基于双树复小波及递归图的管道泄漏定位方法  

Pipe Leak Location Method Based on Dual-tree Complex Wavelet Transform and Recurrence Plot

作　　者：王惠新[1] 王玉田[1] 黄满义 王晓婧[1] 张淑清[1] 陈颖[1] 王世豪[1] 

机构地区：[1]燕山大学电气工程学院河北省测试计量技术及仪器重点实验室

出　　处：《计量学报》2015年第6期617-621,共5页Acta Metrologica Sinica

基　　金：国家自然科学基金(61077071);河北省高等学校科学技术研究重点项目(ZD2014100)

摘　　要：提出双树复小波变换（DTCWT）及递归图（RP）平均灰度的输油管道泄漏检测定位方法。DTCWT能够克服传统离散小波变换的缺点，完整提取信号特征。RP平均法能够对泄漏前、中、后期对角线附近的相邻区域给出明显分界线，与传统小波模极大方法比较，能更加准确地定位泄漏点。对监测点采集到的压力信号进行双树复小波变换提取特征信号；然后，对特征信号进行递归图分析，变化区域明显的分界点即为发生泄漏的特征时刻；最后根据负压波定位原理确定泄漏点具体位置。仿真实验验证了该方法的有效性和优越性。A method of pipeline leak detection and location which is combined dual-tree complex wavelet transform （ DT CWT） and recurrence plot （RP） average gray was introduced. DT CWT could overcome the shortcomings of traditional discrete wavelet transform and extract the signal feature completely. The RP average gray method could give the clear boundary of adjacent areas near the diagonal for prophase, interim and later stage of leak and locate leaks more accurately comparing with traditional wavelet modulus maxima method. The pressure signals of monitoring points were transformed by the dual-tree complex wavelet to extract characteristics of the signal. Then, according to analyzing characteristics of the signal by RP, the demarcation point that changed significantly of the area was determined as the leakage characteristic time. Finally, the leakage location was determined based on the principle of negative pressure wave. Simulation results showed the effectiveness and the superiority of this method.

关 键 词：计量学 管道泄漏检测定位 负压波 双树复小波变换 递归图 

分 类 号：TB937[一般工业技术—计量学]