气体管道泄漏声发射单一非频散模态定位

发布时间：2018-04-02 08:46

本文选题：泄漏定位　切入点：气体管道　出处：《仪器仪表学报》2017年04期

【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]:Aiming at the problem that the multi-mode and dispersion characteristics of acoustic emission signals of gas pipeline lead to large cross-correlation leakage location error, a single non-dispersive mode extraction method for gas pipeline leakage acoustic emission location is proposed.By windowing the cross-spectrum of the detection signal and determining the window parameters according to the modal wavenumber, the cross-spectrum of the single non-dispersive mode guided wave of the leaky acoustic emission signal can be obtained.The cross-correlation function and the time delay estimation of the single non-dispersive mode signal in the leaky acoustic emission are obtained by Fourier inverse transformation of the cross-spectrum of the single non-dispersive mode guided wave, and the single non-dispersive mode sound velocity can be adopted.More accurate calculation of leakage location.Compared with the undecomposed acoustic emission signal, the correlation of the single non-dispersive mode signal of acoustic emission is enhanced, and the sound velocity is more accurate than that of the undecomposed acoustic emission signal.The relative error of positioning is reduced by more than 7% on average.It is shown that the validity of leak detection can be improved and the location error can be reduced by extracting a single non-dispersive mode component of the leakage signal cross-spectrum for time delay estimation.
【作者单位】：广西区气象技术装备中心;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;
【基金】：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(cstc2015jcyj A40010) 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
【分类号】：TE973.6

【相似文献】