National Repository of Grey Literature 82 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Mathematical models of tires
Straka, Tomáš ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
This master‘s thesis describes problematics of mathematical models of tires for computer simulations. The goal of this thesis is to depict currently used models of tires and to compare them. Thesis describes brush type models, Fiala, Magic Formula (Pacejka), FTire, UA-Gim, 521 and DELFT. Those models are compared to each other by simulations carried out in software MSC ADAMS Car. The results are shown in figures with commentary and evaluation. This thesis serves as introduction to problematics of currently used mathematical models of tire in computer simulations.
Stabilization systems of motorcycles
Jeřela, Martin ; Janoušek, Michal (referee) ; Zháňal, Lubor (advisor)
The research work is focused on mechanical and electronic stability systems. Their brief development and detailed description of the functions that occur today in single-track mo-tor vehicles
Photogrammetric localization of motorcycle rider
Lečbych, Jiří ; Zháňal, Lubor (referee) ; Fojtášek, Jan (advisor)
This Master’s thesis deals with designing a measuring device that would record driver’s movements during dynamic riding states known as localization, and based on the recorded data creating a simulation in multi-body software. The first part reviews the current state of knowledge in the field of photogrammetry, sensors, and motorcycles’ characteristics. Moreover, the second part focuses on constructing the measuring device, practical aspects of data collection, processing, and evaluation in multi-body software.
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.
Construction of tires
Dlouhý, Filip ; Fojtášek, Jan (referee) ; Zháňal, Lubor (advisor)
The intention of this bachelor’s thesis is a general summary of the function, construction, history, and comparison of tires of individual vehicle categories. The comparison focuses on the functions and uses of tires. It includes an outline of modern trends and future development of tires.
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.
Design of conventional motorcycle swingarm made from aluminum alloy
Adlof, Michal ; Tobiáš, Martin (referee) ; Zháňal, Lubor (advisor)
This bachelor thesis deals with the proposal of the swingarm from aluminium alloys. The theoretical part is devoted to a closer description of the swingarm. Here, the older ways of wheel deposition are described, followed by a comparison of the four basic variations of the swinging forks. The practical part of the thesis is then focused on the design overhaul of the steel swingarm. In the next part, the calculations of forces and stress analysis are presented. Subsequently, the original steel and redesigned aluminium swingarm are compared. And finally, the complete drawing documentation needed for the production can be found in the annex.
Identification of tire model parameters
Olišar, Petr ; Zháňal, Lubor (referee) ; Porteš, Petr (advisor)
The main goal of this thesis is to obtain lateral parameters of the Magic Formula tire model of a tire commonly used in Formula Student competition. Both the author and the supervisor of the thesis know the tire name and its specification, but the research company that did the tire testing and provided me with the date prohibits sharing this of data publicly, so the tire designation is not mentioned in this thesis. The first chapter covers main theoretical facts related to a tire, briefly describes some of the tire models and shows possibilities how to determine tire characteristics that are used in a tire model. The thesis describes how to process raw tire data measured during a laboratory experiment using scripts created in Matlab software. The inputs variables are slip angle, lateral force, normal force and inclination angle. Raw data are splitted into parts, main coefficients of the Magic formula model (B, C, D, E, Sh, Sv) are calculated and subsequently the lateral parameters are obtained using least square method to fit parameters into the measured data. The works gives two main outcomes. The first output is a set of Matlab scripts that can be used to determine lateral parameters of any tire that has the same input data format as presented. A TIR file of the Formula Student tire in case of lateral slip is the second result of the work. This can be used for vehicle dynamics simulation of Formula Student racing car. The thesis also offers a comparison between parameters, which I calculated, and those gained thanks to Optimum Tire software by Calspan research company. Additionally the work shows the effect of load and inclination angle on lateral force.
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.
Driver Steering Model for Simulation Algorithms
Tmejová, Tereza ; Zháňal, Lubor (referee) ; Hejtmánek, Petr (advisor)
This diploma thesis deals with the creation of a computation driver model. In the first part, there is an overview on driver models for longitudinal and lateral control. Next, driving maneuvres that could be selected for testing of driver model are described. In the practical part, there is created a computational driver model, whose task is to follow required path. The resulting model is tested on three driving maneuvers - steady turning, moose test and slalom. Finally, this model is tested on the passage of a real track. For all these tracks, a comparison is made and the success of the model is evaluated.

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