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Impact of the Instantaneous Weight of Vehicles on their Stopping Distance
Motl, Jakub ; Ptáček,, Petr (referee) ; Vémola, Aleš (advisor)
This diploma thesis is engaged in analysis of braking process of vehicles, especially heavy utility vehicles, with regard to their instantaneous weight. This thesis features survey and division of braking systems and function of brakes including schemes and descriptions. Also there is introduce of some systems improving vehicle properties. Furthermore this work puts mind to possibilities of examination of brakes, measurement of braking distance and braking retardation namely in brake test rooms or by outdoor driving tests including descriptions of particular methods and equipment. There is also mention about legislative requirements for braking distance and braking retardation. The conclusion of this thesis compares numerically predicted braking distance and real braking distance measured for factual vehicle during outdoor driving test
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Influence of the different light sources of the vehicle headlights on the perception of an obstacle by the driver of the vehicle
Sklenář, Michal ; Bradáč, Albert (referee) ; Motl, Jakub (advisor)
This thesis focuses on examining the influence of various light sources (halogen, xenon, LED) of vehicle headlights (Škoda Octavia III. generation) on the perception of pedestrians by the driver of the vehicle. The theoretical part contains the concepts essential for a general understanding of the main topic of this thesis. The aim of the thesis is to present how the brightness and contrast between the pedestrian and his surroundings changes when illuminated by one of these light sources due to the increasing distance between the pedestrian and the vehicle and the different type of pedestrian clothing. The results of the measured experiment are presented using charts, photo documentation and brightness maps. These are then compared with the results obtained by measuring the distance of pedestrian perception by individual probands. The conclusions applicable to forensic engineering practice are drawn from the compared values.
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Checking of Vehicle Identifiers
Motúz, Ondřej ; Panáček, Vladimír (referee) ; Motl, Jakub (advisor)
Diploma thesis is focused on identifiers of vehicles and their parts. The thesis gives an overview about available identifiers situated on the vecihles. Further more the thesis deal with potentional forgery and altering of identifiers and as a next shows potentional ways how to detect a manipulation with them. Practipal part of thesis includes a proposal of methodology for checking vehicles based on identifiers. There was also created a cathalogue of the Skoda vehicles. It gives an overview of identifiers for selected vehicles of the brand Skoda.
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Comparison of Light Parameters of Different Light Sources of Vehicles' Headlamps
Suchomel, Filip ; Motl, Jakub (referee) ; Bradáč, Albert (advisor)
This thesis is focused on comparison of parameters of light sources (halogen, xenon, LED) installed in Skoda Octavia 3rd generation. The opening part solves analysis of the current state of lighting technology and its impact on traffic safety. The next part is focused on general parameters of light, construction of light sources, optical systems and adaptation of the human eye to various light conditions, especially contrast. The practical part is focused on comparing the contrast values of individual light sources in relation to the dark and lightly dressed pedestrian in the area without artificial lighting.
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Design of thermal system for accurate temperature stabilization using Peltier thermoelectric modules
Motl, Jakub ; Trčka, Tomáš (referee) ; Macků, Robert (advisor)
This master’s thesis describes design procedure of a heat-regulating system to stabilize its temperature using a Peltier module. The implementation uses eight-bit microcontroller ATmega16 made by company ATMEL for the local and remote control system. The temperature sensors communicate with the microcontroller by serial SPI interface. To display user data, it has a DEM16217SYH type character LCD display with HD44780 control circuit. To collect data from the cooling areas of Peltier module, accurate ADT7320 temperature sensors are used, made by company Analog Devices. The Control of the Peltier module happens in two points of the electrode system and a bistable hysteresis software regulator is used. The first part summarizes the theory, which concerns with the design. Next part concerned with issues of the Peltier module, overview of temperature sensors, description of the microcontroller, the display unit and the used regulator. Last part describes the hardware and software implementation.
