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Efficient leak detection in single and branched polymeric pipeline systems by transient wave analysis

机译：通过瞬态波分析在单分支聚合物管道系统中有效的泄漏检测

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摘要

The widespread use of plastic pipes in different fluid conveyance systems has greatly driven the recent development and application of transient-based methods (TBMs) for leak detection in viscoelastic/polymeric pipelines. Current TBMs for viscoelastic pipe leak detection are usually achieved by a two-step procedure, namely viscoelastic parameters identification and leak detection, which requires the pre-knowledge of intact system states (i.e., non-leak) for comparative analysis. This paper presents an efficient single-step frequency domain inverse transient analysis (FDITA) method for simultaneous identifications of viscoelastic parameters and leaks in plastic pipes, so as to enhance the applicability and accuracy of TBMs. Both the single and branched polymeric pipe systems are applied for the method development and application. To this end, analytical solutions of single and branched systems from the transfer matrix method are firstly derived to represent the transient frequency responses of viscoelastic pipelines with leaks. A global optimized nonlinear curve fitting method is then employed to identify both viscoelastic parameters and potential leaks by knowing/measuring other system and flow conditions. Extensive experimental validations and numerical applications of both single and branched pipe systems demonstrate the very good efficiency and accuracy of the developed method for leak detection in different viscoelastic pipe systems. Furthermore, the mechanism of transient wave-leak-viscoelasticity is analysed based on these application results and theoretical evidence. Finally, a sensitivity analysis is performed to quantify and discuss the advantages and potential limitations of the developed method in the paper.
机译：在不同流体输送系统中的塑料管广泛使用，这极大地推动了近期基于瞬态的方法（TBMS）的开发和应用，用于粘弹性/聚合物管道中的泄漏检测。用于粘弹性管道泄漏检测的电流TBM通常通过两步程序，即粘弹性参数识别和泄漏检测来实现，这需要预先了解完整的系统状态（即，非泄漏）进行比较分析。本文介绍了一种有效的单步频域逆瞬态分析（FDITA）方法，用于同时识别粘弹性参数并在塑料管中泄漏，从而提高TBMS的适用性和准确性。单个和支链聚合物管道系统施加用于方法开发和应用。为此，首先导出来自转移矩阵法的单个和分支系统的分析解，以表示粘弹性管道具有泄漏的瞬态频率响应。然后采用全局优化的非线性曲线拟合方法来通过了解/测量其他系统和流动条件来识别粘弹性参数和潜在泄漏。单一和支化管系统的广泛的实验验证和数值应用展示了不同粘弹性管道系统泄漏检测方法的效率和准确性。此外，基于这些应用结果和理论证据分析瞬态波泄漏粘弹性的机制。最后，进行灵敏度分析以量化和探讨纸张中开发方法的优点和潜在限制。

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