Download Metrology of Pedestrian Locomotion and Slip Resistance (ASTM by Mark I. Marpet, Michael A. Sapienza (editors) PDF

By Mark I. Marpet, Michael A. Sapienza (editors)

This specific booklet presents ten peer-reviewed papers which handle the newest international study touching on how a lot friction pedestrians require in the course of ambulation and the way to degree most sensible the friction on hand among the walkway floor and the shoe backside. themes comprise: biomechanics of ambulation, walkway-safety tribometry, and walkway-safety criteria improvement.

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Extra info for Metrology of Pedestrian Locomotion and Slip Resistance (ASTM Special Technical Publication, 1424)

Sample text

Surface. (2) With the further sliding, the heel contact was stabilized and striking time was also shortened. That is, progressive wear between two surfaces gradually changed the 46 METROLOGYOF PEDESTRIAN LOCOMOTION AND SLIP RESISTANCE surface conditions so that the contact area became wider and smoother. This means that heel contact time was shortened and a high level of matching between two surfaces was attained. (3) The heel toe-off time was also shortened with the continuous sliding so that the slope of each heel-strike angle became higher.

Standard shoes with rubber soles were supplied to all subjects to reduce COF variability between shoe sole and test-floor surfaces. Calculations of Dependent Measures Figure 2 illustrates typical slip parameters over time, starting at heel contact, which we defined as the instant when the vertical ground reaction force (GRF) exceeded 10N. To synchronize kinetic and kinematic variables, an LED was coupled to the vertical force output o f the force plates and when the force exceeded 10N the LED was triggered.

This instrument gave two separate signals that were proportional to the friction (horizontal) and normal (vertical) force components respectively. The two hydraulic cylinders were in a common circuit supplied by a pump that was driven by an electric motor. The force component signals and potentiometer voltage during a test were recorded on a desktop computer that continually calculated the H/V force ratio.. Test speed. 6 m/s. In a preliminary series of tests by Hoang et al. 6 m/s. 4 m/s. Heel strike angle.

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