摘要
为提高声波法在复杂噪声环境下进行直埋供热管道泄漏定位的准确性,本文提出了基于能量分析重构有效模态分量的供热管道泄漏定位方法,即采用变分模态分解(VMD)将检测信号自适应地分解为一组本征模态函数(IMF),识别、提取有泄漏特征的有效模态分量,并通过能量占比分析完成信号加权重构。泄漏实验和工程实测表明:常规VMD泄漏定位方法与本文方法的平均定位偏差分别为1.57、0.51 m,相对定位偏差分别为8.42%、2.75%,采用本文方法定位准确性提高67.34%;工程实测中,常规VMD方法未能发现管道泄漏位置,本文方法确定的泄漏位置定位偏差为1.78 m;本文方法可抑制有效模态分量中的残余噪声,降低噪声成分对泄漏定位的影响,提高复杂噪声环境下供热管道泄漏定位精度。
To improve the accuracy of acoustic wave method for the directly buried heating pipeline leakage location in the complex noise environments,this paper proposes a leakage location method for heating pipelines based on energy analysis to reconstruct the effective modal components,that is,the variational mode decomposition(VMD)is used to adaptively decompose the detection signals into a group of intrinsic mode functions(IMF),identify and extract the effective modal components with leakage features,and complete the signal weighted reconstruction through energy proportion analysis.The leakage tests and engineering measurements show that the average location deviation by the conventional VMD leakage location method is 1.57 m while that of the proposed method is 0.51 m,along with their relative deviations of 8.42%and 2.75%,respectively.The leakage location accuracy of the proposed method is improved by 67.34%.In the engineering measurements,the conventional VMD method fails to find the leakage location of the pipeline,while the proposed method finds the leakage location and its location deviation is 1.78 m different from the actual location.The proposed method can effectively suppress the residual noises in the effective modal components,reduce the influence of noise components on the leakage location,and improve the leakage location accuracy of heating pipeline in the complex noise environments.
作者
高茹霞
李成
王随林
穆连波
鲁军辉
王海鸿
李智
刘建军
Gao Ruxia;Li Cheng;Wang Suilin;Mu Lianbo;Lu Junhui;Wang Haihong;Li Zhi;Liu Jianjun(Beijing University of Civil Engineering and Architecture,Beijing;Beijing District Heating Group Co.,Ltd.,Beijing;Beijing Thermal Equipment Manufacturing Co.,Ltd.,Beijing)
出处
《暖通空调》
2024年第4期55-61,135,共8页
Heating Ventilating & Air Conditioning
基金
北京市热力集团合作项目(编号:KY191007)
北京学者计划资助项目(编号:2015NO.022)
北京市教育委员会科研计划项目(编号:KM202310016006)。
关键词
声波法
供热管道
变分模态分解
能量分析
信号重构
信号降噪
泄漏定位
acoustic wave method
heating pipeline
variational mode decomposition(VMD)
energy analysis
signal reconstruction
signal denoising
leakage location
