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신정규(J.K.Shin),이정욱(J.W. Yi),이해주(H.J. Lee),박경진(G.J. Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A rotor bar in an induction motor for electric railway is studied from a design viewpoint. The design<br/> process is divided into two stages; conceptual design and detailed design. In conceptual design, overall<br/> configuration is determined. A computer program is developed for the conceptual design. Various formulae<br/> are developed for analysis. They are derived from elementary and advanced elasticity. Design equations are<br/> made from the formulae and they are programmed with Graphic User Interface (GUI) for user convenience.<br/> Structural optimization is adopted for the detailed design. Finite element method is used for analysis. A design<br/> problem is defined to minimize mass or maximum stress while constraints are satisfied.
충돌모의시험시 시험결과와 해석결과에 대한 변수 조절에 관한 연구
임재문(J.M.Lim),최우석(W.S.Choi),최중원(J.W.Choi),박경진(G.J.Park),신윤재(Y.J.Shin),이재협(J.H.Lee),김규현(K.H.Kim),윤경한(K.H.Yoon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
충돌모의시험을 컴퓨터 시뮬레이션하기 위하여 매개변수 (prameter)<br/> 조절과정(tuning process) 을 통하여 시험결과와 해석결과를 일치시켜 모델링을 완성시키는 절차를 확립하고자 하였다 . 매개변수로는 힘 -변형 합수의 보정계수 (scale factor)와 에어백의 질량호름을 곡선의 보정계수를 택하였다 . 매개변수 조절과정을 통하여 연구를 수행 한 결과 HIC 및 머리의 가속도곡선은 시험결과와 잘 일치하였다 . 가슴의 가속도곡선 및 대퇴부의 상해치 풍도 잘 일치시키기 위해서는 다목적합수에 기초한 최적화과정이 필요할 것으로 생각된다 .<br/>
등가정하중을 이용한 구조최적설계 방법을 이용한 비선형 거동 구조물의 최적설계
박기종(K. J. Park),박경진(G. J. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Nonlinear Response Optimization using Equivalent Static Loads (NROESL) method/algorithm is proposed to perform optimization of non-linear response structures. It is more expensive to carry out nonlinear response optimization than linear response optimization. The conventional method spends most of the total design time on nonlinear analysis. Thus, the NROESL algorithm makes the equivalent static load cases for each response and repeatedly performs linear response optimization and uses them as multiple loading conditions. The equivalent static loads are defined as the loads in the linear analysis, which generates the same response field as those in non-linear analysis. The algorithm is validated for the convergence and the optimality. The function satisfies the descent condition at each cycle and the NROESL algorithm converges. It is mathematically validated that the solution of the algorithm satisfies the Karush-Kuhn-Tucker necessary condition of the original nonlinear response optimization problem. The NROESL algorithm is applied to two structural problems. Conventional optimization with sensitivity analysis using the finite difference method is also applied to the same examples. The results of the optimizations are compared. The proposed method is very efficient and derives good solutions.
박영선(Y.S.Park),박경진(G.J.Park),박상희(S.H.Park),이형주(H.J.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
A simulation model of a belt integrated seat(BIS) is established using a structural analysis and design program GENESIS. The model is validated by the well consistent with the static load test and a reference with a conventional seat. The Loading conditions are defined by the belt forces form the dynamic load test of a conventional belt integrated seat The seat components are reinforced to carry the crash force and a trend of the design of belt integrated seat is proposed through the process of structural optimization.
박영선(Y.S.Park),양우호(W.H.Yang),임재문(J.M.Lim),박경진(G.J.Park),박상희(S.H.Park),이형주(H.J.Lee) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
A simulation model of a belt integrated seat(BIS) is established using a computer simulation program ATB (Articulated Total Body). The model is validated by the well consistent with the dynamic load test with a conventional belt integrated seat. Hyper-ellipsoid elements are used to improve the accuracy of a simulation model and numerical results show the better performance of a BIS than a conventional seat for the view point of a occupant safety. A parameter study of seat belt is performed to choose 'the proper belt for a BIS.
박영선(Y. S. Park),이주영(J. Y. Lee),박경진(G. J. Park),위인혁(I.H.Wi),유재석(J.S.Ryou) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the crash environment, the safety analysis becomes very essential wi th the growth of automobile industry. Therefore. an airbag system is required to protect the occupant. The exact effects of an airbag can be evaluated from the barrier or sled test which is<br/> quite expensive. In this study. the airbag system in a domestic passenger car is analyzed with the computer simulation program CAL3D. The modeling of a passenger car including an airbag is established and the results are verified by comparisons with real crash 'tests. A graphic post-processor is developed for the dynamic behavior of an<br/> occupant. Some sensitive design parameters of an airbag are determined and design trends are recomended to minimize HIC(Head Injury Cri terion) wi th the orthogonal array of statistical methods.<br/>
구와 원환체를 이용한 에어백의 모델링 및 비정상위치시의 승객 거동 해석
임재문(J.M. Lim),김창환(C.H. Kim),박경진(G.J. Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
자동차의 급증으로 인한 교통사고로부터 인면피해를 줄이기 위하여 에어백의 장착이 의무화 되어가고 있다. 차량충돌시 에어백은 정상위치에 있는 승객의 상해치는 감소시키나, 비정상위치(out-of-position)에 있을 때는 승객이 받는 상해치가 증가할 수도 있다. 즉, 에어백의 팽창력이 비정상위치에 있는 승객에게 정상위치보다 크게 작용하여 머리와 가슴의 상해치가 높아질 수 있기 때문이다. 본 연구에서는 비정상위치의 운전자에 대해 에어백의 팽창력이 미치는 영향을 검토하기 위하여 충돌시 승객거동해석이 가능한 범용 소프트웨어를 이용하였다. 기존의 소프트웨어에서는 운전자용 에어백을 하나의 타원체로 모델링하여 그 거동을 해석하고 있으나, 팽창하는 도중의 에어백은 구와 원환체를 합친 형상과 유사하다. 이를 위하여 구와 원환체를 이용하여 에어백을 모델링하였으며, 구와 원환체의 접촉 알고리즘을 개발하여 기존의 소프트웨어에 접목시켰다. 개발된 알고리즘과 프로그램을 이용하여 HIC(head injury criterion), CSI(chest severity index) 및 머리와 가슴의 가속도파형을 구하여 이를 논하였다.<br/>
박영선(Park Y.S),이주영(Lee J.Y),박경진(Park G.J) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As the occupant safety receives more attention from automobile industries. protection systems have been developed quite well. Developed protection systems must be evaluated through real tests in crash environment Since the real tests are extremely expensive, computer simulations are replaced for some prediction of the real test The energy absorbing(EA) steering system has a very important role in vehicle crashes because the occupant can hit the system directly. The EA steering system is disassembled by parts and modeled by segments and joints. The body block test is carried out to validate the modeling. The established model is applied to a crash simulation of a full-car model and tuned again. After the modeling is. finished, components of the steering system are designed to minimize the injury of a passenger by an optimization algorithm.<br/>