The Difficulty of Measuring Low Friction: Uncertainty Analysis for Friction Coefficient Measurements

[+] Author and Article Information
Tony L. Schmitz, Jason E. Action, John C. Ziegert, W. Gregory Sawyer

University of Florida, Department of Mechanical and Aerospace Engineering, Gainesville, FL 32611

J. Tribol 127(3), 673-678 (Jun 13, 2005) (6 pages) doi:10.1115/1.1843853 History: Received August 24, 2004; Revised August 27, 2004; Online June 13, 2005
Copyright © 2005 by ASME
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Schematic of the reciprocating tribometer constructed for this study
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A sketch of the force measurement geometry, where the misalignment angles α and β are not necessarily equal
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An error graph, showing lines of constant error as a function of misalignment angle α, where β is assumed to be equal to α
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Sample raw data (in Volts) from the load cell/conditioner pair during an experiment
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Graph of the collected friction coefficient traces. The mean value from this data is shown by the dark solid line; the >99% confidence interval is shown by the dashed lines.




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