变模式分解在供水管道漏点定位中的应用研究

发布时间：2018-04-11 23:07

本文选题：信号处理 + 漏点定位　；参考：《电子器件》2017年04期

【摘要】：针对供水管道中泄漏声信号的非平稳特征,提出了一种基于变模式分解VMD(Variational Mode Decomposition)的漏点定位方法。算法首先利用VMD将传感器所采集的两路泄漏声信号按预设尺度自适应地分解为若干个固有模态函数,而后根据各模态函数与原始信号的相关系数选择分量重构信号,并达到消噪的目的。通过对消噪后的信号作互相关实现时延估计,最终实现对漏点的定位。实验结果表明:VMD分解方法可以在保留泄漏声信号本质特征的前提下,消除噪声对信号的干扰。较传统的EMD方法而言,其定位精度更高。
[Abstract]:Aiming at the non-stationary characteristics of leakage sound signal in water supply pipeline, a method of leak location based on variable mode decomposition (VMD(Variational Mode decomposition) is proposed.The algorithm firstly decomposes two leaky acoustic signals collected by the sensor into several inherent modal functions adaptively according to the preset scale by using VMD, and then selects components to reconstruct the signals according to the correlation coefficients between each modal function and the original signal.And achieve the purpose of noise elimination.The time delay estimation is realized by cross-correlation of the de-noised signal, and the location of the leak point is finally realized.The experimental results show that the VMD decomposition method can eliminate the noise interference on the premise of preserving the essential characteristics of the leaky acoustic signal.Compared with the traditional EMD method, its positioning accuracy is higher.
【作者单位】：南京信息职业技术学院电子信息学院;金陵科技学院电子信息工程学院;
【基金】：南京信息职业技术学院工程研发中心开放基金项目(KF20150105) 江苏省大学生实践创新项目(201613112016Y)
【分类号】：TN911.7;TP212.9

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