Publikationsserver der RWTH Aachen University
Fahrzeug-Kompatibilität im Seitenaufprall
Abstract
dc:descriptionThe side impact gained more importance in the course of the last years. This is partially because of the fact that the safety level in the frontal impact rose clearly by many safety devices (Airbag, pre-tensioner, belt force limiter, crash zone, strong passenger compartment …). The reason for the high risk in side impacts is that bullet and target vehicle are mostly not compatible with each other. In the context of this work an investigation of the influences factors in side impact compatibility was carried out. The importance of the side impact was illustrated by accident data. Large progress in the area of soft and hardware made it possible to calculate numerically within a short time and with small costs physical procedures with sufficient accuracy. Numerical Simulation was used to investigate the influence factors of the side impact. The numeric models were validated on the basis a physical test. Before however the results from simulation and reality could be compared, three stages of the numerical model were numerically illustrated. In the first a dummy sat in an abstracted model of a vehicle interior. The models were extended up to the next model stage, in which a whole vehicle was represented by ellipsoids and by the numeric model of a EEVC Side Impact barrier. However it was recognized that the complex technical and geometrical structures of a vehicle body can be better illustrated by the finite element analysis method (FEA).Accordingly, FEA was used in the next model stage, which confirmed at the same time the numeric representation of the side impact model. After satisfying security of the numeric model twelve simulations were accomplished, in which different parameters were changed. Vehicle mass, barrier impact speed, the front of the bullet vehicle and the point of impact were changed. Measurement results of two EUROSID and the deformation mode of the target vehicle were evaluated in these parameter variations. It was shown that against expectation an even and wide intrusion did not always affect the Dummy results positively. From these parameter variations one case was selected and conducted a physical test for validation. This case represents "worst case" for the target vehicle, since in this impact configuration the bullet vehicle is over-riding the side sill of the target vehicle. The results from simulation and reality show to a large extent good agreements regarding deformations and the kinematics of both vehicles and dummies.A suggestion on the improvement of the compatibility in side impacts was realised. This consisted of filling the side sill of the target vehicle with polyurethane foam to stiffen the side sill and provide additional energy absorption potential at the same time. Thus both intrusion and lateral acceleration of the target vehicle were reduced. Both reduced the occupant load in the target vehicle. The best foam specification was identified by parameter variations with the target of minimising the occupant load. The effectiveness of this measure could be proven. In order to confirm the results, a final validation test was carried out. It can be stated that the used numerical models, in particular for the selected task, were well suitable. The results of this work support the statement that the selected measure – to fill the side sill with a suitable foam – improves the compatibility in side impacts.
Degree
thesis:*- Grantor dc:publisher
- Publikationsserver der RWTH Aachen University
- Year dc:date
- 2005
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Kreuzinger, Tjark
- Contributors dc:contributor
-
- Wallentowitz, Henning
Subjects
dc:subject × 13Rights
dc:rights- Statement dc:rights
-
- info:eu-repo/semantics/openAccess
- Language dc:language
- ger