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Uncertainty evaluation for the calculation of a surface texture parameter in the profile case.

Harris, P M; Leach, R K; Giusca, C (2010) Uncertainty evaluation for the calculation of a surface texture parameter in the profile case. NPL Report. MS 8

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Knowledge of the topography of a machined surface is necessary in order to understand the functional performance of the surface, and is consequently essential to the manufacturing process. Surface texture parameters defined in ISO specification standards are widely used to associate numerical values to the measured topography. However, if the values of a parameter
are to be used for the comparison of different surfaces and for the interpretation of surface texture tolerances on engineering drawings, it is essential that the values are accompanied by statements of uncertainty. Furthermore, it is important that those statements are reliable and convey meaningful information about the parameter. Consideration is given to the problem of uncertainty evaluation for a particular (amplitude) surface texture parameter, viz., the root mean square value of a surface profile. A formulation of the problem is given in terms of a measurement model that defines the mathematical relationship between
all quantities involved in the measurement and the available information about those quantities. The applications of two approaches to solving the formulated problem, namely the conventional approach of `uncertainty propagation' and a Monte Carlo method that provides a more generally-applicable approach, are described. The results obtained from the two approaches for simulated measurement data are compared.

Item Type: Report/Guide (NPL Report)
NPL Report No.: MS 8
Subjects: Mathematics and Scientific Computing
Mathematics and Scientific Computing > Measurement Uncertainties
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/4708

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