抄録
This paper deals with motion analysis of carving and skidding turns focusing acceleration components using actual gliding information. This information is measured by the inertial and magnetic field sensors attaching to the ski boot and the GPS receiver attaching to the top of skier's head. We conducted the measurement experiment of carving and skidding turns by a skier gliding on an actual snow field. The gliding velocity in slope coordinate was estimated by the accelerometer output, the GPS receiver output and the posture information, and the sum of centrifugal acceleration and Coriolis acceleration was calculated by the angular velocity, the gliding velocity and the posture information.
The gliding velocity in slope coordinate system was compared the gliding velocity in skier's coordinate system, we indicated that the vertical component of gliding velocity in skier's coordinate was included a part of lateral direction of gliding velocity in slope coordinate system. We represented that the cross product of angular velocity and the gliding velocity corresponds to the sum of centrifugal and Coriolis accelerations, and we indicated the centrifugal and Coriolis accelerations are the important factors for keeping the gliding velocity or accelerating the skier.
These results can be obtained from the systems used in this study and the analysis method indicated the effectiveness and the validity. The proposed method that can analyze the major features of skiing turn is able to quantitatively evaluate the skill.
