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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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System of adaptive rear axle steering
Dostál, Marek ; Fojtášek, Jan (referee) ; Míša, Jiří (advisor)
The topic of this master’s thesis is the design and optimization of adaptive rear axle steering algorithm used on a Formula Student race car. The main goal of the thesis is to analyse a vehicle transient state to develop a vehicle dynamics control system by changing rear wheel slip angles. A steering function was built, which was then optimised by MBS simulations. Simulations were validated by measurement with Correvit optical sensor. Additionally, the steering function algorithm was improved by rear axle compliance compensation. Compliance in lateral direction was measured on the real car. Finally, the whole mechanism has been assembled and tested.
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Formula Student Rear Wheel Carrier Design
Míša, Jiří ; Janoušek, Michal (referee) ; Ramík, Pavel (advisor)
This bachelor thesis is about construction rear upright of Formula Student car using topology optimization. The goal is to achieve higher stiffness with a minimum weight difference compared to last model. Part of this thesis is also a design of the upper flange for changing the wheel camber.
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Study of vehicle torque vectoring
Hlaváč, Pavel ; Fojtášek, Jan (referee) ; Míša, Jiří (advisor)
This bachelor thesis deals with torque vectoring. This topic has become interesting in recent years, as there is a rapid development of electromobility. Torque vectoring system can be integrated into electric vehicles with ease because there can be two motors on one axle. In this thesis, various types of drives and drivetrains are described, differentials are also covered in detail. Vehicle dynamics is also described. After the vehicle dynamics, the very benefit of torque vectoring is discussed. Finally, sensors and programs that could be used to design and simulate the system are briefly mentioned.
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Data buses in the automotive industry
Plíšek, Marek ; Míša, Jiří (referee) ; Zháňal, Lubor (advisor)
The topic of the bachelor thesis is data buses in cars. The aim of the work is to describe data buses and compare their key properties and functional parameters. Sources for bus comparison are drawn from domestic and foreign sources. The work brings a complete comparison of all commonly used data buses: CAN, LIN, FlexRay, MOST, Ethernet. The output of the analysis is a clear table of properties and parameters of buses with a description of their advantages and disadvantages. The work is supplemented by a reflection on the future development of communication systems in cars.
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Longitudinal Dynamics Control for Vehicle Platooning
Straka, Václav ; Míša, Jiří (referee) ; Fojtášek, Jan (advisor)
The aim of this thesis is to design a test model for testing a longitudinal dynamics control algorithm for driving in an automated convoy. The thesis will include a brief research section, a summary of currently used solutions for automated convoy testing, the design of algorithms for maintaining spacing by sensor-based dynamics control, and finally the construction of a virtual automated convoy with a single vehicle longitudinal dynamics control algorithm.
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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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