【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。更多还原

【Abstract】 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.更多还原