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通过对管道泄漏的数值计算,发现管道泄漏时管道上下游水力参数的变化规律不同于阀门启闭引起的水力参数的变化规律。基于此,将复杂的管道泄漏模型转化为容易识别的参数突变模型,提出了应用变点检测原理在线监测管道泄漏的方法,并将扩展的序列似然比检测方法应用于管道泄漏识别中。试验结果表明该方法能实时有效地识别管道泄漏。
Through the numerical calculation of pipeline leakage, it is found that the variation law of the hydraulic parameters in the upstream and downstream of the pipeline when the pipeline is leaking is different from that of the hydraulic parameters caused by the valve opening and closing. Based on this, the complex pipeline leakage model is transformed into a easily identifiable parameter mutation model. A method of on-line monitoring of pipeline leakage based on the principle of variable point detection is proposed. The extended sequence likelihood ratio detection method is applied to pipeline leakage identification. The experimental results show that this method can identify pipeline leakage in real time.