抄録
To examine the rotating speed variation caused by roller slipping and the horizontal acceleration vibration of the rotating roller, we altered the experimental equipment so that reduction could be made about rigidity of the roller supporting part. The change of the structure enables us to measure structural vibration occurring in the rolling experiments on a fine coal. As a result, the higher natural frequencies about the structural system have changed into the lower. To investigate dynamic responses of the rolling roller, the rotating velocity of the roller, acceleration at the axis of rollers, the generated forced and etc. were measured. As a result, both the rotating speed variation and the horizontal vibration acceleration gradually increased in accordance with the running velocity of increase before decreasing at higher running velocity. In order to clarify the causes, we obtained the relation between the apparent friction coefficient and the slip ratio between the roller and the fine coal, from 0.10 [m/s] to 0.50 [m/s] at a running velocity. It is found that the dependency of the friction coefficient and the slip ratio is not remarkable. Extracting the frequency components around the natural frequencies of the experimental equipment, we calculated the RMS values for each running velocity. As a result, it is found that the lower natural frequency could be excited when the roller is rolling on a fine coal and the excited frequency components changed to higher according to the running speed.
