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임홍재(H.J.Yim),이상범(S.B.Lee),장현수(H.S.Jang),유헌일(H.I.Yoo) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Dynamic and static characteristics of the beam structure are mainly influenced by the shape of the cross section and material properties. Since the shape of the cross section determines the stiffness of the beam. such as I_x. I_y. J. an optimal shape of the cross section of the beam must be searched for the optimal stiffness design of the beam structure. In this paper an optimal design methodology for the thin-walled beam structure is presented.<br/>
임홍재(H.J.Yim),이호용(H.Y.Lee),최동운(D.U.Choi),박재건(J.K.Park),권성은(S.Y.Koun),이명식(M.S.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
A section analysis and design program named SECOPT has been developed to compute cross section properties of general thin-walled open, close, single, or multi-cellular sections. SECOPT, a program developed especially to help designers of vehicle structures where non-standard geometrical shape of beam section are encountered. The program integrates optimization of beam section with automatic calculations and satisfaction of constraints on section properties. The section optimization function of SECOPT provides with the ability to design minimum weight sections that meet a specified set of constrains on moment of inertias and torsional constant.<br/>
김효식(H.S. Kim),황용서(Y.S. Hwang),윤호상(H.S. Yoon),김창부(C.B. Kim),임홍재(H.J. Yim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Durability estimation of a prototype vehicle has traditionally relied heavily on accelerated durability tests using predefined proving grounds. By use of those accelerated tests, it is very difficult to predict durability failures in an actual service environment. This motivated the development of an integrated CAE(Computer Aided Engineering) methodology for the durability estimation of a prototype vehicle in actual service environments. Since expensive computational costs such as computation time and hardware resources are required for a full vehicle simulation in those environments with a very long span of event time, the conventional CAE methodologies have little feasibility. An efficient computational durability estimation method is presented with theoretical and technique developments.
Computational Durability Estimation of a Prototype Vehicle
H. S. Kim(김효식),C. B. Kim(김창부),H. J. Yim(임홍재) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
Durability estimation of a prototype vehicle has traditionally relied heavily on accelerated durability tests using predefined proving grounds. By use of those accelerated tests, however, it is very difficult to predict durability failures in an actual service environment. This motivated the development of an integrated CAE(Computer Aided Engineering) methodology for the durability estimation of a prototype vehicle in actual service environments. Since very expensive computational costs such as computation time and hardware resources are required for a full vehicle simulation in those environments, the conventional CAE methodologies have little feasibility. An efficient computational methodology for durability estimations is presented with theoretical and technique developments.
이상범(S.B.Lee),임홍재(H.J.Yim),장현수(H.S.Jang),박재건(J.K.Park),권성은(S.E.Kwon) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Low frequency vibration characteristics of a vehicle are mainly influenced by the stiffnesses of the beam type structures such as pillars and rockers and by the stiffnesses of the joint structures, at which several beam structures are jointed together. In this paper the method of modeling and optimization for joint stiffnesses and joint design parameters of the vehicle structure are proposed. First it is described that the method of modeling the joint structure with equivalent stiffness beam elements. To get required dynamic characteristics such as natural frequencies. section properties of the equivalent beam element are set to design variables and optimized. The study shows that joint stiffnesses and joint design parameters can be effectively determined using the proposed method.<br/> <br/>
소형버스의 동역학 해석을 위한 판스프링 모델링기법 개발
박태원(T. W. Park),임홍재(H. J. Yim),이기호(G. H. Lee),박찬종(C. J. Park),정일호(I. H. Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
A leaf spring plays an important role in a passenger bus. Since characteristic of a leaf spring has a hysteresis behavior, a modelling technique for a leaf spring is an imPortant issue for a passenger bus analysis. In this paper, modelling technique for a leaf spring is presented. First, non-linear FEM model of a leaf spring is constructed then it is used to make an approximated model to be used in dynamic analysis. The modelling procedure is explained in step by step approach. Then. this model is applied to mini-bus dynamic analysis with flexible body and non-linear dynamic force element and the results are compared with test data.<br/> <br/>
이장무(J.M.Lee),임홍재(H.H.Yim),김종현(J.H.Kim),조시기(S.G.Choi) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a computational method is presented for accurate dynamic<br/> analysis of the engine mount system that is supported by flexible foundation. Equations of motion for the engine mount system including flexible foundation are derived. The flexibility of the foundation is obtained in the form of the modal mass, stiffness matrices and mode shape vectors by performing finite element modal analysis. It is shown that the flexibiIity of the foundation has a signi ficant effect on the vibration modes and dynamic behavior of the engine mounting system.<br/>