Identification of a Nonproportional Damping Matrix Using the Finite Element Model Updating

doi:2012.26.4.86

J. Ocean Eng. Technol. > Volume 26(4); 2012 > Article

J. Ocean Eng. Technol. 2012;26(4):86-91.
DOI: https://doi.org/10.5574/KSOE.2012.26.4.086

Min Cheon-Hong,Kim Hyung-Woo,Lee Chang-Ho,Hong Sup,Choi Jong-Su,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 비비례 감쇠행렬 추정

민천홍,김형우,이창호,홍섭,최종수,여태경

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

Keywords: Nonproportional damping matrix, Identification of damping matrices, FE model updating, Zero frequency

핵심용어: 비비례 감쇠행렬, 감쇠행렬 추정, 유한요소 모델 개선, 제로주파수

Abstract

A new identification method for a nonproportional damping matrix using the finite element (FE) model updating technique is proposed. Mass and stiffness matrices of the undamped system are identified by FE model updating method. Sensitivity analysis is used to update the FE model, and zero frequencies are considered as design parameters to supplement the information of vibration characteristics. The nonproportional damping matrix is identified through the proposed method. A numerical example is considered to verify the performance of the proposed method. As a result, the damping matrix of the nonproportional system is estimated accurately.