第38卷第4期 2017年4月
仪器仪表学报 Chinese Journal of Scientific Instrument
气体管道泄漏声发射单一非频散模态定位
杨丽丽”，谢昊飞，李帅永，李伟雄，何明峰
Vol. 38 No. 4 Apr.2017
（1广西区气象技术装备中心南宁530000；2重庆邮电大学工业物联网与网络化控制教育部重点实验室重庆400065）摘要：针对气体管道泄漏声发射信号的多模态、频散特性导致互相关泄漏定位误差大的问题，提出采用单一非题散模态提取的气体管道泄漏声发射定位方法。对检测信号的互谱加窗，并根据模态波数确定窗参数，可获得泄漏声发射信号的单一非题散模态导波的互谱。对单一非频散模态导波的互谱进行傅里叶反变换，得到泄漏声发射中单一非频散模态信号的互相关函数以及时延估计，就可以采用单一非频散模态声速，更准确计算出池泄蒲位置。对气体管道泄漏进行定位实验，相比用未经分解的泄漏声发射信号进行定位，由于声发射单一非频散模态信号的相关性增强，且选用的声速更准确，定位相对误差平均降低7%以
上。这表明，通过提取泄漏信号互谱的单一非频散模态成分进行时延估计，可以提高泄漏检测的有效性和减小定位误差。关键词：泄漏定位；气体管道；单一模态提取；互功率谱
中图分类号：TN911.7TH86
文献标识码：A
国家标准学科分类代码：510.40
Leaklocationingaspipelinesbyextractionof singlenon-dispersive
modefromleakage-inducedacousticemissionsignal Yang Lili', Xie Haofei’, Li Shuaiyong,Li Weixiong', He Mingfeng
(I.Guangxi Autonomous Region Meteorological Technology Equipment Center,Nanning 53000O,China; 2.Key Laboratory of
Industrial Internet of Things & Netarorked Control, Ministry of Education, Chongqing Uniuersity of Posts and
Telecommunications，Chongqing 400065,China）
Abstract : The correlation-based leak location errors are large due to the multi-modal and dispersive characteristics of leakage-induced acoustic emission. One kind of leak location in the gas pipelines by extracting the single non-dispersive mode is proposed in this study. The cross-power spectrum of the single modal and non-dispersive component in the leak acoustic emission can be obtained by applying the weighing window with parameters of the wave number of the relative mode. Then, the cross-power spectrum of a single modal and non-dispersive component is analyzed by the inverse Fourier-transformed to acquire the cross-correlation for estimating the time delay Hence, the acoustic velocity of a single modal and non-dispersive component can be used for calculating the leak position more accurately. The experiments of leak location indicate that the relative error is reduced at least 7% . The reason is the enhancement of correlativity of a single modal and non-dispersive component in leak acoustic emission and the adoption of a more accurate acoustic velocity. It shows that the time-delay estimation by extracting the single-modal and non-dispersive component in the cross-power spectrum
of leakage-induced acoustic emission signals will enhance the leak detection and location Keywords: leak location; gas pipeline; single mode extraction; cross-power spectrum
国天然气管道建设，到2015年95%以上城市用上天然
1引言
天然气作为燃料因热值高、清洁，受到世界各国青咪。我国“十二五”规划指出要增加天然气消费，加快全收稿日期：2016-10Received Date:2016-10
气。天然气是易燃易爆有毒气体，一旦发生管道泄漏，将威胁人们的生命财产安全。因此及时发现和定位天然气管道泄漏，对社会可持续发展具有重要意义。
目前天然气管道泄漏检测方法主要有管内探测球法，
*基金项县国塞高技术研究发展计划（863计划）（2015AA043801）、重庆市基础与前沿研究计划（estc2015jcyjA40010）、重庆市教委科学技术研究项目（Ksb整璜重庆邮电大学科研启动基金（A2015-13）、重庆邮电大学青年科学研究项目（A2015-66）资助