Noncontact Modal Testing Method Using Magnetostriction Effects

마그네토스트릭션 효과를 이용한 비접촉 모달 테스팅 기법

In this work, we propose to employ magnetostrictive sensors to develop a new non-contacting modal testing method. Specific applications are made in the modal testing of a beam in bending. The role of bias magnetic fields in measuring bending waves is addressed and an approximate analysis to explain the principle to measure bending signals is carried out. The measured modal data by the present method agree well with those by conventional methods using accelerometers.