Impulse Response Method for Frequency-Dependent Pipeline Transients

Li-sheng, Suo; Wylie, E. Benjamin

doi:10.1115/1.3243671

Cited by 65 publications

(31 citation statements)

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“…The use of the inverse Laplace transform (ILT) in the development of time-domain models from their Laplace transforms (LTs) has been extensive, however little attention has been given to full network models, with the exception being the impulse response method (IPREM) (Suo and Wylie, 1989). The approach presented here is entirely novel in that it couples the Laplace-domain input/output model from (Zecchin et al, 2009a) in a computationally efficient way with the Fourier series expansion NILT from Abate and Whitt (1995).…”

Section: Discussionmentioning

confidence: 99%

“…A limitation, however, is that most are formulated for only single pipelines, with few being formulated for a limited class of compound lines (Margolis and Yang, 1985;Yang and Tobler, 1991), and even fewer approaches being able to deal with the case of general networks (Suo and Wylie, 1989;Kojima et al, 2002). Despite this, no systematic and detailed study has been performed to compare ILT methods to their discrete counterparts for general fluid line network structures.…”

Section: Introductionmentioning

confidence: 99%

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Inverse Laplace Transform for Transient-State Fluid Line Network Simulation

2012

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inverse Laplace Transform for Transient-State Fluid Line Network Simulation

2012

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“…Consideration of the pressure damping impact for unsteady friction impact has evolved into two distinct modeling platforms; the two − dimensional (2−D) model considers the radial velocity distribution (Kim 2011;Suo and Wylie 1989;Zielke 1968), while the one − dimensional (1−D) model is based on instantaneous acceleration in the momentum equation (Brunone et al 1991;Ramos et al 2004). Experimental studies have evaluated several unsteady friction models that are related to these two distinct approaches (Adamkowski and Lewandowski 2006;Bergant et al 2001;Kim 2011;Reddy et al 2012).…”

Section: Introductionmentioning

confidence: 97%

Multiple Leakage Function for a Simple Pipeline System

Kim

2017

Water Resour Manage

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Leakage is responsible for pressure reduction and water loss in water distribution systems. Approaches for detection of leaks, based on the pressure variation impact from the boundary condition of a leakage point, have been explored to calibrate location and leakage quantity. Even through expression in the frequency domain allows precise description of abnormalities along pipeline systems, existing leakage formulations suffer from complexity in the analytical derivation for multiple leakage conditions. This study proposes an alternative method, the multiple leakage function (MLF), for an efficient multiple leakage representation of a reservoir pipeline valve system in the frequency domain. To address unsteady friction impact on a multiple leakage situation, the MLF was used with one-dimensional and two − dimensional unsteady friction models. Model validation was achieved by comparing impedance frequency responses with those of existing approaches. Strengths associated with the MLF were discussed in terms of model parsimony, computational accuracy, and leak detection capability. Feasibility of the MLF was confirmed for robustness in the leakage implementation sequence and for identification of any single leakage, which is useful in detecting multiple leakages in real systems.

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“…He investigated the use of the IRF for measuring the internal geometry of musical instruments and short air ducts. Suo and Wylie (1989) proposed the use of the IRF as a modelling tool in the IMPREM technique. The IRF from a pipeline was determined numerically by a method of characteristics model.…”

Section: Introductionmentioning

confidence: 99%

Leak location in pipelines using the impulse response function

Lee

Vítkovský

Lambert

et al. 2007

Journal of Hydraulic Research

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Current transient-based leak detection methods for pipeline systems often rely on a good understanding of the system-including unsteady friction, pipe roughness, precise geometry and micro considerations such as minor offtakes-in the absence of leaks. Such knowledge constitutes a very high hurdle and, even if known, may be impossible to include in the mathematical equations governing system behavior. An alternative is to test the leak-free system to find precise behavior, obviously a problem if the system is not known to be free of leaks. The leak-free response can be used as a benchmark to compare with behavior of the leaking system. As an alternative, this paper uses the impulse response function (IRF) as a means of leak detection. The IRF provides a unique a relationship between an injected transient event and a measured pressure response from a pipeline. This relationship is based on the physical characteristics of the system and is useful in determining its integrity. Transient responses of completely different shapes can be directly compared using the IRF. The IRF refines all system reflections to sharp pulses, thus promoting greater accuracy in leak location, and allowing leak reflections to be detected without a leak-free benchmark, even when complex signals such as pseudo-random binary signals are injected into the system. Additionally, the IRF approach can be used to improve existing leak detection methods. In experimental tests at the University of Adelaide the IRF approach was able to detect and locate leaks accurately. RÉSUMÉLes méthodes courantes de détection de fuite, basées sur le transitoire, pour les systèmes de canalisation reposent souvent sur une bonne connaissance du système-incluant le frottement instationnaire, la rugosité des conduites, la géométrie précise et des micro considérations telles que les evacuations mineures-en l'absence de fuites. Une telle connaissance constitue un obstacle majeur et, même si on en disposait, elle serait impossible à inclure dans les équations mathématiques régissant le comportement du système. Une alternative est d'examiner le système étanche pour en trouver le comportement précis, évidemment un problème si le système n'est pas connu pour être exempt de fuites. La réponse étanche peut être employée comme test-repère pour comparer le comportement du système avec fuite. Comme alternative, cet article utilise la réponse impulsionnelle (IRF) comme un moyen de détection de fuite. L'IRF fournit une relation unique entre un événement transitoire injecté et une réponse mesurée de pression d'une canalisation. Cette relation est basée sur les caractéristiques physiques du système et est utile pour déterminer son intégrité. Des réponses transitoires de formes complètement différentes peuvent être directement comparées en utilisant l'IRF. L'IRF fait ressortir toutes les réflexions du système aux impulsions brusques, favorisant de ce fait une plus grande exactitude dans la localisation de la fuite, et permettant à des réflexions de fuite d'être détectées sans l...

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Impulse Response Method for Frequency-Dependent Pipeline Transients

Cited by 65 publications

References 0 publications

Inverse Laplace Transform for Transient-State Fluid Line Network Simulation

Inverse Laplace Transform for Transient-State Fluid Line Network Simulation

Multiple Leakage Function for a Simple Pipeline System

Leak location in pipelines using the impulse response function

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