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实际供水管网的漏损和流量随机性均会导致管网水力分布的波动,水压监测中通过压差阈值界定两种状态,但传统阈值只能控制误报率,不能控制诊断误差。为降低漏损诊断误差,在监测目标明确的情况下,给出对应最小误差的诊断阈值,并将其应用于Lansey供水管网中。结果表明,在随机流量供水管网中,该阈值稳定性好,对应的漏损诊断精度高;由于得到的漏报率和误报率接近,实际管网漏损诊断中,可以采用该误报率的2倍作为漏损诊断误差。
The leakage of the actual water supply network and the randomness of the flow will lead to the fluctuation of the hydraulic distribution of the pipe network. The two thresholds are defined by the pressure difference threshold in the water pressure monitoring. However, the traditional threshold only controls the false alarm rate and can not control the diagnostic error. In order to reduce the diagnostic error of the leakage, the diagnostic threshold corresponding to the minimum error is given under the condition of clear monitoring target and applied to the Lansey water supply network. The results show that the stability of the threshold is good and the accuracy of the corresponding damage detection is high in the random flow water supply network. The false alarm rate can be used in the actual diagnosis of pipeline leakage 2 times the rate of error as a diagnostic error.