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Finite element modelling of oil-operated piston-cylinder pressure balances: determining uncertainties in distortion coefficient predictions using the finite element method.

Esward, T J (2002) Finite element modelling of oil-operated piston-cylinder pressure balances: determining uncertainties in distortion coefficient predictions using the finite element method. NPL Report. CMAM 85

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Abstract

This report documents the results of two projects which set out to use finite element methods to investigate the manner in which the pistons and cylinders of oil-operated pressure balances distort when they are subjected to high pressure. It sets out the results of predictions of piston-cylinder distortion coefficients for three pressure balances operated by the UK's National Physical Laboratory and one operated by Germany's Physikalisch-Technische Bundesanstalt. It derives uncertainty budgets for distortion coefficients based on calculations of variations in output of finite element models as the input parameters are varied. The results show clearly that accurate modelling requires precise knowledge of the elastic properties of the components of the balance and of the boundary conditions to be applied to the model. Finally, the report reviews the feasibility of three-dimensional modelling of pressure balances and makes recommendations for future research.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 85
Subjects: Engineering Measurements
Engineering Measurements > Mass, Force, Pressure
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2470

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