Mathematical Model of Long Pile Synthetic Turf for Calculating Shock Attenuation Properties in Various Conditions

The purpose of this study is to propose the mathematical model for long pile synthetic turf which can be used for evaluating the shock attenuation properties and to investigate the shock attenuation properties by using modeling and simulation method in various impact conditions. Although there were some improvements in the impact test for the long pile synthetic turf by adding the rod to the test foot for stable movement during impact, the unstable data are still observed because of the irregularity of the infill surface which can not be eliminated from the experiments for the long pile synthetic turf. Therefore, ten trials were performed to identify in each condition, i.e. the combination of 5 impact areas and 10 dropping heights makes 500 trials were performed for parameter identification. And the proposed model in this study is modified from the previous one. Finally, the calculated parameters could distinguish the difference of hardness and also simulate the dropping mass-spring model stably. As the results, various conditions, such as drop mass, impact duration, were simulated to acquire the FR values in each condition.