基于EWT及互时频的天然气管道泄漏定位

发布时间：2018-03-19 20:27

本文选题：泄漏定位　切入点：经验小波变换　出处：《仪器仪表学报》2016年12期 　论文类型：期刊论文

【摘要】：针对天然气管道泄漏定位的问题,提出一种基于经验小波变换(EWT)及互时频的泄漏定位方法。该方法首先采用EWT对泄漏信号进行分解,获得多个分量,进而提出根据互信息的敏感分量自适应选择算法,获取敏感分量;然后采用互时频法对敏感分量进行时频分析,根据互时频图的最大特征峰值计算时延和相关频率;最后根据频散曲线获得相关声波速度,实现对天然气管道泄漏点定位。实验结果表明,该方法能够实现管道泄漏点定位,与基于EMD的互时频法相比,定位精度明显提高。
[Abstract]:In order to solve the problem of leakage location in natural gas pipeline, a leakage location method based on empirical wavelet transform (EWT) and mutual time frequency is proposed. Firstly, EWT is used to decompose the leakage signal to obtain multiple components. Then an adaptive selection algorithm based on mutual information is proposed to obtain the sensitive component, and then the time-frequency analysis of the sensitive component is carried out by using the mutual time-frequency method, and the time delay and the correlation frequency are calculated according to the maximum characteristic peak value of the mutual time-frequency map. Finally, the correlation acoustic velocity is obtained according to the dispersion curve, and the location of leakage point in natural gas pipeline is realized. The experimental results show that this method can locate the leakage point of gas pipeline, and compared with the mutual time-frequency method based on EMD, the accuracy of the location is improved obviously.
【作者单位】：天津大学精密测试技术与仪器国家重点实验室;燕山大学信息科学与工程学院;
【基金】：博士学科点专项科研基金(20130032130001) 天津市科技兴海项目(KJXH201306) 天津市项目(14JCZDJC32300) 国家重点研发计划(2016YFC0802103)项目资助
【分类号】：TE973.6

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