在运营条件下对油气管道的裂纹损伤进行有效识别是实现油气管道健康监测的重要内容之一,实时探测识别油气管道的损伤有利于建立管道健康监测系统。本文利用压电阻抗技术,对油气管道裂纹损伤进行了识别试验。试验分四种工况,通过量测不同深度裂纹损伤的油气管道的压电阻抗谱,分析了油气管道裂纹损伤与压电阻抗谱变化的规律,并利用统计特征指标RMSD和MAPD进一步评估损伤。试验结果表明：损伤的发展会导致电导纳实部频谱曲线向左偏移,频谱曲线峰值频率减小；随着损伤程度的增大,RMSD和MAPD指标呈线性增长。由此实现了对油气管道裂纹损伤程度的有效判别。因此,压电阻抗技术可应用于油气管道的损伤识别,研究结果可为油气管道结构健康监测提供借鉴。%Effective identification of crack damage of oil and gas pipeline under operating conditions is one of the important contents of its health monitoring, real-time monitoring of the damage on oil and gas pipeline is the basic premise to establish pipeline health monitoring system. Based on the piezoelectric impedance technology, this paper experimentally investigated the oil and gas pipeline crack damage identification, in which the impedance spectra of the pipeline with different crack damage severity were measured under four damage conditions, and statistical damage indices RMSD and MAPD were used to study the relation between the pipeline damage and PZT impedance information. The experimental results demonstrate that with the development of pipeline damage, the real part of electrical admittance obviously shift leftward which decrease the resonance frequency of the peak value. In addition, RMSD and MAPD indices increase linearly. In this way, the severity of crack damage on the pipeline is determined. Therefore, the piezoelectric impedance technique can be applied to damage identification of oil and gas pipelines, the experimental results can provide reference for real-time health monitoring of oil and gas pipeline structures.
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