基于序贯检验的管道泄漏检测方法

利用序贯概率比检验法检测油气管道泄漏是一种较新的方法.针对原始压力信号噪声的非高斯性,采用卡尔曼滤波器进行预处理,提高了序贯法判断泄漏的准确性.分析了传统压力梯度法的不足,借鉴负压波定位中的时间差法定位泄漏点,提高了定位的精度.实验结果表明,这种管道泄漏检测方法值得推广.

Detection method for pipeline leakage based on sequential probability ratio test

The sequential probability ratio test (SPRT) can be applied only to the case that there is only white Guass noise in the pressure signal. Kalman filter was used to pretreatment of pressure signal to obtain the real data similar to Guass distribution. Then SPRT was used to determine leakage of pipeline. For improving the detecting accuracy of leakage positions on pipeline with SPRT, a new method based on time diversity was proposed. The deficiencies of existing pressure gradient localization method were analyzed. The experimental results proved the superiority of the proposed method.