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Dispersion behavior of torsional guided waves in a small diameter steel gas pipe

Dispersion behavior of torsional guided waves in a small diameter steel gas pipe
Dispersion behavior of torsional guided waves in a small diameter steel gas pipe
Condition monitoring of gas pipes has been an important issue for gas companies. Failure to accurately identify condition of gas pipes result in numerous problems. Also, producing a condition monitoring system for buried pipelines is challenging. Small pipes (with diameters less than 50 mm) are considered here as most of the literature focuses on larger pipes. Guided wave theory will be introduced alongside a numerical simulation of the relevant dispersion curves of the system. This paper investigates the feasibility of using torsional guided waves for inspecting defects in buried pipes with small diameters. The pipes are assumed to be lossless and hence the effect of attenuation is ignored in the calculations. Upon finding the theoretical guided wave characteristics, experiments were conducted to see if the aim could be achieved in a realistic scenario. A steel pipe with a diameter of 34 mm and wall thickness of 5.5 mm is considered. High reverberation levels at high frequency propagations due to mode conversion are studied. Having only a limited number of transducers could be a reason for high reverberation at high frequencies.
condition monitoring, dispersion, guided wave method, piezoelectric elements, torsional Mode
Zaghari, B.
a0537db6-0dce-49a2-8103-0f4599ab5f6a
Humphrey, V.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Moshrefi-Torbati, M.
65b351dc-7c2e-4a9a-83a4-df797973913b
Zaghari, B.
a0537db6-0dce-49a2-8103-0f4599ab5f6a
Humphrey, V.
23c9bd0c-7870-428f-b0dd-5ff158d22590
Moshrefi-Torbati, M.
65b351dc-7c2e-4a9a-83a4-df797973913b

Zaghari, B., Humphrey, V. and Moshrefi-Torbati, M. (2013) Dispersion behavior of torsional guided waves in a small diameter steel gas pipe. 19th International Conference on Automation and Computing (ICAC’13), United Kingdom. 13 - 14 Sep 2013. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Condition monitoring of gas pipes has been an important issue for gas companies. Failure to accurately identify condition of gas pipes result in numerous problems. Also, producing a condition monitoring system for buried pipelines is challenging. Small pipes (with diameters less than 50 mm) are considered here as most of the literature focuses on larger pipes. Guided wave theory will be introduced alongside a numerical simulation of the relevant dispersion curves of the system. This paper investigates the feasibility of using torsional guided waves for inspecting defects in buried pipes with small diameters. The pipes are assumed to be lossless and hence the effect of attenuation is ignored in the calculations. Upon finding the theoretical guided wave characteristics, experiments were conducted to see if the aim could be achieved in a realistic scenario. A steel pipe with a diameter of 34 mm and wall thickness of 5.5 mm is considered. High reverberation levels at high frequency propagations due to mode conversion are studied. Having only a limited number of transducers could be a reason for high reverberation at high frequencies.

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More information

Published date: September 2013
Venue - Dates: 19th International Conference on Automation and Computing (ICAC’13), United Kingdom, 2013-09-13 - 2013-09-14
Keywords: condition monitoring, dispersion, guided wave method, piezoelectric elements, torsional Mode
Organisations: Mathematical Sciences, Inst. Sound & Vibration Research, Engineering Science Unit

Identifiers

Local EPrints ID: 366809
URI: https://eprints.soton.ac.uk/id/eprint/366809
PURE UUID: f97ad219-0d3a-435a-ab51-2515c145be79
ORCID for V. Humphrey: ORCID iD orcid.org/0000-0002-3580-5373

Catalogue record

Date deposited: 10 Jul 2014 13:21
Last modified: 06 Jun 2018 12:45

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