This diploma thesis focuses on incorrect inflation and incorrect use of tires in extreme situations. In the first part, a search of previously created works is reported. This is followed by the elaboration of the basic theory, which describes the driving dynamics of the vehicle, braking and construction, marking, wear and inflation of tires. The next part is the measurement and evaluation of the effect of incorrect inflation and use of tires. Braking deceleration and evasive maneuvers were performed as tests. The third part is an evaluation and summary of the situation.

This document focuses on the influence of vehicle geometry setting on the tire tread wear. A series of tests using trucks with varied geometry settings has been carried out. The data of tire tread wear was collected during a five month period. An analysis was then conducted and a proposition of adjusting the methodology for further usage has been made.

This work solves the effect of incorrect tire inflation on the warming of their parts while driving a personal car. A series of tests were carried out for different tire pressure values and during the tests the temperature data of tires was collected using a thermocamera. An analysis of these data was also carried out and a proposal for modification of the methodology for further measurements was made.

The thesis deals with the possibilities of identifying the relevant tire traces at the place of a traffic accident based on their physical characteristics. Braking traces on the road are one of the most important objective elements for accident analysis, their easy and accurate detection is very important for accurate accident assessment. With the increasing technical equipment of vehicles, especially with the introduction of newer generations of braking assistance systems, traces left by the tires become almost invisible to the human eye. It is therefore highly desirable that their detection should be not only as accurate as possible but also as easy and fast as possible, not only for forensic experts, but especially for members of the traffic police departments. In line with the development and introduction of new safety and assistance systems for vehicles should also be the development of means and methods of providing the basis for technical analysis of traffic accidents. Reality shows that the procedures, even if still functional, are practically identical for several decades, are dependent on the subjective capabilities of the documenting person. An essential element of the work, compared to the previously described measurement procedures, is the use of modern methods and devices at the highest known level of knowledge. The aim is to find and verify a simple, accurate, subjectively least influenced detecting method for tire traces on the road. A series of measurements confirmed the possibility of using the thermal camera at the technical level usually available at the place of the accident, under limited atmospheric and time conditions. In addition, laser-induced plasma spectroscopy and rLIBS were used. This method of detecting spotless tire treads can be marked as a minimally feasible documentary and at the same time as fast enough, based on the measurements made and the intended removal of defects of the instrument in the development phase of the prototype.

The problems with microplastics, small plastic particles contaminating the environment, is a subject of heated discussions today. It has been recognized that the microplastics are not inert, but instead they have an impact on all enviromnental compartments. There are studies describing the negative effects of microplastics, for example on fauna and flora or on human health, but the effects on soil quality have not been sufficiently described. The aim of this thesis was to assess the short and medium term effects that microplastics could have on the soil. In this work, a series of experiments were performed to elucidate the fate of microplastics in the soil. Changes in soil organic matter thermal properties, soil respiration, amount of water and soil aggregation depending on the incubation time were monitored. Three types of agricultural land (chernozem, cambisol and phaeozem), which were contaminated with different concentrations od PET and tyre rubber, were tested. The results confirmed the specific effects of microplastics on soil properties, which were observed in non-incubated samples (i.e. at the time of incubation 0 months), microplastics did not behave inertly in the soil and affected, for example, soil properties, texture and respiration.

Práce se zabývá návrhem jednoúčelového plně automatického zařízení pro automobilový průmysl, které dávkuje silikonovou směs do pouzdra snímače. V první části práce je řešen návrh mechanické části zařízení, zejména manipulátoru pro polohování dávkovací hlavy. K pohonu manipulátoru je využito pneumatických prvků, které jsou řízeny elektrickými signály. Druhá část práce se zabývá řízením stroje, které je realizováno pomocí PLC systému. Obsluha může ovládat zařízení nebo sledovat aktuální stav na dotykovém panelu. V závěru práce je prezentováno skutečné provedení zařízení a propojení s výrobní linkou.

The aim of this thesis is a construction concept of tyre rolling resistance measuring device. The first part deals with the rolling resistance. It describes its causes, its influential factors and it also includes rolling resistance identification methods. The second part deals with construction design of the rolling resistance measuring device itself. It contains stress analysis, and fatigue analyses as well. It includes selection of transducers used for tyre rolling resistance measuring and also measurement error analyses. The last part focuses on estimated financial requirements connected with producing and assembling the designed measuring device.

This diploma thesis deals with methods of used tire management, proposal of utilization of ground tire rubber, market analysis and RAPUR Company analysis and deals with proposal of the production of the rubber floor article. The thesis also deals with technical and technological solution of the product production and analysis of the organization’s environment, external and internal factors and SWOT analysis. Outcome information is then used for the recommendation of the business plan.

This diploma thesis deals with the issue of rubber waste legislative focusing on waste tyres. The aim of the thesis is a thorough analysis of current legislative including newly prepared alterations with emphasis on specific lingering problems. A project of secondary material recycling, which has been created in current legal conditions, will be introduced. The project is assessed in terms of project managment methodology and the thesis concludes by suggesting an ideal project managment approach for realization of similar projects. Close cooperation has been established during realization of the project. At the same time, relevant government offices have been asked for information on the legislative and the whole issue has been consulted with respective offices. The introduction of the thesis familiarizes readers with basic points connected with project managment and tyres characteristics. Subsequently the relevant legislative related to waste tyres is mapped. The last part of the thesis is devoted to secondary material recycling project and its conclusion suggests the course of each of the project's life cycle stage using knowledge of project managment.

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.