Damage Detection Using Finite Element Model Updating

doi:2012.26.5.11

J. Ocean Eng. Technol. > Volume 26(5); 2012 > Article

J. Ocean Eng. Technol. 2012;26(5):11-17.
DOI: https://doi.org/10.5574/KSOE.2012.26.5.011

Min Cheon-Hong,Choi Jong-Su,Hong Sup,Kim Hyung-Woo,Yeu Tae-Kyeong

Ocean System Engineering Research Division Maritime and Ocean Engineering Research Institute Korea Institute of Ocean Science and Technology,Ocean System Engineering Research Division Maritime and Ocean Engineering Research Institute Korea Institute o

유한요소 모델 개선기법을 이용한 손상추정

민천홍,최종수,홍섭,김형우,여태경

한국해양과학기술원 선박해양플랜트연구소 해양시스템연구부,한국해양과학기술원 선박해양플랜트연구소 해양시스템연구부,한국해양과학기술원 선박해양플랜트연구소 해양시스템연구부,한국해양과학기술원 선박해양플랜트연구소 해양시스템연구부,한국해양과학기술원 선박해양플랜트연구소 해양시스템연구부

Keywords: FE model updating, Damage detection, Zero frequency, Riser

핵심용어: 유한요소 모델 개선, 손상추정, 제로주파수, 라이저

Abstract

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.