유한요소 모델 개선기법을 이용한 손상추정

• Published in: Han-guk haeyang gonghak hoeji (Online) Vol. 26; no. 5; pp. 11 - 17
• Main Authors: 민천홍(Cheon-Hong Min), 최종수(Jong-Su Choi), 홍섭(Sup Hong), 김형우(Hyung-Woo Kim), 여태경(Tae-Kyeong Yeu)
• Format: Journal Article
• Language: Korean
• Published: 한국해양공학회 2012
• Subjects: 해양공학; Riser 라이저; FE model updating 유한요소 모델 개선; Zero Frequency 제로주파수; Damage detection 손상추정
• ISSN: 1225-0767; 2287-6715

In this study, a damage detection method that uses sensitivity-based finite (FE) element model updating with the natural frequency and zero frequency was proposed. The stiffness matrix for a structure was modified using the sensitivity-based FE model updating method. A sensitivity analysis was used to update the FE model, and the natural frequencies and zero frequencies were considered as target parameters to supplement the information on the vibration characteristics. The locations and values of the damages were estimated from the modified stiffness matrix. Several numerical examples were considered to verify the performance of the proposed method.