Optimization of Pipeline Leakage Detection System in Utility Tunnel Based on Finite Element Method

IF 4.6 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Yongli Liu, Jiao Wang, Tiantian Xue, Henglin Xiao, Yanshuang Yang
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引用次数: 0

Abstract

In addressing the problems of delayed detection, inefficient identification, and coverage blind spots in optical fiber-based pipeline leakage detection within pipe galleries, this study proposes a leakage detection strategy utilizing distributed optical fiber temperature measurement technology. Finite element method is employed to analyze the temperature influence radius around the pipeline leakage hole and a model test is conducted as a validation. The results show that the temperature field image at the leakage site is elliptical, influenced by temperature differences between ambient and liquid. An increase in this temperature difference accelerates changes in the temperature field’s range. Adjustments to the optical fiber’s winding angle and pitch demonstrated that an optimal pitch is 1/24 of the pipeline’s length, with a 45° winding angle. This configuration maximizes the optical fiber’s distribution in detection while maintaining its cost-effectiveness. When the leakage site is constant, and only the winding mode is altered, it is observed that when the ambient temperature exceeds the liquid temperature in the pipeline, the temperature of the escaping liquid impacts the temperature-measuring fiber due to gravity, registering approximately 2°C higher than the temperature measured directly at the leakage site. The temperature anomaly from field diffusion is significantly less than that caused by the water flow from the leakage impacting the fiber due to gravity. Conversely, when the ambient temperature is lower than the pipeline’s liquid temperature, the opposite occurs. These research findings offer a novel approach for distributed detection in water supply and drainage pipeline leakage.

Abstract Image

基于有限元法的公用事业隧道管道泄漏检测系统优化
针对基于光纤的管廊内管道泄漏检测中存在的检测延迟、识别效率低和覆盖盲区等问题,本研究提出了一种利用分布式光纤测温技术的泄漏检测策略。采用有限元法分析了管道泄漏孔周围的温度影响半径,并进行了模型试验验证。结果表明,泄漏点的温度场图像是椭圆形的,受环境温度和液体温度差的影响。温差的增加会加速温度场范围的变化。对光纤缠绕角度和间距的调整表明,最佳间距为管道长度的 1/24,缠绕角度为 45°。这种配置既能最大限度地扩大光纤在检测中的分布范围,又能保持其成本效益。当泄漏点不变,仅改变缠绕模式时,可以观察到当环境温度超过管道中的液体温度时,逸出液体的温度由于重力作用会影响测温光纤,比直接在泄漏点测量的温度高出约 2°C。现场扩散造成的温度异常明显小于泄漏水流在重力作用下冲击测温光纤造成的温度异常。相反,当环境温度低于管道的液体温度时,则会出现相反的情况。这些研究成果为给排水管道泄漏的分布式检测提供了一种新方法。
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来源期刊
Structural Control & Health Monitoring
Structural Control & Health Monitoring 工程技术-工程:土木
CiteScore
9.50
自引率
13.00%
发文量
234
审稿时长
8 months
期刊介绍: The Journal Structural Control and Health Monitoring encompasses all theoretical and technological aspects of structural control, structural health monitoring theory and smart materials and structures. The journal focuses on aerospace, civil, infrastructure and mechanical engineering applications. Original contributions based on analytical, computational and experimental methods are solicited in three main areas: monitoring, control, and smart materials and structures, covering subjects such as system identification, health monitoring, health diagnostics, multi-functional materials, signal processing, sensor technology, passive, active and semi active control schemes and implementations, shape memory alloys, piezoelectrics and mechatronics. Also of interest are actuator design, dynamic systems, dynamic stability, artificial intelligence tools, data acquisition, wireless communications, measurements, MEMS/NEMS sensors for local damage detection, optical fibre sensors for health monitoring, remote control of monitoring systems, sensor-logger combinations for mobile applications, corrosion sensors, scour indicators and experimental techniques.
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