점탄성층이 부분적으로 삽입된 샌드위치보의 횡진동 특성

Abstract

점탄성층이 전체 혹은 부분적으로 삽입된 샌드위치형상의 복합구조물에서 부분층댐퍼의 길이 및 두께, 보의 두께 변화가 계의 공잔주파수와 손실계수에 미치는 효과를 연구하였다. 유한요소 횡진동해석과 실험을 병행하였다. The flexural vibration of a sandwich beam with partially inserted viscoelastic layer has been studied using the finite element analysis in combination with an experiment. Effects of length and thickness of partial viscoelastic layers on system loss factor and resonant frequency were considerably large. The thicker the viscoelastic layer in a sandwich beam, the larger the system loss factor in Mode 1 as compared with that in Mode 2. The loss factor increased almost linearly with increasing the length of partial viscoelastic layer. Effects of thickness of beams were also considered.