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크리깅 메타모델과 유전알고리즘을 이용한 신뢰도 계산 및 신뢰도기반 최적설계
조태민(Tae-Min Cho),이병채(Byung-Chai Lee) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.11
In this study, effective methods for reliability estimation and reliability-based design optimization(RBDO) are proposed using kriging metamodel and genetic algorithm. In our previous study, we proposed the accurate method for reliability estimation using two-staged kriging metamodel and genetic algorithm. In this study, the possibility of applying the previously proposed method to RBDO is investigated. The efficiency and accuracy of that method were much improved than those of the first order reliability method(FORM). Finally, the effective method for RBDO is proposed and applied to numerical examples. The results are compared to the existing RBDO methods and shown to be very effective and accurate.
크리깅 메타모델과 유전자 알고리즘을 이용한 신뢰도 계산
조태민(Tae-Min Cho),주병현(Byeong-Hyeon Ju),신창민(Chang-Min Shin),이병채(Byung-Chai Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this study, the effective method for reliability estimation is proposed using tow-staged kriging metamodel and genetic algorithm. Kriging metamodel can be determined by appropriate sampling range and the number of sampling points because there are no random errors in the design and analysis of computer experiments model. The first kriging metamodel is made based on the proposed sampling points. The advanced first order reliability method is applied to the first kriging metamodel to determine the reliability and most probable failure point(MPFP) approximately. Then, the second kriging metamodel is constructed using additional sampling points near the MPFP. These points are selected using genetic algorithm that have the maximum mean squared error. The Monte-Carlo simulation is applied to the second kriging metamodel to estimate the reliability. The proposed method is applied to numerical examples and the results are almost equal to the reference reliability.
조태민(Cho Tae-Min),권태수(Kwon Tae-Soo),정현승(Jung Hyun-Seung) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Under light collision accidents, the energy absorption strategy for the coupler and expansion tube of the TTX(Tilting Train Express) initial design is established in the paper. Also, 1 st shearing bolts are designed. When the absorbed energy of the coupler reaches its maximum, the connecting bolts between the coupler and the car body are sheared off not to transmit the impact force to the car body structure. To absorb more energy after the l st shearing bolts work, a expansion tube is designed conceptually and installed at the rear part of the coupler. Using Hyper-Mesh and LS-DYNA, pre/post processing and light collision analyses are preformed, respectively.
이민정(Lee Min-Jeong),추연석(Choo Yeon-Seok),조태민(Cho Tae-Min),오현철(Oh Hyeon-Cheol),이병채(Lee Byung-Chai) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study, experiment and finite element analysis were studied about single lap joints using RTV88. At first, tensile test was conducted to obtain material properties of RTV88. From this test, it was proven that RTV88 is an elastomeric material and it can be modeled using Hyperfoam material model in ABAQUS. Then shear test was performed to obtain failure load and shear strength of RTV88. Finite element analysis was applied to single lap joint to analyze stress state. Finally, some physical quantities were studied as failure criteria.
기존선 틸팅차량 Mcp Car 차체 설계초안의 충돌에너지 흡수특성 고찰
권태수(Kwon Tae-soo),정현승(Jung Hyun-Seung),구정서(Koo Jeong-Seo),조태민(Cho Tae-min) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Crashworthy design of trains is now indispensable procedure in modern railway vehicle design for ensuring the safety of passengers and crew. It is now widely recognized that a more strategic approach is needed in order to absorb higher level energy in a controlled manner and minimize passenger injuries effectively. The first design step in this strategic approach is the design of the front end structure(so called HE extremities) to absorb a large part of total impact energy and then the structure of passengers non-accommodation zones(so called HE extremities) is designed to absorb the rest of impact energy. In this paper, the passengers entrance door area is selected as the LE(low energy) extremities and the design of the LEE was carried out. The main part of LEE design procedures is the design of energy absorbing tubes. For this purpose, the several tube candidates are introduced and compared to each others with numerical crash simulation.