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Kinematics and Kinetics of the Shoe during Human Slips

机译：人体滑脱过程中鞋子的运动学和动力学

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摘要

This paper quantified the heel kinematics and kinetics during human slips with the goal of guiding available coefficient of friction (ACOF) testing methods for footwear and flooring. These values were then compared to the testing parameters recommended for measuring shoe-floor ACOF. Kinematic and kinetic data of thirty-nine subjects who experienced a slip incident were pooled from four similar human slipping studies for this secondary analysis. Vertical ground reaction force (VGRF), center of pressure (COP), shoe-floor angle, side-slip angle, sliding speed and contact time were quantified at slip start (SS) and at the time of peak sliding speed (PSS). Statistical comparisons were used to test if any discrepancies exist between the state of slipping foot and current ACOF testing parameters. The main findings were that the VGRF (26.7 %BW, 179.4 N), shoe-floor angle (22.1°) and contact time (0.02 s) at SS were significantly different from the recommended ACOF testing parameters. Instead, the testing parameters are mostly consistent with the state of the shoe at PSS. We argue that changing the footwear testing parameters to conditions at SS is more appropriate for relating ACOF to conditions of actual slips, including lower vertical forces, larger shoe-floor angles and shorter contact duration.
机译：本文量化了人滑过程中的脚跟运动学和动力学，目的是指导鞋类和地板的可用摩擦系数（ACOF）测试方法。然后将这些值与推荐用于测量鞋底ACOF的测试参数进行比较。从四个类似的人类滑倒研究中收集了39个滑倒事件的运动学和动力学数据，用于该次要分析。垂直地面反作用力（VGRF），压力中心（COP），靴底角，侧滑角，滑动速度和接触时间在滑动开始（SS）和峰值滑动速度（PSS）时进行定量。统计比较用于测试滑脚状态与当前ACOF测试参数之间是否存在差异。主要发现是SS的VGRF（26.7％BW，179.4 N），鞋底角（22.1°）和接触时间（0.02 s）与推荐的ACOF测试参数显着不同。相反，测试参数大多与PSS上鞋子的状态一致。我们认为将鞋类测试参数更改为SS的条件更适合将ACOF与实际滑移条件相关联，包括较低的垂直力，较大的鞋底角度和较短的接触时间。

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