走行中の衝撃を考慮した競技用義足の挙動計測に関する研究

抄録

The objective of this study was to improve the impact testing apparatus which was designed and manufactured in our previous study so that more various impact conditions could be reproduced and to investigate effects on the conditions of the dynamic behavior of the blade by quantifying its behavior. The impact apparatus was improved by introducing the structure capable of changing the mass of impactor into the first one. Impact tests were conducted to obtain the impact load and the deformation of a blade. A motion of the impactor and blade was taken by two synchronized high-speed video cameras. The deformation of blade was obtained from the positional coordinate of the blade by tracking markers attached on their surfaces using the digital image correlation method. The impact load was measured by a piezoelectric type load cell affixed on the impactor. As a result, the stiffness of the blade may tend to be suddenly varied during the loading process. This suggests that the difference of impact behavior, which cannot be observed using pre-improved apparatus, can be observed by loading higher impact to the blade. The impact velocity may strongly affect the rebound characteristics of the blade under the same conditions of the value of impulse.