223 クリート型二軸ロードセルを用いた下肢リンクモデルに基づくペダリング最適化システムの開発(センシング技術ほか)

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  • 223 Pedaling optimization system using link model of lower limbs with cleat-shaped biaxial load cells

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A new optimization system of cycling driving forces was investigated in this paper. This system was composed of newly developed cleat shaped biaxial load cells which measure biaxial-forces of right and left leg independently, and evaluation program for pedaling-effectiveness and joint torques with link model of lower limbs. The new load cells were attached to the bottom of cycling-shoes instead of the plastic cleats. Cyclist was able to connect their cycling-shoes to pedals by the load cells. The sizes of load cells were almost same as plastic cleats (Shimano Corp) and measure the magnitude and direction of right and left pedal force using 16-strain gages, respectively. The analytical system solves the link model of human lower limbs to identify the positions and angles of each segment of lower limbs. The lower limbs model consisted of 3 segments, thigh, lower thigh and foot. The length of the each segment, length of crank and position of greater trochanter were supposed to be constant for computational calculation. From the lower limbs model, all position of every lower limb segment and joint torques were calculated by this system. For analysis of the pedalling-effectiveness, each pedalling force measured by the load cells were converted to forces on coordinates respective to tangential and radial directions of cranks. The pedal angle was calculated by the link mechanism of lower limbs. The pedalling-effectiveness and relationships between cycling driving force and joint torques were investigated.

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