National Repository of Grey Literature 115 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Analysis of energy and performance parameters of tractor sets for tillage
Masnica, Daniel ; Porteš, Petr (referee) ; Bauer, František (advisor)
This diploma thesis analyzes the influences of individual components and settings on the performance and energy parameters of tractor sets. The theoretical part of the thesis focuses on tractor construction and describes some electronic systems used in modern tractors. It also describes the methodology of field measurements, measuring techniques, and machinery used for the measurements. The practical part of the thesis deals with field measurements of a tractor set with a combined cultivator, a plow, and traction tests of the tractor. From the measured data, various performance and energy parameters are calculated. The results are analyzed, and a discussion is provided.
Measurement of vehicle suspension bushing characteristics
Kopecký, Petr ; Zháňal, Lubor (referee) ; Porteš, Petr (advisor)
This master’s thesis deals with the measurement of static characteristics of wheel suspension bushings. It includes a structural design of the test device and drawings according to which the device was manufactured. The device has several variations for different stresses and is applicable with possible modifications to various bushings including the ones that do not have common axes. The measurement procedure, the results of the measurements of the static characteristics and their analysis and comparison with the finite element method calculations are also given. The measured characteristics were then added to the model of the axle for multibody simulations.
Franc, Lukáš ; Porteš, Petr (referee) ; Zháňal, Lubor (advisor)
This master thesis deals with verifying whether it is possible to determine the external speed characteristic of the engine using sensors in mobile phone. For this verification were made driving tests, during which the driving data were measured with mobile phone. These data were processed in the calculation part in MATLAB. Results were compared with power measurement on chassis dynamometer and with two alternative methods of power measurement.
Autonomous driving concept for Formula Student
Pavel, Matěj ; Štětina, Josef (referee) ; Porteš, Petr (advisor)
The goal of the paper is to propose a new iteration of TU Brno Racing’s autonomous driving system. It first concerns itself with a general overview of autonomous vehicles and the rules of the Formula Student competition and an analysis of the current solution, with discussion of its flaws. Next, a solution is proposed to one of those flaws – vehicle localization utilizing an Extended Kalman Filter (EKF) for sensor fusion. Necessary filtering and transformations of the data are discussed. Finally, the paper contains a choice of sensors potentially useful for further increases in accuracy of the localization system.
Construction of an Experimental Vehicle Chassis Using the Lego System
Kratochvíl, Jan ; Porteš, Petr (referee) ; Svída, David (advisor)
This bachelor's thesis deals with the development of an experimental vehicle chassis using LEGO system parts with the aim of creating a platform for development of autonomous driving. To achieve this goal, the experimental vehicle chassis must meet the parameters and characteristics of real automobiles. Therefore, research was conducted to investigate the parameters and examine requirements for steering geometry, wheel bearings, arm structures, hub structures, and other key components of the chassis, as well as the approaches used to address these parameters in official LEGO models. Based on these findings, an initial model was assembled using only LEGO system parts, on which these parameters were evaluated. Limitations of the LEGO system were identified in wheel bearings, arms, and hubs. Subsequently, design modifications were made to these parts, including the use of rolling ball bearings and the production of arms and hubs using 3D printing technology. The second model, constructed using these modified parts, already met the mentioned requirements and approached the chassis of real automobiles.
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.
Mathematical description of vehicle motion trajectory
Lorenczyk, Jiří ; Popela, Pavel (referee) ; Porteš, Petr (advisor)
The goal of this thesis is to nd types of curves which would allow for the construction of a path that could be traversed by a vehicle. It seems that a minimal constraint for such a path is the continuity of curve's curvature. This leads to a closer look at the three types of curves: Clothoids, which are able to smoothly connect straights with arcs of a constant curvature, interpolation quintic splines, which are C2 smooth in the interpolation nodes and -splines, these belong to the family of quintic polynomial curves too, however, they are characterised by the vector of parameters which modies the shape of the curve. The thesis is accompanied by an application allowing for manual construction of the path composed of spline curves.
Thermomechanical tire model
Vaníček, Jan ; Štětina, Josef (referee) ; Porteš, Petr (advisor)
This diploma thesis is about thermomechanics of passenger car tires. The research part dealing with existing tire models is followed by the practical part. The practical part is based on the designs of thermomechanical models. The first model determines a dependence of temperature on the air pressure inside a tire when a temperature changes. The second thermomechanical model captures all the heat fluxes which affect a tire while a vehicle is in motion. The third thermomechanical model calculates temperatures of parts of the tire during driving tests. All models are programmed in MATLAB.
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.
Virtual testing of autonomous vehicles
Matušková, Lucie ; Fojtášek, Jan (referee) ; Porteš, Petr (advisor)
This bachelor thesis deals with virtual testing of autonomous vehicles. The theoretical part describes an autonomous vehicle, the issue of testing autonomous vehicles. Furthermore, the work is focused on the description of ADAMS Car software and Virtual test drive. The virtual test drive is described for the most part, because it also contains a practical part of the work, which is working with the software.

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