Nonlinear method of determining the vehicle pre-crash speed based on B-spline with propabilistic weights - subcompact car class
Przemyslaw Kubiak 1  
,   Ewa Sys 1  
,   Lukasz Goslawski 1  
,   Maria Manko 2  
,   Jacek Gralewski 3  
,   Mateusz Krukowski 4  
,   Ricardo Alves de Sousa 5  
,   Adam Mrowicki 1  
,   Tigran Soghabatyan 1,   Tiefang Zou 6  
Department of Vehicles and Fundamentals of Machine Design, Lodz University of Technology, Polska
Institute of Polymer and Dye Technology, Faculty of Chemistry, Lodz University of Technology, Polska
Institute of Social Sciences and Management of Technologies, Lodz University of Technology, Polska
Institute of Mathematics, Lodz University of Technology, Polska
TEMA–Centre for Mechanical Technology and Automation, Department of Mechanical Engineering, University of Aveiro, Portugal
School of Automobile and Mechanical Engineering, Changsha University of Science and Technology, China
Przemyslaw Kubiak   

Department of Vehicles and Fundamentals of Machine Design, Lodz University of Technology, 1/15 Stefanowskiego Str.,, 90-924, Lodz, Polska
Data nadesłania: 19-02-2019
Data ostatniej rewizji: 24-03-2019
Data akceptacji: 12-09-2019
Data publikacji: 30-09-2019
The Archives of Automotive Engineering – Archiwum Motoryzacji 2019;85(3):5–18
A new non-linear method utilizing the work W of car deformation is considered in this study. The car deformation is defined as an algebraic function of deformation ratio Cs. The method of variable correlation is exploited in order to develop experimental data. To determinate mathematical model parameters, data from the NHTSA database including frontal crash tests are used. Such database is comprised of substantial number of crash cases and main focus was put on frontal impacts. In the non-linear method used so far, the so-called energetic approach, collisions are considered non-elastic. The speed threshold defining the elastic collision was set to be 11 km/h. This simplistic approach is used to determine the linear relation of energy loss during deformation on deformation coefficient Cs. Deformation points C1-C6 are taken into account while calculating a mean value that defines this coefficient. A more accurate non-linear method as well as more complex form of deformation coefficient is suggested to determine the work of deformation in this paper. The focus of those methods is to establish the value of nonlinear coefficient b_k which is the slope factor of precrash velocity Vt and deformation ratio Cs function.
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