Gorzów Wlkp. 14.07.2019 MSc. Robert OWSIAŃSKI
Faculty of Transport
Silesian University of Technology
Abstract of PhD dissertation entitled
„Modeling of collisions of passenger cars in a two-dimensional system based on work body deformation”
Usually, after the road incidents, the causes and circumstances of their occurrence are investigated. The first link in the chain of proceedings are procedural bodies. The analysis of road accidents is usually based on determining the physical conditions of the collision and conducting a later time-space analysis.
This PhD work is devoted to the development of the method of accident reconstruction in the field of determining pre-crash speeds, the method based on the most permanent material evidence such as damage to vehicles. One of the main goals was to develop a tool useful for reconstructors, which is the original computer program Crash3Analyzer. One of thesis is the use of the impact pulse as the output parameter for calculating collisions with the use of shoot triangles. The second thesis is to use the impact force impulse to determine the collisional velocities by other methods than the shoot triangles.
The doctoral dissertation consists of nine chapters. In the first of these, literature data of methods based on Newtonian collision theory are given. The second chapter describes the wake-up traffic and presents examples of road accidents that can not be calculated by classical methods. The purpose and theses of the work are presented in the third chapter. The next chapter describes the algorithm for collision analysis. It presents the methodology of building closed triangles based on the impulse of impact force and shoots before and non-sparking. The fifth chapter describes the role of the impulse of the impact force in determining the speed and its use in the program. The previous results of the restitution coefficient were presented. The sixth part is a description of the stages of conduct in determining the deformation work of the body. It is proposed in this chapter to divide the body side structure due to the differentiation
of stiffness coefficients. The next chapter is to present the algorithm used in the application and describe the use of the energy balance. The successive eighth part is a development of the description of the program's functionality on examples. Examples of damage to passenger cars show the course of the impulse, shoots and arms of the impact force. The examples are closed with conclusions on the results obtained from various methods. The doctoral thesis is closed by a summary of the possibilities and limitations of using the adopted methodology and the Crash3Analyzer program.
