Numerical modelling of unilateral point-focusing electromagnetic acoustic transducer with experimental validation

Sun, Hongyu; Wang, Shen; Huang, Songling; Wang, Qing; Zhao, Wei

Abstract

Electromagnetic ultrasonic testing, based on the propagation characteristics of the ultrasonic wave in the medium, is an effective technique for defect detection. The structural of the electromagnetic acoustic transducer (EMAT) determines the detection effect, which should be reasonably designed. We propose an improved unilateral point-focusing EMAT structure with curved coils in this manuscript. The 3D model of the designed EMAT is numerically simulated utilizing the finite element method, and the bilateral point-focusing EMAT is also studied for comparison. The simulation results of the magnetic field intensity and the distributions of the displacement are shown in the manuscript, which prove the effectiveness of the improved unilateral point-focusing EMAT. Five impact parameters such as aperture angle, focal position, excitation current, lift-off distance, and coil winding number are investigated in detail. We verify the calculation results of the aperture angle and excitation current by the experiments. The conclusion shows that the focusing intensity of the improved unilateral point-focusing EMAT is relatively higher, and other factors also have a significant effect on the focal intensity.

Citation

Sun, H., Wang, S., Huang, S., Wang, Q., & Zhao, W. (2020). Numerical modelling of unilateral point-focusing electromagnetic acoustic transducer with experimental validation. International Journal of Applied Electromagnetics and Mechanics, 62(4), 645-662. https://doi.org/10.3233/jae-190071

• Journal Article Type: Article
• Online Publication Date: Apr 13, 2020
• Publication Date: 2020
• Deposit Date: May 28, 2020
• Publicly Available Date: May 28, 2020
• Journal: International Journal of Applied Electromagnetics and Mechanics
• Print ISSN: 1383-5416
• Electronic ISSN: 1875-8800
• Publisher: IOS Press
• Peer Reviewed: Peer Reviewed
• Volume: 62
• Issue: 4
• Pages: 645-662
• DOI: https://doi.org/10.3233/jae-190071
• Public URL: https://durham-repository.worktribe.com/output/1269760