Abstract
According to the principle of electromagnetic Acoustic transducer (EMAT), the propagation characteristics of electromagnetic ultrasonic shear wave in pipeline are analyzed by using the finite element analysis software COMSOL. Based on the study of the acoustic field characteristics of the ultrasonic shear wave, a finite element model with bubble defects was established, and the ultrasonic response characteristics of the inner and outer walls of the pipe with defects were simulated and analyzed, and compared with those of the pipe without defects. Then the simulation analysis of the defects of different sizes and different positions is carried out, and the relationship between the size, position, defect echo, defect transmission wave and time is obtained, which lays a foundation for the quantitative and location monitoring of pipeline bubble defects. The possibility of electromagnetic ultrasonic body wave in oil pipeline flaw detection is verified.
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