โ Scribed by J.M. MUGGLETON; M.J. BRENNAN; R.J. PINNINGTON
No coin nor oath required. For personal study only.
Water leaks are a topic of great concern in Britain and many other countries, because of decreasing water supplies and the deterioration of old pipework. Correlation techniques are widely used in leak detection, but for these to be e!ective, the propagation wavespeeds and wave attenuation must be known. Relatively predictable for metal pipes, these are largely unknown for the newer plastic pipes, being highly dependent on the pipe wall properties and the surrounding medium. In this paper, pipe equations for n"0 axisymmetric wave motion are derived for a #uid-"lled pipe, surrounded by an in"nite elastic medium which can support both longitudinal and shear waves. These equations are solved for two wave types, s"1, 2, which correspond to a #uid dominated wave and an axial shell wave, and expressions for a complex wavenumber for each wave are given.
2002 Academic Press
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