Aiming at the problem that direct cross-correlation method for time delay estimation in the pipeline abnormal vibration events passive positioning is easily affected by the noise, a new method based on third-order cumulant and adaptive filter delay estimation for locating the pipeline vibration is put forward. The abnormal vibration signals are processed using third-order self-and cross-cumulant estimation, so the related Gaussian noise and symmetrical distribution noise can be suppressed. The adaptive filter is adopted to estimate the time delay of third-order Self-Cumulation and Cross-Cumulation, which can suppress the non-Gaussian correlated noise even without the prior knowledge. The field test proved that, this method can accurately locate the pipeline abnormal vibration events, suppress the noise commendably, and improve the performance of time delay estimation. Compared with the direct cross-correlation time delay estimation method, the relative positioning error reduces from 2.7% to 0.6%, positioning consistency increases three times, and the average positioning accuracy is up to 14m.
Feng Hao;Jin Shi-jiu;Zeng Zhou-mo;An Yang;Zhang xi-mo.
A Location Method for Pipeline based on third-order cumulant and adaptive filter time delay estimation[J]. Journal of Vibration and Shock, 2011, 30(9): 207-210
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