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Pipe system diagnosis and leak detection by unsteady-state tests. 2. Wavelet analysis

机译:通过非稳态测试进行管道系统诊断和泄漏检测。 2.小​​波分析

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As shown in Part 1, the analysis of a pressure signal in the frequency domain can give items of information for leak detection even though, moving from time to frequency domain, interesting information about the arrival time of pressure waves are lost. To overcome this limitation and to widen the applicability of transient-test based methodologies for leak detection, the wavelet transform of laboratory experimental data is used. Such data consist of pressure time histories acquired at one measurement section during transients in a single pipe system. The wavelet transform is used to detect local singularities in the pressure time history due to the presence of a leak. The discontinuity occurrence in time reveals the arrival time of the leak reflected pressure wave and is the basis for leak location.
机译:如第1部分中所示,即使从时域移动到频域,也会丢失有关压力波到达时间的有趣信息,但对频域中压力信号的分析可以提供用于泄漏检测的信息。为了克服此限制并扩大基于瞬态测试的方法在泄漏检测中的适用性,使用了实验室实验数据的小波变换。这样的数据由在单个管道系统中瞬变过程中在一个测量部分获得的压力时间历史组成。小波变换用于检测由于泄漏而导致的压力时间历程中的局部奇异点。时间上的不连续性揭示了泄漏反射压力波的到达时间,是泄漏定位的基础。

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