小波变换在管道泄漏点定位中的应用
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摘要
当管道发生泄漏时 ,泄漏诱发的负压波传播到管道上下游监测点时会使该点压力信号幅值产生瞬态下降 ,利用小波变换模极大值检测压力信号的突变点 ,从而计算出管道泄漏诱发的负压波传播到上下游监测点的时间差。在MATLAB6 1软件环境下 ,以某次实验数据为例进行管道泄漏点定位研究。在计算过程中小波基函数选取为Haar小波 ,尺度水平为 6 ,计算结果表明该方法可以计算出管道泄漏点处诱发的负压波传播到管道上游监测点的时间差 ,从而为准确定位泄漏点提供了基础
When there is a leak point in the pipeline,a negative pressure caused by leak will transmit in pipeline and make the pressure drop at once.The time when pressure drop occurs is called signal's oddity point.For wavelet algorithms model the max value always corresponding the oddity point,the different time negative pressure transmit between first inspection point and last inspection point can be calculated by wavelet algorithm.The experiment data was used to take as example at the software enviroment of MATLAB6 1.In the course of calculation,Harr wavelet was scale selected as base wavelet and scale level was 6.The result indicates that the different time can be calculated by this way.It is make a base for the accurate leak detection and find leak point precisely.
When there is a leak point in the pipeline,a negative pressure caused by leak will transmit in pipeline and make the pressure drop at once.The time when pressure drop occurs is called signal's oddity point.For wavelet algorithms model the max value always corresponding the oddity point,the different time negative pressure transmit between first inspection point and last inspection point can be calculated by wavelet algorithm.The experiment data was used to take as example at the software enviroment of MATLAB6 1.In the course of calculation,Harr wavelet was scale selected as base wavelet and scale level was 6.The result indicates that the different time can be calculated by this way.It is make a base for the accurate leak detection and find leak point precisely.
引文
[1] 张布悦,王桂增,刘吉东,等.输油管线泄漏检测和定位技术综述.上海海运学院学报,2001,22(3):13-16;21.
[2] 靳世久,王立宁,李健.原油管道漏点定位技术.石油学报,1998,19(3):93-97.
[3] 彭玉华.小波变换与工程应用.北京:教育科学出版社,1999.
[4] 张晓春.小波变换在奇异信号检测中的应用.传感器技术,2002,21(3):33-35.
[5] 高峰,曲建岭,周玉平.不同小波基下滤波性能之比较.仪器仪表学报,2002,23(4):437-440.
[6] 胡昌华.基于MATLAB的系统分析与设计———小波分析.西安:西安电子科技大学出版社,1999.
[7] 郑治真.小波变换及MATLAB工具的应用.北京:地震出版社,2001
[2] 靳世久,王立宁,李健.原油管道漏点定位技术.石油学报,1998,19(3):93-97.
[3] 彭玉华.小波变换与工程应用.北京:教育科学出版社,1999.
[4] 张晓春.小波变换在奇异信号检测中的应用.传感器技术,2002,21(3):33-35.
[5] 高峰,曲建岭,周玉平.不同小波基下滤波性能之比较.仪器仪表学报,2002,23(4):437-440.
[6] 胡昌华.基于MATLAB的系统分析与设计———小波分析.西安:西安电子科技大学出版社,1999.
[7] 郑治真.小波变换及MATLAB工具的应用.北京:地震出版社,2001
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