抄録
The purposes of this study was to develop a simulator generating a ski board vibration in actual skiing and to clarify the relationship between ski board vibration and a coefficient of kinetic friction. In the simulator developed in this study, the surface on the bottom of the ski was assumed as to be a snowy slope and a mass of snow (snow pack) assuming a skier had slid on this ski bottom surface. A ball vibrator connected to a large-sized compressor was installed onto the ski panel in order to vibrate a ski board. The compressed air from the compressor rotated a steel ball in the vibrator at high speed, causing vibration on the ski. A dynamic friction force (F) was detected by the digital force gauge when the snow pack was sliding on the surface in isokinetic condition using a traction device. A traction velocity was controlled automatically using controller. A coefficient of kinetic friction was calculated using this dynamic friction force. The experiment using this simulator was carried out in the laboratory conditions. On this experimental result, the relationship between the coefficient of kinetic friction and sliding velocity in non-vibration (0Hz) condition was not significant statistically. On the other hand, the coefficient of kinetic friction decreased with increasing in sliding velocity in vibration (253Hz) condition and both relationship was significant statistically. From these results, it is clarified that the mechanical dynamic vibration reduces the coefficient of kinetic friction with increasing in the sliding velocity.
