Biofidelic Slip-Testing Device for Measuring & Analyzing Shoe-Floor Friction

用于测量的 Biofidelic 防滑测试装置

基本信息

批准号：
8456035
负责人：
Brian Moyer
金额：
$ 14.99万
依托单位：
CROSSROADS CONSULTING, LLC
依托单位国家：
美国
项目类别：
财政年份：
2013
资助国家：
美国
起止时间：
2013-06-06 至 2014-12-31
项目状态：
已结题

项目摘要

DESCRIPTION (provided by applicant): Falling accidents are among the largest and fastest growing sources of occupational injuries. Despite slips representing a plurality of all falling accidents, the technology used to assess the slipperiness of shoe and floor surfaces has remained relatively stagnant over the past two decades. A major limitation in existing slip-testers is that the under-shoe conditions that are experienced during slipping are not replicated in the testing device. Different testing conditions alter the tribological interaction at the shoe-floor interface and affect the coefficient of friction measurement. In addition, current testing methods only measure the coefficient of friction value, which does not provide sufficient information about the critical frictional mechanism to suggest a specific ergonomic intervention. The overall objective of this research is to develop a slip-testing apparatus that 1) mimics a human slip while measuring friction and 2) provides specific information on the shoe-floor interaction that can be used to guide the appropriate intervention. The rationale for mimicking the human slip is that recreating the loading conditions of the shoe during a slip will reproduce the tribological phenomenon at the shoe-floor interface and will lead to more accurate friction measurements; and that collecting additional data related to the tribological interaction will lead to improved ergonomic interventions that reduce slipping accidents. This project aims to establish proof-of-concept for this device through three specific aims. Specific Aim #1 is to develop a slip-testing device that mimics the under-shoe conditions of a human slip. A device will be developed with three individual degrees of freedom to individually control vertical force, anterior/posterior displacement/velocity and shoe angle. Sensors will simultaneously measure vertical force, sliding speed and shoe angle, which will be used in the closed-loop feedback control. The device will use PID control to track time-series profiles of human slips. Objective #1.1 will be to develop the device so that the coefficient of multiple determinations between human slipping data and the slip-testing data is greater than 0.9. Representative data from human slips will be used to demonstrate the ability of the device to mimic a variety of slipping profiles. Specific Aim #2 will validate the use of novel fluid pressure sensors to assess the role of tread on the shoe-floor-contaminant interaction. Inadequate tread has been demonstrated to lead to higher hydrodynamic pressures in the shoe-floor interface and lower shoe-floor coefficient of friction. Objective #2.1 will be to quantify the hydrodynamic pressures in order to provide feedback regarding whether a shoe tread intervention is necessary. Two hypotheses are used to test the effectiveness of this technology. Hypothesis 2.1 will test whether the force supported by the fluid is related to friction coefficient and Hypothesis 2.2 will test whether tread affects the fluid coefficient. Specific Aim #3 will be to assess reliability and reproducibility of the device. This research is expected to be a first step towards developing a device that is the gold standard in assessing slipperiness and that is useful for identifying optimal interventions for reducing slipping accidents.

描述（由申请人提供）：坠落事故是最大且增长最快的职业伤害来源之一。尽管滑倒代表了许多跌倒事故，但用于评估鞋和地板表面光滑性的技术在过去二十年中仍然相对停滞。现有滑移测试仪的主要限制的一个问题是，测试设备中不会复制打滑过程中所经历的鞋底条件。不同的测试条件会改变鞋与地板界面处的摩擦相互作用，并影响摩擦系数的测量。此外，目前的测试方法仅测量摩擦系数值，并不能提供足够的信息关键的摩擦机制建议特定的人体工程学干预。本研究的总体目标是开发一种防滑测试装置，该装置 1）在测量摩擦力时模拟人类滑倒，2）提供有关鞋与地板相互作用的具体信息，可用于指导适当的干预。模仿人类滑倒的基本原理是，在滑倒期间重新创建鞋子的负载条件将重现鞋子与地板界面处的摩擦现象，并将导致更准确的摩擦测量；收集与摩擦相互作用相关的额外数据将改进人体工程学干预措施，减少滑倒事故。该项目旨在通过三个具体目标来验证该设备的概念。具体目标#1是开发一种模拟人体滑倒时鞋底情况的防滑测试装置。将开发一种具有三个独立自由度的装置，以单独控制垂直力、前/后位移/速度和鞋角度。传感器将同时测量垂直力、滑动速度和鞋角度，用于闭环反馈控制。该设备将使用 PID 控制来跟踪人体滑倒的时间序列轮廓。目标#1.1 是开发该装置，使人体滑移数据与滑移测试数据的多重测定系数大于0.9。来自人体滑倒的代表性数据将用于证明该设备模拟各种滑倒轮廓的能力。具体目标 #2 将验证新型流体压力传感器的使用，以评估胎面在鞋-地板-污染物相互作用中的作用。不充分的胎面已被证明会导致鞋-地板界面中较高的流体动力压力和较低的鞋-地板摩擦系数。目标#2.1 是量化流体动力压力，以便提供关于鞋面干预是否必要的反馈。使用两个假设来测试该技术的有效性。假设2.1将检验流体是否支持力与摩擦系数有关，假设2.2将检验胎面是否影响流体系数。具体目标#3 是评估设备的可靠性和再现性。这项研究预计将成为开发一种设备的第一步，该设备是评估打滑情况的黄金标准，并且有助于确定减少打滑事故的最佳干预措施。