基于时频分析和改进差分进化的多点泄漏定位方法

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (1) : 39-45.

论文

郎宪明1,2,3，朱永强1，李金娜1，曹江涛1，李平1，宋华东3

作者信息 +

Multi-point leakage locating method based on TFA and improved DE

LANG Xianming1,2,3, ZHU Yongqiang1, LI Jinna1, CAO Jiangtao1, LI Ping1, SONG Huadong3

Author information +

文章历史 +

摘要

当管道同时发生多个泄漏点时，多个泄漏点的声波信号出现混叠，从而影响泄漏声信号的传播和衰减规律。在多点泄漏声波信号混叠的情况下，传统的泄漏定位方法无法对多个泄漏点进行有效定位。为此，提出了一种基于时频分析和改进差分进化的多点泄漏定位方法。由于变分模态分解(Variational Mode Decomposing，VMD)的分解模态个数对特征提取有影响，因此采用能量函数估计分解模态个数，从而对VMD改进。然后采用改进VMD对多点泄漏声波信号进行处理。另外，通过时频分析(Time-frequency Analysis，TFA)估计多个泄漏点数量，从而得到多点泄漏的定位函数。差分进化算法(Differential Evolution，DE)易陷入局部最优，在进化后期收敛速度较慢，采用粒子群优化算法(Particle Swarm Optimization Algorithm，PSO)提高DE的全局收敛速度，并通过改进的差分进化算法估计多个泄漏点的位置。在管道现场进行多点泄漏的模拟实验，实验结果表明所提方法能够准确地估计多点泄漏位置，泄漏定位的最小误差为18m。

Abstract

When multiple leaks occur at the same time, the influence of leak acoustic wave signals is superposed in the leak acoustic wave signal, which affects the propagation and attenuation rule of the transient acoustic signal. The traditional leak localization method is impossible to effectively locate the multiple leak signals under the condition of mixed signal. Thus, a localization method of multiple leaks based on time-frequency analysis of acoustic wave and improved differential evolution is proposed. Since the decomposition model number of Variational Mode Decomposing (VMD) affects the feature extraction, the energy function is used to improve VMD. The improved VMD is applied to acoustic wave analysis and processing. Additionally, the number of multiple leaks is extracted by Time-frequency Analysis (TFA). Then, the multiple leaks localization function is obtained. Differential Evolution (DE) is easy to fall into local optimum, and its convergence speed is slow in the later stage of evolution, Particle Swarm Optimization Algorithm (PSO) is used to improve the global convergence speed of DE, and the multiple leaks positions are calculated by improved differential evolution. By analyzing the acquired acoustic wave data of multiple leaks in experimental pipeline, the results show that the proposed method can accurately locate multiple leaks in pipeline, and the minimum error of leak localization is 18 m.

导出引用

郎宪明1,2,3，朱永强1，李金娜1，曹江涛1，李平1，宋华东3. 基于时频分析和改进差分进化的多点泄漏定位方法[J]. 振动与冲击, 2022, 41(1): 39-45

LANG Xianming1,2,3, ZHU Yongqiang1, LI Jinna1, CAO Jiangtao1, LI Ping1, SONG Huadong3. Multi-point leakage locating method based on TFA and improved DE[J]. Journal of Vibration and Shock, 2022, 41(1): 39-45

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