The Mathematical Model Analysis for Safe Stairs Dimension Based on Features of the Heel Trajectory
The purpose of this study was to examine the safety and accessibility of stairs for elderly people. We found that the heel trajectories tended to become more linear the faster the subjects descended the stairs from motion analysis, so we developed the mathematical model to reflect the linear trajectory. Using this model, we could calculate the K value, which is the shortest distance between the heel and the stair nosing. The value varied with the dimensions of the stairs, the tread and the rise, and other foot placement parameters for average descending and descending that deviates from the average. A negative K value indicated that the heel trajectory might hit the nosing of the stair if the experimental participant descended quickly. In this study, it was assumed that such stair dimensions could be dangerous. As a result, it can clarify the dimensional threshold R<0.56T (cm) that is deemed safe during average descent and the safe dimensional threshold R<0.30T (cm) taking into consideration descents that deviate from the average to create an index useful for preventing falling accidents when descending a stairway. Therefore it can be recommended that these dimensions are safe for elderly people.
Akihiro Ohnishi Yoshihiro Ehara
Human Engineering and Risk Management Research Grope, National Institute of Occupational Safety and Department of Prosthetics, Orthotics and Assistive Technologies, Faculty of Medical Technology, Niig
国际会议
17th World Congress on Ergonomics(第十七届国际人类工效学大会)
北京
英文
1-4
2009-08-09（万方平台首次上网日期，不代表论文的发表时间）