Studies on the dynamic analysis and motion measurement of skiing turn using extended kalman filter

Abstract

This paper proposes the motion measuitment system and the dynamic malysis methods of the skiing turn on an outside actual snowfield. This motion measuitment system that consists of inertial and magnetic field sensors provides 3-axis angular velocity, acceleration and intensity of magnetic field. This motion malysis method provides joint angle of lower body in skier using information from the motion measurement system, extended Kalman filter and inverse kinematics. In addition, this dynamic malysis method provides joint torque using joint angle, angular velocity, angular acceleration, acceleration, itaction force from the snow surface obtained from 6-axis force sensor and inverse dynamics. In order to indicate the performance of our proposed system, we have performed the measurement experiment of the skiing turn on an actual snowfield. It is found that the proposed method is able to analyze the major features of skiing turn and to evaluate quantitatively the skill and characteristics of skiers. © 2011 The Japan Society of Mechanical Engineers.