321 A Study on Estimation Method of Spring and Attenuation Constants of Skier Using Extended Kalman Filter

Abstract

This paper proposes the estimation method of spring and attenuation constants of skier. Skier conducts ski turns three-dimentionaly, and the motion is complexity. The joints of skier are used such as spring and damper in turns. Therefore, it is necessary to claryfy the effect of spring and attenuation by the joints of skier gliding on the actual snow field. However, the spring and attenuation constants change during turns. In this study, we propose the estimation method of spring and attenuation method using the joint internal force, relative displacement and relative velocity. The Extended Kalman filter is used as the estimation algorithm. We applied the estimation method to the motion information of skier gliding on the actual snow field, and we estimated the spring and attenuation constants. These results indicated the major features of skier's motion.