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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/>
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/>
김진식(J. S. Kim),박정훈(J. H. Park),임홍재(H. J. Yim) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
This paper presents the dynamic analysis method for an electromechanical system. The engineer has at his disposal a variety of software simulation tools. However, difficulties arise when the study of the behavior of complex electromechanical systems in combination with coupling element is required. Typical examples of such systems are machines for factory automation, home automation, and office automation. Dynamic systems analysis packages or electronic systems analysis packages offer the restrictive to simulate these mixed systems such electromechanical product. Electronic circuit analysis algorithm is easily incorporated into a multi-body dynamics analysis algorithm. The governing equation of electronic circuit is formulated as a differential algebraic equation form including both electrical and mechanical variables and is simultaneously solved in every time step. This analysis method clearly demonstrates the application potential for mixed electromechanical simulation.
지지부의 유연성을 고려한 엔진 마운트의 동특성 해석 및 최적설계에 관한 연구
송명의(M.Y.Song),최동운(D.U.Choi),임홍재(H.J.Yim),김종현(J.H.Kim),이장무(J.M.Lee),류제하(J.H.Liu) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Using the equations of motion for the engine mount system including foundation flexibility, forced vibration analysis is carried out for the given engine mount system excited with the unbalanced force and moment using the program developed in this paper. A new optimal design method, in which modal frequencies of the supporting structure can be integrated as design variables, is presented.<br/>
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.