抄録
While operating contact rotating systems, a periodic polygonal deformation pattern is formed on the peripheral surface of a roll. Such phenomena is called the pattern formation phenomena. The occurrence mechanism of pattern formation phenomena for some contact rotating systems was clarified by regarding the cause of phenomena as the unstable vibration generated in a time delay system. Linear analysis is sufficiently effective in order to estimate the occurrence region of the unstable vibration. However, most prevention methods using the analysis are those of raising some dumping ratio or avoiding unstable region by changing some system parameters. From the point of view of productivity, these methods are not necessarily effective. In this report, the authors suggest a prevention method of the unstable vibration generated in time-delay system using a dynamic absorber. The Runge-Kutta-Gill method is used to simulate the unstable vibration by adding some adequate nonlinearity. As a example, the 1-degree-of-freedom system with a roll which rotational speed changes broadly is investigated from the numerical computational results.
