| 基于小波包分解的多尺度互相关管道定位方法 |
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| 引用本文： | 张景川,曾周末,张兆伟,程向丽,张溪默.基于小波包分解的多尺度互相关管道定位方法[J].纳米技术与精密工程,2011,9(2):162-167. |
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| 作者姓名： | 张景川 曾周末 张兆伟 程向丽 张溪默 |
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| 作者单位： | 天津大学精密测试技术与仪器国家重点实验室,天津,300072 |
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| 基金项目： | 国家自然科学基金重点资助项目，教育部博士点基金资助项目 |
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| 摘 要： | 针对直接互相关时延估计法定位管道故障点存在定位精度差的问题,提出了基于小波包分解的多尺度互相关时延估计方法用于管道故障点定位.首先对2路光电检测器采集到的管道沿线振动信号进行小波包分解和重构得到不同尺度数据,然后对2路信号的同一尺度数据做互相关运算,利用互相关时差定位和加权平均原理计算故障点位置,抑制了噪声引起的时延估计误差.现场实验数据表明,本文方法平均定位误差小于150 m,相对误差小于0.4%,最大定位误差不超过±400 m,定位均方差小于0.05,相对于传统直接互相关时延估计法,此方法可进一步降低时延估计的平均误差和均方差,显著提高定位精度和一致性.
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| 关 键 词： | 油气管道 分布式光纤传感器 小波包分解 多尺度分析 时延估计 |
A Location Method for Pipeline Based on Wavelet Packet Decomposition with Multi-Scale Cross-Correlation Analysis |
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| ZHANG Jing-chuan,ZENG Zhou-mo,ZHANG Zhao-wei,CHENG Xiang-li,ZHANG Xi-mo.A Location Method for Pipeline Based on Wavelet Packet Decomposition with Multi-Scale Cross-Correlation Analysis[J].Nanotechnology and Precision Engineering,2011,9(2):162-167. |
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| Authors: | ZHANG Jing-chuan ZENG Zhou-mo ZHANG Zhao-wei CHENG Xiang-li ZHANG Xi-mo |
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| Affiliation: | ZHANG Jing-chuan,ZENG Zhou-mo,ZHANG Zhao-wei,CHENG Xiang-li,ZHANG Xi-mo(State Key Laboratory of Precision Measurement Technology and Instruments,Tianjin University,Tianjin 300072,China) |
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| Abstract: | In order to solve the problem of low location precision with direct cross-correlation algorithm for time delay estimation,a multi-scale cross-correlation algorithm for time delay estimation based on wavelet packet decomposition was proposed for location of petroleum pipeline abnormal vibration events.The detection signals of abnormal events collected by the two photodetectors were made multi-scale analysis with wavelet packet decomposition and reconstruction methods.Then the sub signals in different frequen... |
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| Keywords: | petroleum pipeline distributed optical fiber sensor wavelet packet decomposition multi-scale analysis time delay estimation |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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