Quantitative Assessment of Pipeline Damage Based on Electromagnetic Ultrasonic Guided Waves
As a tool of energy transportation,pipeline will be scoured by the internal transportation medium and corroded by the external environment,resulting in strength loss and damage.Considering the limitations of quantitative research on irregular defects,and based on the common types of corrosion defects in pipelines,cor-rosion defects are roughly divided into three types with different geometric boundaries:groove,crescent,and circle.Establishing a 3D model of electromagnetic force multi-physical field coupling for pipeline defect detec-tion based on electromagnetic ultrasonic L(0,2)mode guided waves using COMSOL software,and the ultrason-ic propagation process and received signal characteristics under different types of defects are obtained.Accord-ing to the simulation results,the quantitative relationship between reflection coefficient and geometric parame-ters of defects are fitted by using L(0,2)guided waves and its mode conversion F(1,3)signal,and verified by experiments.The results show that when the defect shape is groove,circle and crescent,the function relation between the defect reflection coefficient and the section loss rate is quadratic,logarithmic and exponential,re-spectively.And the average absolute percentage error of each quantization model is 2.67％,1.79％and 7.91％,respectively.
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