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Computation of run-off-road vehicle speed from terrain tracks__in forensic investigations.pdf

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Computation of run-off-road vehicle speed from terrain tracks__in forensic investigations

Available online at J/locate/jterra Journal of Terramechanics 50 (2013) 17–27 of TerramechanicsComputation of run-off-road vehicle speed from terrain tracks in forensic investigations La?szlo? Ma?the? ?, Pe?ter Kiss, Lajos Laib, Gyo?rgy Pillinger Szent Istva?n University, Faculty of Mechanical Engineering, Institute of Process Engineering, Department of Automotive Technology, H-2103 Go?do?ll}o, Hungary Available online 19 September 2012Abstract Analysis of a “run-off” accident requires a knowledge of the physical properties of the soil, otherwise any evaluation can only be approximate. In order to reconstruct a run-off accident one must examine the soil’s mechanical parameters and create a soil database. The purpose of our project was to make measurements for a later soil database and a computer simulation to determine the speed of a vehicle at the point where it left the road. A series of measurements were performed for this purpose at the Department of Automotive Technology of the Szent Istva?n University to obtain data for a soil database as part of a project to develop a run-off-the-road accident simulation model. The model is designed to determine the speed of the vehicle as it leaves the road. Knowledge of this speed is crucial in the investigation of such accidents, and investigators have to estimate it from vehicle tracks left on the road and on the adjacent terrain. The model may be validated and verified by determining the soil–vehicle resistances on relevant terrain. In our paper we introduce a set of computations capable of computing the vehicle’s initial velocity. 2012 ISTVS. Published by Elsevier Ltd. All rights reserved. Keywords: Accident analysis; Soil–tire interaction; Terramechanics; Soil-mechanical parameters1. Introduction The results of terramechanics research can be usefully applied to describe the motion of vehicles moving on ter- rain. These include agricultural and forestry vehicles [5,9– 12,16,21], military and civilian off-road vehicle