Study On Pedestrians' Head Protection In Vehicle-pedestrain Collisions

As vehicle brings much convenience to our life, it also makes a significant threaten to the safety of peoples'life and property. In recent years, the accidents between pedestrian and vehicle are evidently increased as the number of vehicle becoming larger in china. Pedestrians are easily injured on roads as vulnerable groups, and the fatal head injury accounts for a larger percentage among the various pedestrians injuries. It has been shown by lots of study that the bonnet of vehicle is one of the central causes of pedestrian head injury. Thus, It has great significance to improve the bonnet protection capability of pedestrians'heads. The main study of this paper has conducted as follows:Firstly, according to the protection principle of pedestrians in EEVC, the finite element models of pedestrian head has been established, and its validity has been verified. It has been shown that the acceleration performance of the established model is up to the mustard, and it could be used in the future research.Secondly, the simulation model of pedestrian head crashing the bonnet has been established based on the finite element models of pedestrian head. The influence of parameters such as inner bonnet thickness, outer bonnet thickness, inclination angle, crash location and material on pedestrian head injury has been conducted, and the significance level of such parameters on pedestrian head injury has also been analyzed by Orthogonal Experiment.Finally, the parameters such as inner bonnet thickness, outer bonnet thickness, inclination angle and the yield strength of the material are adopted as study objects, and software HyperStudy is used to establish the surrogate models of pedestrian head crashing the bonnet by polynomial response surface method, moving least squares method and Kriging method. The models'fit precision, forecast precision and validity are analyzed. The most suitable surrogate models are selected and the optimization of the bonnet parameters has been done. The results show that the pedestrians protection performance of optimized bonnet has enormously improved.