Collision Model Simplifications in the Dynamic Analysis With the SDC Method

Abstract

The number of motor vehicles in the European Union (EU) is constantly increasing, which is causing an increase in the traffic volume. This, in turn, boosts the economic development of the EU member states. However, an increase in traffic volume leads to road collisions and accidents, which lead to high repair costs. Some accident victims report fake vehicle damage to extort money for repairs. There are criminal groups that stage accidents for this purpose; thus, these claims are very difficult to verify. Thus, it is not enough to verify the sustained damage only by comparing the geometric parameters of the impact traces. New, modern research methods with simulation programs need to be used in order to reconstruct the course of an accident. The SDC (Static Dynamic Characteristic method) provides the possibility of vehicle damage verification, according to this convention. However, simplified modelling with the use of simulation programs involves the necessity of identification of input parameters in order to reconstruct a collision and the vehicle's post-collision movement. If the input parameters are not correct, the simulation results will also be incorrect, which will have a direct impact on the parties involved in potential legal proceedings, both civil and criminal. This study deals with the identification of the impact parameters and sensitivity of the simulation results to input data. Impact verification with the SDC method shows both a knowledge enhancement and a practical value. They can be used by experts, expert witnesses, computer programmers, researchers and students.

Determination of the Vertical Load on the Carrying Structure of a Flat Wagon with the 18–100 and Y25 Bogies

“…The mass and the moment of inertia of the carrying structure of the flat wagon with the design parameters and with the actual parameters were determined through their spatial models in SolidWorks software [10][11][12] The mass of the carrying structure of the flat wagon with the design parameters was 15.6 tons, the moment of inertia 283.1 ton × m 2 , and those with the actual parameters 11.1 ton and 102 ton × m 2 , respectively (Figure 5). Differential Equations ( 1)-( 6) were reduced to standard Cauchy problems and then they were integrated by the Runge-Kutta method [13][14][15][16][17][18]. The initial displacements and speeds were taken equal to zero.…”

“…Differential Equations ( 1)-( 6) were reduced to standard Cauchy problems and then they were integrated by the Runge-Kutta method [13][14][15][16][17][18]. The initial displacements and speeds were taken equal to zero.…”

“…The accelerations on the carrying structure of the flat wagon with the actual parameters on the 18-100 and Y25 bogies in the center of gravity are given in Figures 6 and 7 and the accelerations in the areas of support on the bogies in Figures 8 and 9. Differential Equations ( 1)-( 6) were reduced to standard Cauchy problems and then they were integrated by the Runge-Kutta method [13][14][15][16][17][18]. The initial displacements and speeds were taken equal to zero.…”