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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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Biomechanical load analysis in case of child cyclist collision with passenger car
Schejbalová, Zuzana ; Lenková, Alžběta ; Mičunek, Tomáš
The safety of pedestrians and cyclists is justified especially in terms of prevention. This paper deals with the biomechanical analysis of load exerted on the child cyclist in configuration typical for cyclists (sudden enter the road or the case of non-giving way; the car front vs. the left side of the cyclists). Two tests were performed in the same configuration and nominal collision speed, the first one with a bicycle helmet and the second one without the helmet. Using the accelerometers in the head, chest, pelvis and knee of the dummy acceleration fields were detected, which is the cyclist exposed during the primary and secondary collision. In conclusion, the results will be interpreted by values of biomechanical load and severity of potential injuries including kinematic and dynamic comparison with a pedestrian vs. vehicle collision.
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