基于局域均值分解的燃气管道泄漏定位技术  

Gas Pipeline Leakage Location Technology Based on Local Mean Decomposition

作　　者：严欣明[1] 杜璋昊 毛小虎[1] 岳云飞[1] 郝永梅[2] Yan Xinming;Du Zhanghao;Mao Xiaohu;Yue Yunfei;Hao Yongmei(Jiangsu Institute of Special Equipment Safety Supervision and Inspection Branch Changzhou,Changzhou 213016;Changzhou University,Changzhou 213164)

机构地区：[1]江苏省特种设备安全监督检验研究院常州分院,常州213016 [2]常州大学,常州213164

出　　处：《中国特种设备安全》2020年第8期52-56,共5页China Special Equipment Safety

基　　金：江苏省重点研发计划专项项目(BE2018642);江苏省研究生科研创新项目(KYCX182622);常州市科技支撑计划(社会发展)项目(CE20185024)。

摘　　要：以声发射检测理论为基础,提出了一种基于局域均值分解的燃气管道泄漏定位方法.首先通过声发射检测系统采集管道泄漏信号,对泄漏信号进行局域均值分解,得到PF分量;然后通过计算各个PF分量的多尺度熵,提取含有主要泄漏信息的分量;最后对PF分量进行时频分析,得到时延差,通过互相关方法完成管道泄漏定位.实验结果表明:气体泄漏定位误差稳定在5%左右,而直接互相关定位误差为8%-9%,说明本文提出的方法可以更加精准的定位泄漏点位置.Based on the theory of acoustic emission detection,a gas pipeline leakage location method based on local mean decomposition(LMD)is proposed.Firstly,the pipeline leakage signal is collected by the acoustic emission detection system,and the leakage signal is decomposed by LMD to obtain the PF component.Then,the multi-scale entropy of each PF component is calculated to extract the component containing the main leakage information.Finally,the time-frequency analysis of the PF component is performed.The delay difference is obtained,and the pipeline leakage positioning is completed by the cross correlation method.The experimental results show that the gas leakage positioning error is stable at around 5%,and the direct cross-correlation positioning error is 8%-9%,which indicates that the proposed method can locate the leak point more accurately.

关 键 词：城市燃气管道 局域均值分解 多尺度熵 互相关 

分 类 号：X924[环境科学与工程—安全科学]