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Analysis of vehicles driving maneuvers at low coefficient of adhesion
Šabík, Matúš ; Sedlák, Robert (referee) ; Tokař, Stanislav (advisor)
This master’s thesis deals with driving maneuvers at low coefficient of adhesion, especially in winter season. It includes a list of adhesion coefficients on many surfaces, published by various authors. Figures were through the use of statistical methods divided into normal and exceeding. There are described terms having impact on adhesion. For determination of adhesion was used tests like emergency braking, circle test and slalom. The major part contains specification of used vehicles, surfaces, weather conditions, measuring devices and realized tests. In addition to using accelerometer, there was a successful attempt to use timekeeping facilities to determine deceleration of vehicle. Acquired data were processed and compared to another publications.
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Deceleration acting on the passengers in the frontal impact
Coufal, Tomáš ; Vémola, Aleš
The article is processed in sequence to article Mechanics of car frontal crash from conference (Expert Forensic Science) 2010 and deals with the deceleration acting on the passengers in the frontal impact. There is explained principle of obtaining the maximal deceleration acting on the passengers in the vehicle during the frontal impact from damage of the vehicle. From the point of view size of deceleration during the impact is obtained difference between restrained and unrestrained passenger. For an example about it what size achieves values of deceleration acting on the passengers during the frontal impact are processed and evaluated data from the dummy from the real crash test of the vehicle.
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Measuring the Deceleration of Motorcycles with the Use of Engine Braking
Vašica, Radoslav ; Semela, Marek (referee) ; Bradáč, Albert (advisor)
Diploma thesis deals with the deceleration of the motorcycles with the use of engine braking. Work can by divided into theoretical and practical part. The theoretical part begins with the possibility of division motorcycles according to several criteria. Below is given the primary papers of literature, usable in connection with the issue of this work. Subsequently, the work discusses the factors which are affecting the course of the deceleration with the use of engine braking. The practical part acquaints the reader with available measuring devices, with the place of measurement and the methodology. The following are listed specific measured values for individual motorcycles, supplemented with graphical output. At the end of the practical part is for comparison a brief summary of the measured values of each tested vehicle. Interpretation and evaluation of the measured data are contained in the conclusion of the work.
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The Measurement of Car Deceleration During Engine Braking
Bejčková, Jana ; Sedlák, Jaroslav (referee) ; Bradáč, Albert (advisor)
The presented diploma thesis deals with the measurement of car deceleration during engine braking from different starting speeds and different speed gears with a sample of vehicles. This piece of work consists of a theoretical part, where problem background is defined, selected driving parameters including the manner how to measure them are explained and the facts in the field of structural characteristics of the vehicle are given, further from a design of measurement methodology that gives an overall plan of implementation, all the respective information and a description of handling with decelerometer, further from a real measurement of the deceleration including an interpretation of partial obtained values and finally from the evaluation of all results with appropriate conclusions.
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Analysis of the Speed of Cyclists Aged from 10 to 15 Years
Valentová, Hana ; Semela, Marek (referee) ; Bradáč, Albert (advisor)
The thesis is concerned with an analysis of speed of bicyclists in age between 10 and 15 years. The thesis examines differences in construction of children's bikes, describes relationship between a child and a bicycle, messures size of children's bikes and characterizes the procedure during an analysis of bike accidents. Internal parts of the thesis are statistical data from accident frequency and summarizing of actual state of understanding of following problems in this age category. The main purpose of this thesis is to make an analysis of speed for individual age categories and make an evaluation of results. This measurement will be completed by a measure of achievable brake deceleration of riders in age between 10 and 15 years. The purpose of this final thesis is an expansion of data for a forensic expertise in area of Traffic.
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Analysis of the Speed of Cyclists Aged from 4 to 10 Years
Skanderová, Valentýna ; Semela, Marek (referee) ; Bradáč, Albert (advisor)
The diploma thesis Cyclists speed analysis at the age bracket of 4 to 10 deals with history and origin of bicycle, description and types of the contruction of bicycles for children at the age bracket mentioned above. The thesis includes the statistics of accidents involving cyclists and regulations providing for the ride on a bicycle on a carriageway. The practical part includes measuring cyclists speed when passing a measured section and the analysis of these data. The analysis of data is processed in terms of gear systems as the equipment. Complementary measuring was made in a slight rising. In the second part of the practical part is measured braking of cyclists at a particular age bracket and the evaluation of their deceleration. The conclusion includes comparison with measuring of other authors made so far.
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Selected Measurements of the Motion of Bicycles - Braking and Travelling Around Bends
Prčík, Stanislav ; Krejsa, Ivan (referee) ; Semela, Marek (advisor)
Diploma thesis Selected measurements of the motion of bicycles – braking and ridein the curve analyses problematic manoeuvres of bicycle riders according to the most typical accidents including bikes. There will be given statistics of bikers´ participation on accident amount that happened within last few years. The measurements of bicycles moving around bands of specific radiuses as a situation of most bicycle accidents will be described in the next part of this thesis. There will be also specified the values of average bicycle speeds when driving in curves with various radiuses according to types of bicycles, sex and experiences of the riders and will be an output of this thesis. Further on there will be measurements of braking in the direct line on various surfaces with different types of bikes and different brakes used.
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Simulator for check of seat belts function
Neuwirth, Zdeněk ; Prášil, Ludvík (referee) ; Mazůrek, Ivan (advisor)
Thesis is oriented on project construction universal apparatus for introduction and research effects deceleration and impact with possibility setting initial velocity. Basic application proposed test station is crash simulation for diagnostic safety belts. At first there're in work presented physical value that describe action in progress at impact, further safety belts, their testing and test . Considerable volume of work is devoted to project actuation, system obstruction kinetic energy and basic construction. Subsequently is presented proposed construction and performed strenght calculation. In the end there are summarized basic characteristics proposed construction, short financial opinion, process of installation and safety rules for using this equipment.
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Brake plate for rear automotive suspension
Krasula, Jan ; Klapka, Milan (referee) ; Mazůrek, Ivan (advisor)
This bachelor thesis main aim is proportional design of racing car rear brake shield. Race car was built in T1 group. At the beginning of thesis there will be devoted to introduce T1 group regulations and cross-country rally races. Questions of brakes and brake cooling will be resolved in second part. There will be calculations of cooling system function. At the end of thesis there will be place for design of brake shield.
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