基于声波衰减模型对液体管道泄漏位置的极大似然估计

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (15) : 238-245.

论文

池招招1，蒋军成1,2，刁旭1，倪磊1，王志荣1，沈国栋1，郝永梅2

作者信息 +

Maximum likelihood estimation for leakage location of liquid pipeline based on acoustic attenuation model

CHI Zhaozhao1, JIANG Juncheng1,2, DIAO Xu1, NI Lei1, WANG Zhirong1, SHEN Guodong1, HAO Yongmei2#br#

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文章历史 +

摘要

传统声波衰减定位模型在实现定位前需要进行管道运行参数的确定以便计算衰减模型中涉及的参数。针对该问题提出一种新的传感器布置方式，即在泄漏点上下游均放置两个传感器，通过上（下）游两传感器之间实验信号幅值比值获取衰减参数。通过变分模态分解（variational mode decomposition，VMD）这一信号处理方法对实验信号进行降噪，研究不同泄漏口径（3,6,8,10,12,15,20和27 mm）以及不同探测距离对泄漏信号的影响，最终借助极大似然估计（maximum likelihood estimation, MLE）法在衰减模型基础上进行泄漏定位。结果表明在不同泄漏口径以及不同传感器探测位置下，该方法可对泄漏进行有效定位，定位效果好于时差法且误差在15%以内。此外，敲击实验定位误差小于7%，佐证了该方法的有效性。

Abstract

The traditional acoustic attenuation positioning model needs determining pipeline operation parameters before positioning so as to calculate parameters involved in the attenuation model. Here, to solve this problem, a new sensor arrangement scheme was proposed, i.e., two sensors being placed in upstream and downstream of leakage point, and attenuation parameters being obtained with ratio values of experimental signal amplitudes between upstream and downstream sensors. The signal processing method of variational mode decomposition (VMD) was used to denoise experimental signals, and effects of different leakage diameters of 3, 6, 8, 10, 12, 15, 20, 27 mm and different detection distances on leakage signals were studied. Finally, MLE was used to do leakage positioning based on the attenuation model. The results showed that the proposed method can effectively locate leakages under conditions of different leakage calibers and different sensor positions; its positioning effect is better than that of the time difference method, and its error is within the range of 0~15%; the positioning error of knocking experiments is less than 7% to prove the effectiveness of the proposed method.

导出引用

池招招，蒋军成，刁旭，倪磊，王志荣，沈国栋，郝永梅. 基于声波衰减模型对液体管道泄漏位置的极大似然估计[J]. 振动与冲击, 2021, 40(15): 238-245

CHI Zhaozhao, JIANG Juncheng, DIAO Xu, NI Lei, WANG Zhirong, SHEN Guodong, HAO Yongmei. Maximum likelihood estimation for leakage location of liquid pipeline based on acoustic attenuation model[J]. Journal of Vibration and Shock, 2021, 40(15): 238-245

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