The phenomenon called “stick-slip” is a type of self-excited vibration. When two objects slide against each other, the stick-slip phenomenon occurs. And it sometimes leads to problems, which are “chattering noise” in machining equipment, non-smooth movement in pneumatic cylinders, and others. Stick-slip phenomenon exhibits a variety of behaviors depending on the surrounding environment of the sliding parts, such as contact conditions and deformation of the objects. Therefore, it is difficult to analyze the behavior of the stick-slip phenomenon and to elucidate its mechanism. In this study, the stick-slip phenomenon was simulated using the discrete element method (DEM) with rolling springs to connect elements and a velocity-dependent friction law. The purpose of this paper is to examine the validity of the proposed calculation model. In the DEM calculation, particles are arranged in a single layer. The analytical results were compared with experimental results for stick-slip behavior by varying parameters such as the number of elements and the spring constant between them. The analysis results showed that even a simple single-layer model could simulate the stick-slip phenomenon. The terms of horizontal displacement and stick- slip period indicate a similar tendency in the analytical and experimental results.
NARITA et al. (Thu,) studied this question.