Studies on the Motion Analysis of Ski Turns and the 3D Posture Measurement of Skier in Gliding on the Actual Snow Field

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  • 実滑走におけるスキーヤーの3次元姿勢計測とターンの運動解析に関する研究
  • ミノル カッソウ ニ オケル スキーヤー ノ 3ジゲン シセイ ケイソク ト ターン ノ ウンドウ カイセキ ニ カンスル ケンキュウ

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Abstract

This paper deals with the motion analysis of ski turns and the 3D posture measurement of skier in gliding on the actual snow field. The measurement system consists of the inertial sensor（the 3-axis gyro sensor and the 3-axis acceleration sensor）and measures the 3-axis angular velocity and the 3-axis acceleration. We established the motion measurement method that estimates the 3D posture（Roll-Pitch-Yaw angles）in local coordinate system using the inertial sensor output. This method can compensate the drift error of gyro sensor output and avoid the effect of dynamic acceleration by applying the Unscented Kalman filter. Therefore, the method can be used to measure the motion of skier gliding on the actual snow field at high speed. We conducted the measurement experiment of carving and skidding turns by the skier gliding on the actual snow field. The measurement systems were attached to the body segments（upper body, lumber, upper thighs and lower thighs）of skier and the ski boots. The joint angles（lumber, hips, knees and ankles）of skier were calculated by applying the 3D posture to the inverse kinematics. The results of measurement experiment indicated quantitatively the joint angles of skier, and the analysis results represented the major features of skier in carving and skidding turns.

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