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Analysis of Driving a Passenger Vehicle with a Trailer
Šujan, Tomáš ; Kropáč, František (referee) ; Vémola, Aleš (advisor)
The subject of this thesis is the analysis of the negative effects associated with the operation of a trailer for a personal vehicle with respect to the design speed, technical checks and analysis related legislation. Its work is drawn from the measurement, cooperation with leading Czech production plant trailers Vezeko s.r.o., an organization engaged in the implementation of engineering controls DEKRA Automobil a.s. and available literature, including electronic resources. Results of the work end with proposals for specific measures to minimize the identified adverse effects.
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The Lighting Equipment Used in Modern Vehicles and the Measurement of the Range of Visibility of the Rear Lights
Belák, Michal ; Kropáč, František (referee) ; Vémola, Aleš (advisor)
This work is about lighting equipment of modern vehicles, its historical development, present condition and possibilities of its further progress and measuring of the range of visibility of the rear lights. First part is aimed at lighting equipment used in modern vehicles as a whole. It describes sources of light, their principle, construction, advantages and disadvantages. Next it deals with searchlights and other lighting devices, their gradual development, construction and modern solutions which are used in them, and also their future development. Second part of the work is aimed at characterization of ways of measuring the range of visibility used in practice, their possible application to measuring of the range of visibility of the rear lights and on proposal of presentive methodics for this measurement. Realization and interpretation of practical measurement by this methodics is included.
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Braking marks creation analysis in dependence of vehicle deceleration
Svoboda, Lukáš ; Panáček, Vladimír (referee) ; Vémola, Aleš (advisor)
The work is divided into two parts – theoretical and practical. The first, theoretical part is focused on introduction with the problematics, describing the concept of translation motion and brake physics, defining terms adhesion and friction, skid, driving resistances, calculation formulas etc. After the mechanics chapter follows the chapter about tire and its composition and properties, and a brake system chapter, describing Anti-lock brake system (ABS) and some other important brake-support systems. Second part of this thesis is focused on practical side, which contains acceleration measuring and skid marks creation, followed by evaluation of measured data in form of calculations and graphs.
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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.
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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.
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The Lighting Equipment Used in Modern Vehicles and the Measurement of the Range of Visibility of the Main Headlights
Martínek, Michal ; Kropáč, František (referee) ; Vémola, Aleš (advisor)
This magister’s thesis is about modern lighting of vehicles, the visual range and afterglow in poor visibility. The first part of the thesis provides a detailed analysis of the current situation and problems, including a comprehensive description of the sources of light radiation, lamps, structures, and describe the systems used in modern lighting technology of vehicles. In the second part of the thesis there are the scientific methods to determine the issue of visual range and afterglow of the headlights. The second part is about the application of acquired techniques to detect an afterglow and the visual range of vehicles with modern headlights with a light source with xenon lamp, compared with a vehicle with a halogen lamp and a vehicle with an older halogen headlight.
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Analysis of Non-Standard Braking Intervention into the Brake System
Kortán, Daniel ; Bradáč, Albert (referee) ; Vémola, Aleš (advisor)
This master’s thesis focused on the issue of the possible conversion of liquid brake systems, in the form of replacement of wheel brakes. The first part focused on the function and description of the construction of different types of brakes. The second part is focused on description the types of brake system testing and the regulations regarding brake systems. The last part focused on the measurement of both vehicles and comparison of the results with the calculations.
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Measuring and Comparing Driving Parameters of Vehicles in Various Driving Regimes
Cholasta, Lukáš ; Krejčíř, Pavel (referee) ; Vémola, Aleš (advisor)
n this work is processed a summary of selected driving parameters of vehicles, methods of measuring and use in the automotive industry or related branch especially. This work is focused on driving tests of vehicles and measurement driving parameters of vehicles. As part of this work was done measurements parameters of vehicles driving in various driving regimes and subsequent analyse of obtained data. The result of this work is determination methodology division driving regimes and evaluation the impact of driving regimes on to ride a car in a directional curve.
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Technical Interpretation of Chosen Terms from Traffic Regulations
Krychtálek, Zdeněk ; Radimský, Michal (referee) ; Vémola, Aleš (advisor)
The aim of this thesis is to analyze the current situation and prepare a technical interpretation of selected basic concepts of traffic rules to increase legal certainty and the road needs to bring to engineering practice. These are the concepts of safe distance, perspective, suddenly and unsuddenly. The diploma work is dealt with on a technical interpretation of selected terms of traffic rules, which are important for safety.
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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.
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