American Society of Civil Engineers


System Response Function–Based Leak Detection in Viscoelastic Pipelines


by Huan-Feng Duan, (corresponding author), (Research Associate, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China. E-mail: ceduan@ust.hk), Pedro J. Lee, (Senior Lecturer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800 Christchurch, New Zealand. E-mail: pedro.lee@canterbury.ac.nz), Mohamed S. Ghidaoui, (Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China. E-mail: ghidaoui@ust.hk), and Yeou-Koung Tung, (Professor, Dept. of Civil and Environmental Engineering, Hong Kong Univ. of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China. E-mail: cetung@ust.hk)

Journal of Hydraulic Engineering, Vol. 138, No. 2, February 2012, pp. 143-153, (doi:  http://dx.doi.org/10.1061/(ASCE)HY.1943-7900.0000495)

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Document type: Journal Paper
Abstract: The possibility of leak detection in a viscoelastic pipe system is studied. The frequency response function method (FRFM) is used for leak detection, and the analytical expression for the FRFM originally developed for an elastic pipeline is extended to the viscoelastic situation in this study. The extended FRFM is validated from numerical experiments with one-dimensional viscoelastic transient models. The analysis shows that the pipe-wall viscoelasticity effect has significant impact on the amplitude damping and phase shift of the pressure wave, but little influence on the leak-induced patterns of pressure head peaks in transient system frequency responses. The results indicate that the extended FRFM is applicable to the viscoelastic situation. The impact of viscoelastic parameters and incident wave bandwidth on the applicability of the extended FRFM i also investigated in this paper, and the results imply that transient input signals with rapid changes in time are preferable for leak location in viscoelastic pipelines.


ASCE Subject Headings:
Water pipelines
Hydraulic transients
Leakage
Viscoelasticity
Frequency response

Author Keywords:
Water pipelines
Transients
Leakage
Leak detection
Viscoelasticity
Frequency response function
Wave bandwidth