이산요소법을 이용한 회전체의 크기에 따른 Washboarding 현상에 대한 영향 분석

Washboarding is a crucial problem occurring on unpaved roads. This phenomenon involves the formation ofripples on the surface of the unpaved road and causes a critical problem to vehicles and riders. The phenomenon isaffected by several parameters, but we focused on the velocity and the size of the rotating body. In the precedentresearch, we observed that a critical velocity existed for the occurrence of the phenomenon, and the phenomenon’sgrade was related to the velocity. Therefore, this study, using a discrete element method, aimed to analyze therelation between the velocity and the size of the rotating body for the occurrence of the phenomenon and perform afast Fourier transform (FFT) analysis to determine the correlation between the phenomenon and the period. Thestudy observed that the critical velocity could vary from the velocity and the size of the rotating body, and therewas a certain range of frequency for the occurrence of the Washboarding phenomenon.