Modal Damping of the Flexural Vibration of a Sandwich Beam with Partially Inserted Viscoelastic Layer

점탄성층이 부분적으로 삽입된 샌드위치보의 횡진동모드별 감쇠특성

Modal damping characteristics of the flexural vibration of a sandwich beam with paaially inserted viscoelastic layer have been quantitatively studied using the finite element analysis in combination with an experiment. Antisymmetric mode shapes of the flexural vibration were visualized by the holographic interferometry and agreed with those calculated by the finite element simulation. Effects of the length and thickness of partial viscoelastic layers on the system loss factor($\mu$) and resonant frequency($\omega$) were considerably latge at both symmetric and antisymmetric modes of the sandwich beam.