基于小波变换的管道泄漏点定位研究
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摘要
针对管道泄漏诱发的负压波传播到管道泄漏上下游监测点时会使该点压力信号幅值产生瞬态下降这一现象,提出对管道监测点采集的压力信号进行小波变换,并根据小波变换模极大值对应着信号突变点这一理论,计算出负压波传播到管道上下游监测点的时间差。在MAT鄄LAB6.1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下游监测点的时间差,从而为准确定位泄漏点提供了基础。
When the negative pressure wave induced by pipe leakage propagates to two monitoring points of upstream and downstream ,the pressure amplitudes at these points will decrease instantaneously.Based on this phenomenon ,a wavelet transform for the pressure signals acquired from the monitoring points is provided ,and the propagating time difference between the two monitoring points is calculated according to the theory that the extreme modulus value of wavelet transform responds to the sudden change of the pressure signal.The leakage locating study is carried out with the practical experiment data by using MATLAB6.1software.The Haar wavelet is selected as the base wavelet function and the level is6.The calculated results indicate that the time difference can be calculated by this way.It of-fers a base to accurately determine the leakage location.
When the negative pressure wave induced by pipe leakage propagates to two monitoring points of upstream and downstream ,the pressure amplitudes at these points will decrease instantaneously.Based on this phenomenon ,a wavelet transform for the pressure signals acquired from the monitoring points is provided ,and the propagating time difference between the two monitoring points is calculated according to the theory that the extreme modulus value of wavelet transform responds to the sudden change of the pressure signal.The leakage locating study is carried out with the practical experiment data by using MATLAB6.1software.The Haar wavelet is selected as the base wavelet function and the level is6.The calculated results indicate that the time difference can be calculated by this way.It of-fers a base to accurately determine the leakage location.
引文
[1]周诗岽,吴志敏,吴明.输油管道泄漏检测技术综述眼J演.石油工程建设.2003,29穴3雪:6-10.
[2]周诗岽,杨惠达,吴明.管道泄漏数学模型及测试技术眼J演.测试技术学报.2002(A)押85-90.
[3]彭玉华.小波变换与工程应用眼M演.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眼J演.传感器技术.2002熏21穴3雪.33-35.
[5]高峰,曲建岭,周玉平.不同小波基下滤波性能之比较眼J演.仪器仪表学报.2002熏23穴4雪押437-440.
[6]胡昌华.基于MATLAB的系统分析与设计———小波分析眼M演.陕西:西安电子科技大学出版社熏1999.
[7]郑治真.小波变换及MATLAB工具的应用眼M演.北京:地震出版社熏2001.
[2]周诗岽,杨惠达,吴明.管道泄漏数学模型及测试技术眼J演.测试技术学报.2002(A)押85-90.
[3]彭玉华.小波变换与工程应用眼M演.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眼J演.传感器技术.2002熏21穴3雪.33-35.
[5]高峰,曲建岭,周玉平.不同小波基下滤波性能之比较眼J演.仪器仪表学报.2002熏23穴4雪押437-440.
[6]胡昌华.基于MATLAB的系统分析与设计———小波分析眼M演.陕西:西安电子科技大学出版社熏1999.
[7]郑治真.小波变换及MATLAB工具的应用眼M演.北京:地震出版社熏2001.
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