THE EVALUATION OF KINEMATIC MEASURES WHICH CHARACTERIZE THE VEHICLE-PEDESTRIAN ACCIDENTS

Adrian TODORUŢ, Nicolae CORDOŞ, István BARABÁS, Monica BĂLCĂU

Abstract


This paper evaluates the kinematic measures of a vehicle-pedestrian accident in its various stages from the physical and mathematical point of view. The parameters resulting from the primary research of the accident scene and the testimonial evidence are taken into account when evaluating the kinematic measures which characterize such an accident. Thus, by the reconstruction of car accidents with pedestrians it shall be determined: the time that passed from the beginning of the pedestrian's projection to the pedestrian's fall on the ground; the distance covered by the pedestrian from the beginning of his/her projection on the ground; the horizontal and vertical components of the pedestrian's speed at the fall on ground; the resulting speed with which the pedestrian's body starts moving after the fall on the ground; the distance on which the pedestrian's body slides on the roadway; the distance on which the pedestrian is projected from the initial contact to the moment he/she stopped on the roadway, etc.
The study considers various longitudinal inclinations of the road, various inclination of the pedestrian's trajectory, various impact speeds and various pedestrians (male/female - 5%; 50%; 95%), the vehicle being one with advanced motor (car).
The results obtained are graphic results which offer the possibility of revealing various stages of the accident. The numerical model developed can be applied to the reconstruction of vehical-pedestrian accidents in order to establish their dynamics occurance and, at the same time the influence of various factors which contribute to the evolution of such accidents.
The computerized analysis with its advantages (reduction of calculation time, simulation of various accident situations, etc.) becomes a useful and necessary tool for the technical experts and engineers who carry on their activity in the field of reconstruction of car accidents and development of car security systems. Given the complexity of the numerical models developed, the use of the computerized analysis in the reconstruction of car accidents can be a trsutful tool used by specialists.


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References


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