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Professional Drivers´Accident Characteristic
Lukáčová, Zuzana ; Motl, Jakub (referee) ; Schmeidler, Karel (advisor)
The diploma thesis discusses characteristics of accidents of professional lorry drivers in relations to their personalities, work, health and mental conditions. The thesis is composed of three sections: theoretical, analytical, and a section on recommendations. Theoretical section introduces theory of the given line of work and presents both outer and inner influences in this respect. Theoretical section is followed by the analytical section, with both quantitative and qualitative research discussing the most common accidents of professional lorry drivers. Based on the first two sections of the thesis, innovative solutions have been offered in the last section, with the aim of contributing to lowering the number of traffic accidents of drivers maneuvering vehicles over 7.5 tons. In order to gather necessary information, analysis of literature has been conducted, with statistical measures introduced in the thesis and structured interviews and polls having been done also. This has provided results towards arguing the knowledge on the given issue so far and has additionally allowed for innovative solutions leading to elimination of traffic accidents caused by professional lorry drivers.
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Creating communication between Power Panel
Motl, Jakub ; Malounek, Petr (referee) ; Chomát, Luděk (advisor)
Theoretic part of my bachelor's thesis deal with possibilities in communication between Power Panels, made by B&R company. Describes possible communication between more PLCs, visual facilities and list of B&R company products. Furthermore some technical literature, RS232 interface, Ethernet, Ethernet PowerLink, CAN, PVI manager. The Practical part describes how to make a communication using INA 2000 protocol dedicated RS232 interface, Ethernet net with star topology. Furthermore program solution with regard to snake game visualization draft.
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Analysis of driver reaction to sudden stimulus
Brezová, Gabriela ; Motl, Jakub (referee) ; Mikulec, Roman (advisor)
The diploma thesis deal with what ways drivers react to an unexpected stimulus. In the theoretical part, the analysis of the current state, reaction time, methods of reaction of the driver, stimuli from the environment and finally is being analyzed, the vehicle and its assistance systems. The analytical part of the diploma thesis was performed by driving tests, where it was found that the way the driver reacts from the distance to which they are obstructed and the speed of the vehicle. For that reason, a TTC dependency analysis was performed. It was found that drivers at low TTC values chose an obstacle in which they brake the need to move their foot from the accelerator pedal to the brake pedal and they have to brake sharply. At medium TTC values, drivers brake most often. In the case of a combination of conductors, they chose braking with avoiding at lower TTC values and avoiding with braking at medium TTC values. There was also a dependence of the method of reaction on driving experience. Inexperienced drivers rather choose braking, experienced drivers use combinations.
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Possibilities of simulation modeling of traffic accidents with reduced visibility
Rozsíval, Jan ; Motl, Jakub (referee) ; Bradáč, Albert (advisor)
The diploma thesis deals with the possibilities of simulation modeling with reduced visibility in the Virtual CRASH program, which as the only available programs allows work both with the help of mathematical models to simulate vehicle movement and change parameters to simulate reduced visibility, lighting, etc. The theoretical part contains a description of photometric quantities, deals with the human eye and its ability to see under reduced visibility, a description of the luxmeter meter and luminance analyzers. Here are four main reasons for reduced visibility and their description. It contains a sample of the most used programs used to deal with traffic accidents. The four types of headlights most commonly used in today's vehicles are listed and described. In the experimental part, two measurements were performed. The first measurement to obtain input values to obtain a black and white texture determining the shape of the light rays emanating from the vehicle headlights. The second experiment to obtain the contrasts of the white box, black box and pedestrian for subsequent comparison with the output of the Virtual CRASH program.
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Possibilities of presentation and interpretation of cultural heritage in digital environment
Motl, Jakub ; Pýcha, Čeněk (advisor) ; Wančová, Nina (referee)
This bachelor's thesis deals with the transformation of the concept of cultural heritage in the digital environment, both on the side of the presenting institution and the visitor and mapping the experience of learning about cultural heritage in the digital environment. In the theoretical part, the basic terms related to the focus of the bachelor's thesis are defined and they introduce the reader to its issues. It also presents legislation related to the presentation and interpretation of cultural heritage and four selected projects presenting cultural heritage objects in a digital environment. These are compared with each other and evaluated on the basis of features, thanks to which the most suitable platform is subsequently recommended. This section also presents significant theoretical works of the authors related to the topic of the work. The practical part consists of a case study of the Polabské Museum. The study evaluates the current state of the museum, its collections and the process of digitization and digital presentation of the institution. The research is based on qualitative semi-structured interviews with museum staff and potential visitors of the "digital museum". The obtained data is processed using the SWOT analysis method, which identifies the strengths and weaknesses of the...
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