vThe purpose of this study is to investigate an applicability of multi-intensity multi-area impact test and the viscoelastic model proposed in previous studies to a long pile synthetic turf. The multi-intensity multi-area impact tests and the parameter identification method of the exponential function type nonlinear Voigt model with impact area were performed to one of the long pile synthetic turf. To identify the parameters of the viscoelastic model, 20 impact trials with different intensity are preformed for each 8 different impact areas. Then the elastic parameters were calculated by least squares method prior to the viscous parameters as the primary identification. After the primary identification, the parameter searching was performed to minimize the relative standard error between the experimental forces and the estimated forces as a secondary identification. Finally, a unique set of parameters including area parameters were identified for 160 trials. Although the identification accuracy of some trials were not so high, the proposed model and the identification method can be applicable to the long pile synthetic turf because the low accuracy trials should be improved by the testing conditions, such as the uniformity of surface conditions.
The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics
