INVERSE DYNAMICS OF TAKE-OFF ON SKI-JUMPING SIMULATOR

Abstract

A special take-off simulator for ski-jumping was constructed to enable training of jumping skills. An inverse dynamics model was used to evaluate a take-off technique on that simulator. A 3D video based kinematical system was used to obtain body coordinates, which were then transformed to 2D sagittal plane. From a five link segment model the joint forces in horizontal and vertical direction as well as joint torques were calculated. Results showed sufficient sensitiveness of the method for a take-off assessment. A vibration effect, probably due to the low approaching velocity and thus a poorer balance, was observable, what was not a case in a normal snow conditions.