Modelling the stochastic nature of the available coefficient of friction at footwear-floor interfaces

Jared Gragg, Ellison Klose, James Yang

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The available coefficient of friction (ACOF) is a measure of the friction available between two surfaces, which for human gait would be the footwear–floor interface. It is often compared to the required coefficient of friction (RCOF) to determine the likelihood of a slip in gait. Both the ACOF and RCOF are stochastic by nature meaning that neither should be represented by a deterministic value, such as the sample mean. Previous research has determined that the RCOF can be modelled well by either the normal or lognormal distributions, but previous research aimed at determining an appropriate distribution for the ACOF was inconclusive. This study focuses on modelling the stochastic nature of the ACOF by fitting eight continuous probability distributions to ACOF data for six scenarios. In addition, the data were used to study the effect that a simple housekeeping action such as sweeping could have on the ACOF. Practitioner Summary: Previous research aimed at determining an appropriate distribution for the ACOF was inconclusive. The study addresses this issue as well as looking at the effect that an act such as sweeping has on the ACOF.

Original languageEnglish
Pages (from-to)977-984
Number of pages8
JournalErgonomics
Volume60
Issue number7
DOIs
StatePublished - Jul 3 2017

Keywords

  • Available coefficient of friction
  • footwear–floor interface
  • required coefficient of friction
  • slips and falls
  • stochastic nature

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