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철근콘크리트 실험체의 시스템 식별과 유한요소 모델 수정
김학진(Kim, H.J.),유은종(Yu, E.J.),김호근(Kim, H.G.),장극관(Chang, K.K.),이상현(Lee, S.H.),조승호(Cho, S.H.),정란(Chung, L.) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.7
This paper focused on the application of finite element model updating technique to evaluate the structural properties of the reinforced concrete specimen using the data collected from shaking table tests. The specimen was subjected to six El Centre (NS, 1942) ground motion histories with different peak ground acceleration (PGA) ranging from 0.06 g to 0.50 g. For model updating, flexural stiffness values of structural members (walls and slabs) were chosen as the updating parameters so that the converged results have direct physical interpretations. Initial values for finite element model were determined from the member dimensions and material properties. Frequency response functions (i.e. transfer functions), natural frequencies and mode shapes were obtained using the acceleration measurement at each floor and given ground acceleration history. The weighting factors were used to account for the relative confidence in different types of Inputs for updating (j.e. transfer function and natural frequencies) The constraints based on upper/lower bound of parameters and sensitivity-based constraints were implemented to the updating procedure in this study using standard bounded variable least-squares(BVLS) method. The veracity of the updated finite element model was investigated by comparing the predicted and measured responses. The results indicated that the updated model replicates the dynamic behavior of the specimens reasonably well. At each stage of shaking, severity of damage that results from cracking of the reinforced concrete member was quantified from the updated parameters (i.e. flexural stiffness values).
유체-구조 상호작용 기법을 이용한 일회용 약물주입기의 성능예측 및 최적 설계
김헌영(H.Y. Kim),김학진(H.J. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study examines the performance of disposable drug infuser and proposes an optimum design introducing an elastic body structure. Disposable drug infuser was based on the principal of the recovery force exerted by the elastic diaphragm, as to provide a constant supply of drugs to an out patient who stays away from hospital. It also controls the speed, the duration and the amount of drugs to be released. The existing disposable drug infuser has generally revealed two major problems: one is that the infusion pressure depends on the amount of drug to be infused and the other is that drug infusion decreases. The experiment in this article aims to build and implement the optimum design with respect to the method of fluid-structure interaction, which allows the infusion pressure to remain constant throughout all steps of drug infusion and discharge.