Development of a tumble avoidance and damage reduction system for elderly people in a cold region

以往的研究表明，滑步翻滚可分为“后翻”、“侧翻”和“反侧翻”三种类型。本研究利用VICON运动捕捉系统和测力板，探讨了股骨颈骨折后最危险的“侧翻”动作的回避机制。结果表明，当两条腿交叉早，两条腿之间的距离较宽时，翻滚避免成功。另外，针对某型安全气囊系统，通过胸部和脚踝的加速度变化，开发了防翻滚算法。研制了由H8单片机和加速度传感器组成的翻滚检测/识别系统。实验结果表明，在踝关节加速度较大的情况下，“侧翻”的判别算法有待改进。

In the previous study it was demonstrated that the slip-tumble was classified into three patterns such as `Backward tumble', "Side tumble' and `Reverse side tumble'. In this study, the avoidance mechanism of "Side tumble" that was most dangerous far the femur cervix fracture was examined by using VICON motion capture system and force plates. It was demonstrated that tumble avoidance succeeded when both legs crossed early, and the distance between both legs was wide. As a result, an airbag system for the tumble avoidance could be designed.In addition, the tumble avoidance algorithm was developed far a certain air bag system by acceleration change of a chest and ankle. The tumble detection/distinction system that was composed of H8 microcomputer and acceleration sensors was experimentally made. Consequently, the validity of the system was experimentally verified It emerged that the distinction algorithm for "Side tumble' should be improved when the acceleration of the ankle was large.