TY - JOUR
T1 - An improved analytical model of the magnetostriction-based EMAT of SH0 mode guided wave in a ferromagnetic plate
AU - Zhang, Xiaodong
AU - Liu, Xiucheng
AU - Wu, Bin
AU - He, Cunfu
AU - Uchimoto, Tetsuya
AU - Takagi, Toshiyuki
N1 - Funding Information:
This study was supported by the National Key R&D Program of China (2018YFF01012300), National Natural Science Foundation of China (Project Nos. 11527801), Beijing Nova Program of Science and Technology under grant Nos. Z191100001119044 and International Program for Graduate Students of Beijing University of Technology.
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/12
Y1 - 2020/12
N2 - The accuracy of electro-acoustic energy transfer efficiency (EAETE) model directly determines the optimization results of an electromagnetic acoustic transducer (EMAT). In this study, the EMAT model of SH0 mode generation based on magnetostriction mechanism is re-examined. In the existing magnetostriction-based EMAT (MEMAT) analytical model, an approximate method of dynamic magnetic field was employed. Thus the effects of the tested ferromagnetic materials on the dynamic magnetic field in the air is ignored and the boundary condition between air and material is not exact. As a result, the calculated dynamic magnetic field inside the tested ferromagnetic materials is incorrect, thus leading to the calculation errors of magnetostriction body force and the final EAETE of MEMAT. The rigorous analytical solutions for calculating the dynamic magnetic field are derived based on Maxwell equations and boundary conditions in this study. The prediction results of improved analytical model were consistent with previously reported experimental results. Compared with existing analytical models, the improved model showed the higher prediction accuracy of several parameters, including dynamic magnetic field, magnetostriction force and the EAETE.
AB - The accuracy of electro-acoustic energy transfer efficiency (EAETE) model directly determines the optimization results of an electromagnetic acoustic transducer (EMAT). In this study, the EMAT model of SH0 mode generation based on magnetostriction mechanism is re-examined. In the existing magnetostriction-based EMAT (MEMAT) analytical model, an approximate method of dynamic magnetic field was employed. Thus the effects of the tested ferromagnetic materials on the dynamic magnetic field in the air is ignored and the boundary condition between air and material is not exact. As a result, the calculated dynamic magnetic field inside the tested ferromagnetic materials is incorrect, thus leading to the calculation errors of magnetostriction body force and the final EAETE of MEMAT. The rigorous analytical solutions for calculating the dynamic magnetic field are derived based on Maxwell equations and boundary conditions in this study. The prediction results of improved analytical model were consistent with previously reported experimental results. Compared with existing analytical models, the improved model showed the higher prediction accuracy of several parameters, including dynamic magnetic field, magnetostriction force and the EAETE.
KW - Analytical model
KW - Electro-acoustic energy transfer efficiency
KW - Magnetostriction-based EMAT
KW - SH mode guided wave
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U2 - 10.1016/j.ultras.2020.106213
DO - 10.1016/j.ultras.2020.106213
M3 - Article
C2 - 32615364
AN - SCOPUS:85086985472
SN - 0041-624X
VL - 108
JO - Ultrasonics
JF - Ultrasonics
M1 - 106213
ER -