National Repository of Grey Literature 44 records found  previous11 - 20nextend  jump to record: Search took 0.00 seconds. 
Processing of selected terminology at road accident analysis
Tokař, Stanislav ; Šachl, Jindřich (referee) ; Kropáč, František (referee) ; Drahotský, Ivo (referee) ; Vémola, Aleš (advisor)
The thesis deals with the terminology used in forensic engineering practice at the analysis of road accidents. It means defining the concepts describing specific expert research in the area of car accident analysis such as the option of evasive action and the possibility of preventing collision. Further on, the thesis focuses on the terminology used in areas closely related to analysis of road accidents namely dealing with cases of criminal activities in the field of motor vehicle insurance from an expert point of view. In this area, terms such as extent of the damage, character of the damage, correspondence of the damage and the technical acceptability of accident, are solved. These terms constitute a formal process that can serve as a tool for experts when dealing with such cases. In addition, selected terms from the technical-legal area, which the experts often encounter, are processed here. At the same time, there is no uniform approach to their evaluation from a technical perspective. Here, there is a possibility of setting the limits of a sudden change of speed and a sudden change of direction.
STIFFNESS ANALYSIS OF FRONT PART OF THE VEHICLE
Coufal, Tomáš ; Kovanda, Jan (referee) ; Kohút,, Pavol (referee) ; Vémola, Aleš (advisor)
The thesis deals with the front part stiffness of modern vehicles, especially for the use in the field of forensic engineering in the traffic accident analysis. During the traffic accident analysis, an inquiry into the collision between vehicles is carried out which is an integral part of determining the energy loss of the vehicle at the impact, or more precisely the deformation energy expressed in the form of Energy Equivalent Speed (EES). In case of known stiffness of given part of the vehicle and based on the depth of deformation, it is possible to calculate the deformation energy, or more precisely EES corresponding with given damage of the vehicle. In the field of forensic engineering, the values of stiffness of individual vehicle components are not known and therefore, alternative methods are used to calculate the EES, they are outlined in the research part of this dissertation. However, the current methods of EES determination have some limitations when it comes to usability, and therefore, new EES calculation for the front part of the vehicle was designed in the research. It was based on the real crash test results using real stiffness characteristics of the front part of a vehicle. The front part of the vehicle is divided into individual areas and each of these parts is characterised by its own stiffness coefficient. The designed EES calculation can thus be also used for collisions with partial overlapping, taking into account the real stiffness of the damaged part of the vehicle, which was not possible with existing methods. In the research part of this dissertation, a computer programme to calculate deformation energy and EES was processed. It works with individual stiffness characteristics in given areas where the input data are entered by the user and include the depth of permanent front part deformation in individual areas, vehicle weight, the direction of an impact force and the friction coefficient on the contact surface. Considering the fact that the vehicle stiffness is also one of the control parameters at solving collisions in the PC-Crash simulation programme, which is used in forensic engineering practice for the analysis of a collision process, a supplementary computer programme was designed. Based on the above-mentioned input data, the supplementary programme can further calculate data for collision solving in the simulation programme, namely stiffness, restitution coefficient and the vehicle damage stated in the output report of the simulation programme. Based on these data, the expert thus has the opportunity to solve the collision of two vehicles in the simulation programme with as much preciseness as if it was a real collision.
Problems of the Expert Analysis of the Vehicle Movement and Braking Action in General Spatial Curve at Speed Higher than 50 km/h
Panáček, Vladimír ; Šachl, Jindřich (referee) ; Drahotský, Ivo (referee) ; Vémola, Aleš (advisor)
The present apparatus for the technical analysis of road accidents has no well-integrated information, recommendations or procedures of how to solve comprehensively the analysis of road accidents involving vehicles equipped with stabilization system of driving dynamics. The problem in the investigation of a vehicle movement in a curve is the ignorance of the contributions of vehicle dynamics intervention of the electronic stability system. Although some of the simulation software used in the analysis of road accidents makes it possible to take into account the modelled vehicle movement impacted by a stabilization system in the examined process, but the experts do not know what parameters should be entered in the numerical models of stabilization system in a computer programme. Therefore, the thesis investigates the issue of the expert analysis of vehicle riding and braking in a general spatial curve at speeds exceeding 50 kph with simultaneous examining the impact of electronic stability system chassis on vehicle driving dynamics. The thesis first deals with the solutions based on classical analytical methods, then dwells on experimental measurements in real conditions on testing grounds and, finally, addresses the use of computer simulation software in expert practice. Nevertheless, it is important to realize that no computer simulation software can be an absolutely unambiguous solver, and it is not enough to generate a computer simulation, but so obtained results should be evaluated and justified technically. Road accident analyst needs to know the impact of vehicle electronic stability control systems on vehicle movement. The thesis investigated the mutual relationship between the vehicle speed limit in a curve specified by analytical calculation and the vehicle speed in a curve experimentally detected by measuring the parameters of driving dynamics of a vehicle equipped with electronic stability system. The impact of selected electronic stability control systems of the chassis on the vehicle movement in the investigated processes in the curve was detected and quantified by driving experiments. Finally, the input values of significant quantities of computational models of the ESP simulation programs were found consistent with the results of experimental measurements in defined curves for the vehicles equipped with electronic stability systems. The results of the thesis can be used both in the expert and in the teaching activities.
