【作者】 韩阳；

【导师】 冯新；

【作者基本信息】 大连理工大学 ， 建筑与土木工程（专业学位）， 2018， 硕士

【摘要】 供水系统作为城市用水的主要途径,是城市的重要基础设施,在保障人民生活和经济建设中发挥着重要的作用,对城市发展具有全局性和先导性的影响。近年来,对供水管网系统运行状态的监测和泄漏检测成为社会重点关注的问题之一。目前,采用分布式光纤技术在新建管道的监测和泄漏检测方面的应用相对较为成熟,而对大量的既有管道的泄漏检测技术是一个新的值得研究和开发的方向。本文对一种基于压力信号和流量信号的既有城市供水管网的泄漏识别和定位方法研究,并通过构建城市管道模拟泄漏试验平台的试验验证分析,对该方法关键技术进行讨论和改进,意图提高方法检测泄漏的准确率和定位精度。主要研究内容包括以下几个部分:(1)通过理论分析,对基于压力和流量信号的泄漏识别和定位方法进行论证;对负压波的特性和基于负压波延时估计的管道泄漏定位技术方法进行详细讨论;引入辅助流量判别,降低泄漏事件的误判率。(2)确定管网模拟泄漏试验平台相似设计的基本理论和相似准则;确定相似参数并计算模型各物理量数值;实际搭建起管网模拟泄漏试验平台,通过预试验对该模型各项物理参数进行验证和调整。(3)基于模拟试验平台,进行模拟泄漏试验,考察各个影响因素对基于压力和流量的泄漏识别和定位方法结果的影响;着重研究和对比了基于小波变换和STA/LTA数据处理方法的优缺点和差异之处,对信号分析方法进行改进提高。本试验研究,通过模拟试验的方式,对基于压力和流量信号的管道泄漏识别和定位方法进行详细讨论。指出该方法中的关键技术问题,并对问题产生的原因和解决方案进行论述。在提高该方法的泄漏识别准确率和定位精度上,发挥一定作用。更多还原

【Abstract】 Water supply network system,as the main transportation method of urban water,is an essential infrastructure of the city.It plays an important role in ensuring people’s livelihood and economic development,and has an overall and pilot influence on urban development.In recent years,the monitoring of the operating status and leakage detection of the water supply network system has become one of the major concerns of the society.At present,the application of distributed fiber optic technology in the monitor of new-built pipelines is relatively mature,while technic for numbers of existing pipelines becomes a new direction worthy of research and development.This paper proposes a study of leakage identification and location of existing urban water supply pipelines based on pressure signals and flow signals,and try to discuss and improve the key technologies of this method through experimental verification and analysis on urban pipeline simulated leakage test platform,attempting to improve leakage detection location accuracy of the method.The main research content includes the following sections:(1)Through theoretical analysis,the method for identifying and locating the leakage based on pressure and flow signals is demonstrated;the characteristics of negative pressure waves and the method of leakage location based on negative pressure wave delay estimation are discussed in detail;Introduction of auxiliary flow discrimination reduces the error rate of leakage detection.(2)Determine the basic theory and similarity criteria for similar design of urban pipeline simulated leakage test platform;establish similar parameters and calculate the value of each physical quantity model;set up the real simulated leakage test platform,and various validate and adjust physical parameters of the model by a series of pre-experiment.(3)Through the leakage test platform,simulated leakage experiments were conducted to examine the influence of various related factors on the results of leakage identification and location based on pressure signals and flow signals;the research and comparison of differences between wavelet-based and STA/LTA data processing methods were focused,trying to improve the signal analysis method.This experiment studies the method of identifying and locating pipeline leakage based on pressure and flow signals through a simulation test.Point out the key technical problems and discuss the causes and solutions to improve the accuracy of the leak detection of this method.更多还原