Development of an omni-directional shear-horizontal wave magnetostrictive patch transducer for the effective inspection of a ferromagnetic plate

효과적인 강자성체 평판구조물 검사를 위한 전 방향 전단파 자기변형 패치 트랜스듀서 개발

Omni-directional shear-horizontal magnetostrictive patch transducers have a disadvantage that magnetic flux leakage into the plate when it is installed on a ferromagnetic plate. The leakage produces poor transduction efficiency and unwanted wave mode excitation which should be avoided in guided wave inspections of large plate-like structures. In order to resolve these problems, we newly developed a method to reduce the leakage into the plate. In the method, the patch and the magnet are vertically lifted off and their optimal positions are determined by numerical simulations. Also, the verification of the developed method is successfully verified by experiments.