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Piston-cylinder pressure balance design with a negligible distortion coefficient.

Esward, T J; Preston, R C; Gélat, P N (2003) Piston-cylinder pressure balance design with a negligible distortion coefficient. Meas. Sci. Technol., 14 (6). pp. 796-806.

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Abstract

Finite element techniques have been used to design a controlled-clearance piston-cylinder pressure balance for operation in liquid media in the 250 MPa range in which the effective area is predictable, insensitive to variations in key geometrical and material parameters, and in which the distortion coefficient is negligible. The property which must be known most accurately is the Poisson's ratio of the piston-cylinder materials. The design is relatively insensitive to changes in Young's modulus. Finite element methods are shown to be a powerful technique for investigating the performance of pressure balances. It is demonstrated that, for the geometry in question, the free deformation mode of operation cannot meet these criteria, owing to its predicted distortion coefficient of 0.7164 ppm MPa-1, compared with 0.0012 ppm MPa-1 for the controlled-clearance design.

Item Type: Article
Subjects: Acoustics
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/2604

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