Detection of Braking Tracks using Laser-Induced Breakdown Spectroscopy (LIBS) and Laser-Induced Fluorescence Spectroscopy (LIBS + LIFS)
Prochazka, David ; Vémola, Aleš (referee) ; Pína,, Ladislav (referee) ; Kaiser, Jozef (advisor)
The aim of this work is to investigate the potential of Laser-Induced Breakdown Spectroscopy (LIBS) for identification of visually unrecognizable braking tracks. Identification of these tracks is based on different chemical composition of tire tread in comparison to road surface. The investigation was divided in several sequential steps – selection of suitable chemical element and its spectral line for break tracks identification; determination of the limits of detection and threshold intensity respectively for the selected chemical element; verification of LIBS ability to detect braking tracks on a real braking track. This testing braking track was prepared by exactly defined and described conditions. The detection was performed in two ways – laboratory analysis of tire treads particles collected via adhesive tape and in situ analysis via mobile apparatus. Results of both measurements showed that LIBS is able to detect visually unrecognizable braking tracks. Concepts of the devices capable of routine braking tracks identification for both possibilities were introduced.
Management of risk analysis in rally racing
Pilná, Petra ; Karel, Pressler (referee) ; Vémola, Aleš (advisor)
This diploma thesis deals with the determination of risk in rally races and suggests methods to reduce them. The theoretical part is devoted to the legal definition of rally races and terms of rallye, risk and in addition there will be described and explained the methods used in the risk analysis. It also includes part devoted to the history of rally racing in the world and in Czech Republic. The analytical part includes time plan of rally race. Risk analysis methods mentioned in the theoretical part, are used in the analytical part. The aim is to propose measures that are actually able to reduce the risk in itself, or its impacts.
The Issue of the Competence of Drivers of Motor Vehicles to Drive on the Roads of the Czech Republic
Chodurová, Zuzana ; Kudláček, Jaroslav (referee) ; Vémola, Aleš (advisor)
The theme of this master’s thesis is The Issue of the Competence of Drivers of Motor Vehicles to Drive on the Roads of the Czech Republic. It includes an analysis of the current state legislative requirements for obtaining professional qualifications of drivers, health qualification and improves their professional competence for the purposes of professional competence and analysis of selected specific road safety. In light of the findings was performed the analysis of traffic accidents in the Czech Republic. Based on the analysis of traffic accidents was the practical part of a questionnaire survey and proposals aimed at improving safety on the roads.
Analysis of a Vehicle Saleability
Hasmanová, Sabina Bohdana ; Leichmann, Marek (referee) ; Vémola, Aleš (advisor)
The object of this thesis is to focus on the major influences of vehicle saleability in Czech Republic in terms of the most important criteria, such as price, fuel consumption, colour etc. Part of the work will be arranged questionnaires. The survey indicates desirability of cars back for the last five years. This creates sales trend with a hint of future development.
Analysis of Vehicle Damage after a Minor Car Accident
Psica, Lukáš ; Rábek, Vlastimil (referee) ; Vémola, Aleš (advisor)
The thesis deals with the analysis of small accidents. Its attention is focused on the estimated amount of money needed to repair a vehicle immediately after the accident and later on the real amount that is actually necessary to fix the vehicle. In practice, it often happens that an accident may seem minor at first glance. Only after dismantling of a damaged vehicle and its parts it is found that the damage is much greater than initially predicted. Attention is focused as well on constantly growing insurance frauds. Nowadays, there is no literature concerning this issue.
Motor Vehicle Block Exemption Regulation and the Car Market in Brno
Hemala, Michal ; Leichmann, Marek (referee) ; Vémola, Aleš (advisor)
This thesis summarizes main reasons for using motor vehicle block exemption regulation. It studies the position of independent car repair shops and their access to technical documentation. It provides a summary of the main reguirements for authorized dealers and car repair shops’ equipment. A list of authorized dealers for each brand in Brno follows. In conclusion, there are two projects for a car repair shop and its business forecast.
The Issue of the Competence of Drivers of Motor Vehicles to Drive on the Roads of the Czech Republic
Chodurová, Zuzana ; Kudláček, Jaroslav (referee) ; Vémola, Aleš (advisor)
The theme of this master’s thesis is The Issue of the Competence of Drivers of Motor Vehicles to Drive on the Roads of the Czech Republic. It includes an analysis of the current state legislative requirements for obtaining professional qualifications of drivers in the Czech Republic and in neighboring states and comparison of selected specifics of the issue. An analysis was made of traffic accidents in the Czech Republic and comparison of basic indicators of accidents with neighboring states. Based on the analysis of the current state, then the practical part includes a questionnaire survey and suggestion of measures for improving road safety.

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