气体管道泄漏声发射单一非频散模态定位
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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

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TN911.7TH86

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国家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(cstc2015jcyjA40010)、重庆市教委科学技术研究项目(KJ1500423)、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


Leak location in gas pipelines by extraction of single nondispersive mode from leakageinduced acoustic emission signal
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1. Guangxi Autonomous Region Meteorological Technology Equipment Center, Nanning 530000, China; 2. Key Laboratory of Industrial Internet of Things & Networked Control, Ministry of Education, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

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    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,提出采用单一非频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频散模态导波的互谱。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,更准确计算出泄漏位置。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。

    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.

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杨丽丽,谢昊飞,李帅永,李伟雄,何明峰.气体管道泄漏声发射单一非频散模态定位[J].仪器仪表学报,2017,38(4):969-976

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  • 在线发布日期: 2017-07-19
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