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本文对德国著名学者Isermann提出的检测液体管道小泄漏的定位公式加以修正。修正后的方法考虑了液体管道发生泄漏后对泵后压力的影响。因此,它适用于各种特性的泵所组成的液体管道系统的泄漏检测和定位,扩大了 Ise-rmann 提出的液体管道小泄漏定位的应用范围,提高了估计泄漏位置的精度。文中应用互相关技术对量测到的信号进行处理,提高了泄漏检测灵敏度,同时采用递推算法进行在线检测和定位。对一条长91.6米,内径8毫米的液体(煤油)管道的泄漏实验表明,修正后的方法估计泄漏位置平均误差从原来的10%左右下降到3%。本方法能检测出1%的泄漏量。
In this paper, the localization formula of small leakage in liquid pipeline proposed by Isermann, a famous German scholar, is revised. The revised method takes into account the effect of pressure on the pump after a leak in the liquid pipe. Therefore, it is suitable for the leak detection and positioning of the liquid pipe system composed of various characteristics of the pump, expanding the scope of application of the small leak positioning of the liquid pipe proposed by Ise-rmann, and improving the accuracy of estimating the position of the leak. In this paper, the cross-correlation technique is used to process the measured signals, which improves the sensitivity of leakage detection and recursive algorithm for on-line detection and location. A leak test on a liquid (kerosene) pipe measuring 91.6 meters in length and 8 millimeters in inner diameter revealed that the revised method estimated the average error of the leak location to drop from about 10% to 3%. The method can detect 1% of the leakage.