文章摘要
杨进,文玉梅,李平.自来水铸铁管道泄漏声信号频率特征研究[J].,2006,25(1):30-37
自来水铸铁管道泄漏声信号频率特征研究
Study on the frequency feature of acoustic leak signal in cast iron water distribution pipes
  
中文摘要:
      针对基于声发射技术的自来水管网泄漏检测定位方法,研究因泄漏而形成的声信号频率分布及不同泄漏量对频率分布的影响。实际泄漏检测时,通常采用互相关法估计泄漏信号到达不同传感器间的时间延迟实现漏点定位,因此,借助互相关分析法研究了管道的不同口径及泄漏信号传播距离对泄漏信号频率分布的影响。同时,泄漏声信号的传播不可避免要经过管道间的接口,因此分析了两种管道接口对信号频率成分的影响。进而为设计合理的管道泄漏检测过程提供依据,并为泄漏声信号形成及多种因素对泄漏声信号特征产生影响的机制研究奠定基础。
英文摘要:
      This paper investigates the frequency content of the leak signal in cast iron pipelines and the variation of the frequency content with leak rate. In order to pinpoint the location of suspected leak, the cross-correlation method is generally used, to estimate the time delay between two sensors which are positioned on two sides of the suspected leak position. The cross-correlation method has been adopted to study the spectra of leak signals in pipes of several sizes and at different propagation distances. The influence of pipe joint on the frequency content is also analyzed. The information related to the leak acoustic signal will help in the designing of appropriate procedures, and prompt the study in the generation mechanism and other characteristics of the leak signal.
DOI:10.11684/j.issn.1000-310X.2006.01.008
中文关键词: 泄漏检测  声发射技术  声信号  频率特征
英文关键词: Leak detection  Acoustic emission technique  Acoustic signal  Frequency feature
基金项目:
作者单位
杨进 重庆大学光电工程学院 重庆 400030 
文玉梅 重庆大学光电工程学院 重庆 400030 
李平 重庆大学光电工程学院 重庆 400030 
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