自选慢、中、快走速度时车削所需的摩擦系数。
Required coefficient of friction during turning at self-selected slow, normal, and fast walking speeds.
机构信息
Department of Mechanical Engineering, Virginia Polytechnic Institute and State University, USA.
Grado Department of Industrial and Systems Engineering, Virginia Polytechnic Institute and State University, 557 Whittemore Hall, MC 0118, Blacksburg, VA 24061, USA.
出版信息
J Biomech. 2014 Apr 11;47(6):1395-400. doi: 10.1016/j.jbiomech.2014.01.032. Epub 2014 Feb 17.
Abstract
This study investigated the relationship of required coefficient of friction to gait speed, obstacle height, and turning strategy as participants walked around obstacles of various heights. Ten healthy, young adults performed 90° turns around corner pylons of four different heights at their self selected normal, slow, and fast walking speeds using both step and spin turning strategies. Kinetic data was captured using force plates. Results showed peak required coefficient of friction (RCOF) at push off increased with increased speed (slow μ=0.38, normal μ=0.45, and fast μ=0.54). Obstacle height had no effect on RCOF values. The average peak RCOF for fast turning exceeded the OSHA safety guideline for static COF of μ>0.50, suggesting further research is needed into the minimum static COF to prevent slips and falls, especially around corners.
摘要
本研究调查了在参与者绕不同高度障碍物行走时，所需摩擦系数与步速、障碍物高度和转弯策略的关系。10 名健康的年轻人分别以正常、慢和快三种步速，采用跨步和旋转两种转弯策略，围绕四个不同高度的角锥体进行 90°转弯。动力学数据通过测力板收集。结果显示，随着速度的增加（慢 μ=0.38，正常 μ=0.45，快 μ=0.54），蹬离时所需的最大摩擦系数（RCOF）峰值增加。障碍物高度对 RCOF 值没有影响。快速转弯的平均最大 RCOF 超过了 OSHA 关于 μ>0.50 的静态 COF 的安全指南，这表明需要进一步研究防止滑倒和跌倒的最小静态 COF，尤其是在拐角处。
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