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Axisymmetric wave propagation in buried, fluid-filled pipes: effects of wall discontinuities

Muggleton, J.M. and Brennan, M.J. (2005) Axisymmetric wave propagation in buried, fluid-filled pipes: effects of wall discontinuities Journal of Sound and Vibration, 281, (3-5), pp. 849-867. (doi:10.1016/j.jsv.2004.02.045).

Record type: Article

Abstract

Water leakage from buried pipes is a subject of great concern in Britain and across the world because of decreasing water supplies due to changing rainfall patterns, deterioration of antiquated distribution systems, and an increasing population. Correlation techniques are widely used to locate the leaks, however, difficulties are encountered when repairs have been made to a pipe by inserting a new length of pipe to replace a damaged section. Although this practice is now discouraged, the new sections might be of a different material or possibly different cross-section or wall thickness. The wave propagation behaviour at such joints is poorly understood at present.
In earlier work, simple expressions for the wavenumbers of the s=1 (fluid-dominated) and s=2 (shell dominated) axisymmetric wave types were derived for a fluid-filled elastic pipe, both in vacuo and surrounded by an elastic medium of infinite extent. In this paper, the wave transmission and reflection characteristics of these waves at an axisymmetric pipe wall discontinuity in a fluid-filled piping system are investigated theoretically.
For changes in wall thickness or wall elasticity, simple expressions may be used to characterise the joint. The reason for this is that negligible energy conversion between the wavetypes occurs, so the wavetypes can be considered separately. For changes in the fluid cross-section, significant mode conversion occurs and the wavetypes must be considered together.

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Published date: 2005

Identifiers

Local EPrints ID: 28512
URI: http://eprints.soton.ac.uk/id/eprint/28512
ISSN: 0022-460X
PURE UUID: 1c597c76-dee4-4aae-b70c-1bbfa54ff6db

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Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:01

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Contributors

Author: J.M. Muggleton
Author: M.J. Brennan

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