Abstract:In order to solve the problem that the curvature radius of the concave and convex testing surfaces of a curved surface component influences the resolution/sensitivity and positioning/quantitative deviation of the fault detection of an angled shearvertical (SV) wave electromagnetic acoustic transducer (EMAT), a finite element model for the radiated sound field of an angled SV wave EMAT based on curved testing surfaces (concave and convex surfaces) is established. The influences of the number of the turns of the meanderline coil and the curvature radius on the main lobe peak, main lobe width, maintosidelobe ratio and incident angle of angled SV wave are investigated, and the simulated results are verified by experiments. The results show that when the numbers of the turns of the meanderline coil are the same, the SV wave amplitude of the convex testing surface is improved by more than 348% and the main lobe width is reduced by 438% compared with those of the plane testing surface. When the number of the turns of the meanderline coil increases from 10 to 30, the SV wave amplitude of the convex testing surface is improved by 423% and the main lobe width is reduced by 436%. The sound field characteristic of the convex testing surface is better than those of the plane and concave testing surfaces. The curvature radius of the convex testing surface has a significant influence on the main lobe peak, main lobe width and the maintosidelobe ratio of angled SV wave. .txt