the category L6e, were performed. The resulting values of the vehicle´s acceleration and range tests are subsequently compared with the values of already existing vehicles belonging to the same category, thus enabling an overall evaluation of the powertrain system concept.
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Design of a torque vectoring control system for a Formula student vehicle
Gadas, Petr ; Blaťák, Ondřej (referee) ; Míša, Jiří (advisor)
Tato diplomová práce se zabývá problematikou zvýšení výkonu vozidla při jízdě zatáčkou pomocí aktivního řízení hnacího momentu závodního vozu kategorie Formule Student. Náplní práce je návrh, simulace a následně testování algoritmu, který na základě zvolených parametrů řídí rozdělení momentu na hnané nápravě, aby bylo dosaženo optimálního stáčení vozidla pří zatáčení. Systém byl navržen na základě cíleného dynamického chování vozu při průjezdu zatáčkou. Pomocí virtuálního prostředí byly obdrženy simulační klíčové výsledky vlivu na chování vozidla, které byly následně validovány testováním na trati. Celkovým cílem práce bylo navýšení jízdní rychlosti a kontroly and vozidlem během zatáčení, s výsledkem snížení jízdního času na trati.
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Wheel centre design for a composite rim of a Formula student vehicle
Baráni, Michal ; Hejtmánek, Petr (referee) ; Míša, Jiří (advisor)
This bachelor's thesis deals with the research of wheel hubs and rim attachments in the area of Formula cars. Based on the research, the aim is to design a structural solution for the wheel hub of a Formula Student car and subsequently verify its correctness using finite element analysis under appropriate boundary conditions. The design primarily focuses on the safety, weight, and stiffness of the component.
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Clutches for Heavy Commercial Vehicles
Fous, Michal ; Míša, Jiří (referee) ; Fojtášek, Jan (advisor)
This work summarizes the issue of clutches and retarders designed for commercial vehicles. It deals with the principle of function and construction of clutches for manual and automatic transmissions. It also outlines the issue of materials for clutch linings and the suitability of their use. Finally, retarders are analyzed, focusing mainly on oil, water and electrical types.
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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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Adaptive control of magnetorheological dampers
Míša, Jiří ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
The topic of this master´s thesis is the design of adaptive damping algorithm for the prototype magnetorheological dampers, which are used for Formula Student vehicle. The prime output is the development and optimization of the control algorithm which included usage of the MBS software and real data from race track. Temperature compensation to supress the effect of dynamic viscosity of magnetorheological fluid due to the increase in operating temperature and testing of the vertical dynamic of the car on 4 - post test rig was realized as well. The main goal was to obtain better control of the car in transient situations and increase usability of tires via changes in damping based on actual conditions and status of the vehicle.
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Measurement of vehicle torsion stabilizer characteristics
Haratek, Marek ; Míša, Jiří (referee) ; Porteš, Petr (advisor)
This diploma thesis deals with the measurement of the torsion stabilizer characteristics. The beginning of the thesis explains the function of a torsion stabilizer in a vehicle and introduces various technical options of stabilization. Next part is focused on computational simulation of representative stabilizers. Next parts are devoted to proposition of measuring device for torsion stabilizers in the laboratory and execution of the experiment. In the final part multibody model is created to demonstrate achieved results.
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