When there is a leak point in the pipeline, the pressure is fallen and the negative pressure wave occurs at once.
当管道某处突然发生泄漏时，泄漏处将出现瞬态压力突降，形成一个负压波，并以一定的速度向管道上、下游两端传播。
Several leak diagnosis methods such as instantaneous negative pressure wave, flow-lack, and hybrid diagnostic method were used.
采用了瞬态负压波法、流量输差法和压力流量综合法等多种泄漏诊断方法。
This article narrated the application of the negative pressure wave method in the leak detecting system of transporting-oil pipe.
主要讲述了负压波理论在输油管道泄漏监测系统的具体应用情况。
Finally, the dissertation brings forward the collectivity project of the negative pressure wave leak detecting system based on data transfer of wireless spread, spectrum network.
最后，结合课题提出了基于无线扩频网络数据传输的负压波法泄漏检测系统的总体方案。
Taking the negative pressure wave produced by pipeline leakage as a transient signal, the multi scale wavelet transform can be utilized to identify the pipeline leakage signal in local.
利用多尺度小波变换，把管道泄漏产生的负压波信号作为瞬态信号，来识别管道的局部泄漏特征。
The data handling to the whole system is taking a decisive factor in the negative pressure wave law leakage checkout system, and can influence the accuracy and the precision of this system.
在负压波法泄漏检测系统中，数据处理对整个系统起着决定性作用，影响着对泄漏事件的判别准确性和泄漏点定位的精度。
Based on the negative pressure wave, the correlation analytic method is used for leakage detection and location of pipeline, the algorithm of the leakage location is also introduced in the paper.
阐述了依据负压波法，应用相关分析法进行管道泄漏检测的原理，给出了漏点定位的算法。
The velocity change of instantaneous negative pressure wave along the pipeline is analyzed when hot oil is transported. Two searching methods are applied to locate leakage through numerical integral.
分析了热油输送管道沿程瞬态负压波传播速度的变化，采取两种搜索方法数值积分求解泄漏点位置。
The velocity change of instantaneous negative pressure wave along the pipeline is analyzed when hot oil is transported. Two searching methods are applied to locate leakage through numerical integral.
分析了热油输送管道沿程瞬态负压波传播速度的变化，采取两种搜索方法数值积分求解泄漏点位置。
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