転倒エアバッグのための転倒検出方法の検討

概要

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In order to prevent from an external injury in case of the fall for the aged people, a hip protector is commonly used. However, it is difficult to attach it to the body for a long time, because of difficulty to wear. In order to solve these problems, we are developing the system which prevents externally caused injury by expanding an air bag at the time of a fall. It is necessary to operate an air bag by detecting a fall before the impulse of a fall occurs, in order to develop this system. In this study, we reviewed the algorithm of the fall process, and determined the inflating trigger signals from the algorithm. To determine the triggering signal for the air bag, the mimicking fall, walking and jogging has been performed. The accelerometer was attached to the16younger healthy subjects, and the48mimicking falls were carried out. This experiment was approved by the ethic committee of Faculty of Engineering, Chiba University and written informed consent was obtained by each subject. The free fall acceleration could be observed around100to300[ms]before falling down completely. However, misdetection occurred while using the detection algorithm in jogging, which used the accelerometer.