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Proceedings Paper

Ultrasonic monitoring of a pipe under operating conditions
Author(s): Chang Liu; Joel Harley; Nicholas O'Donoughue; Yujie Ying; Martin H. Altschul; James H. Garrett Jr.; José M. F. Moura; Irving J. Oppenheim; Lucio Soibelman
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Paper Abstract

The paper presents experimental results of applying an ultrasonic monitoring system to a real-world operating hot-water supply system. The purpose of these experiments is to investigate the feasibility of continuous ultrasonic damage detection on pipes with permanently mounted piezoelectric transducers under environmental and operational variations. Ultrasonic guided wave is shown to be an efficient damage detector in laboratory experiments. However, environmental and operational variations produce dramatic changes in those signals, and therefore a useful signal processing approach must distinguish change caused by a scatterer from change caused by ongoing variations. We study pressurized pipe segments (10-in diameter) in a working hot-water supply system that experiences ongoing variations in pressure, temperature, and flow rate; the system is located in an environment that is mechanically and electrically noisy. We conduct pitch-catch tests, with a duration of 10 ms, between transducers located roughly 12 diameters apart. We applied different signal processing techniques to the collected data in order to investigate the ongoing environmental and operational variations and the stationarity of the signal. We present our analysis of these signals and preliminary detection results.

Paper Details

Date Published: 3 April 2012
PDF: 12 pages
Proc. SPIE 8345, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012, 83450B (3 April 2012); doi: 10.1117/12.915040
Show Author Affiliations
Chang Liu, Carnegie Mellon Univ. (United States)
Joel Harley, Carnegie Mellon Univ. (United States)
Nicholas O'Donoughue, Carnegie Mellon Univ. (United States)
Yujie Ying, Carnegie Mellon Univ. (United States)
Martin H. Altschul, Carnegie Mellon Univ. (United States)
James H. Garrett Jr., Carnegie Mellon Univ. (United States)
José M. F. Moura, Carnegie Mellon Univ. (United States)
Irving J. Oppenheim, Carnegie Mellon Univ. (United States)
Lucio Soibelman, Univ. of Southern California (United States)

Published in SPIE Proceedings Vol. 8345:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2012
Masayoshi Tomizuka; Chung-Bang Yun; Jerome P. Lynch, Editor(s)

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