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Driving dynamics of a tractor
Renza, Jaroslav ; Bradáč, Albert (referee) ; Panáček, Vladimír (advisor)
This thesis analyses driving dynamics of tractors and its dependence on their weight and age. In the beginning, brief history of tractor development and definition of basic concept of the tractor analysis is described. The thesis states procedures for obtaining magnitudes necessary for determining of driving dynamics. Experimental part describes the realized measurement on chosen sample of tractors and interprets measured values. Last part of the thesis contains evaluation of the measurement results.
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Analysis of the influence of misuse and tire inflation on the stability of the vehicle in a limit situation
Porč, Karel ; Panáček, Vladimír (referee) ; Vémola, Aleš (advisor)
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.
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Lane change manoeuvre of modern vehicles on wet surface
Mikulec, Roman ; Kropáč, František (referee) ; Mičunek, Tomáš (referee) ; Semela, Marek (advisor)
This dissertation investigates the possibilities of determining the minimal duration of modern vehicles lane change manoeuvre on the wet road surface. In cases when the driver changed lanes or swerved before or during the crash, analysis of this manoeuvre should be carried out, as well as part of a collision avoidance investigation. The issue of lane change has been addressed in several theses in the past, but most of these theses were based on the results of measurements on the dry road surface. It is, therefore, necessary to investigate the applicability of the existing calculation methods to the situation of reduced adhesion conditions, together with the considerable time lag from most of the earlier studies, and therefore the considerable advances in vehicle design and driving stability systems. For this reason, several series of driving tests have been carried out with modern vehicles on predominantly wet road surfaces. These measurements have provided essential input and output variables used to analyse the current calculation methods and determine the set-up of the driving stability systems in simulation programs. Based on the statistical analysis, the so-called Kovařík equation, which has been used so far, was evaluated as the most suitable method for calculating the duration of lane-change manoeuvre, for which a new value of the mathematical constant was found. An alternative calculation of the longitudinal distance travelled by the vehicle in the manoeuvre is also presented in this dissertation.
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Lane change manoeuvre of modern vehicles on wet surface
Mikulec, Roman ; Kropáč, František (referee) ; Mičunek, Tomáš (referee) ; Semela, Marek (advisor)
This dissertation investigates the possibilities of determining the minimal duration of modern vehicles lane change manoeuvre on the wet road surface. In cases when the driver changed lanes or swerved before or during the crash, analysis of this manoeuvre should be carried out, as well as part of a collision avoidance investigation. The issue of lane change has been addressed in several theses in the past, but most of these theses were based on the results of measurements on the dry road surface. It is, therefore, necessary to investigate the applicability of the existing calculation methods to the situation of reduced adhesion conditions, together with the considerable time lag from most of the earlier studies, and therefore the considerable advances in vehicle design and driving stability systems. For this reason, several series of driving tests have been carried out with modern vehicles on predominantly wet road surfaces. These measurements have provided essential input and output variables used to analyse the current calculation methods and determine the set-up of the driving stability systems in simulation programs. Based on the statistical analysis, the so-called Kovařík equation, which has been used so far, was evaluated as the most suitable method for calculating the duration of lane-change manoeuvre, for which a new value of the mathematical constant was found. An alternative calculation of the longitudinal distance travelled by the vehicle in the manoeuvre is also presented in this dissertation.
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Analysis of the influence of misuse and tire inflation on the stability of the vehicle in a limit situation
Porč, Karel ; Panáček, Vladimír (referee) ; Vémola, Aleš (advisor)
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.
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Driving dynamics of a tractor
Renza, Jaroslav ; Bradáč, Albert (referee) ; Panáček, Vladimír (advisor)
This thesis analyses driving dynamics of tractors and its dependence on their weight and age. In the beginning, brief history of tractor development and definition of basic concept of the tractor analysis is described. The thesis states procedures for obtaining magnitudes necessary for determining of driving dynamics. Experimental part describes the realized measurement on chosen sample of tractors and interprets measured values. Last part of the thesis contains evaluation of the measurement results.
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