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실험계획법과 CAE를 이용한 도아씨일(Door Seal) 설계
엄정기(J.G. Eom),김동석(D.S. Kim),박재건(J.K. Park),이명식(M.S. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Sealings between doors and vehicle body are essential to keep airtightness of vehicle compartment and to cut off outside noise, rain and dust. They are usually made of expanded rubber and deform similar to cork whose poisson's ratio is nearly zero. Therefore hyperform material model is used for analysis. Simulation is done by using ABAQUS. In order to confirm this material model, simple tension test and door seal compression test are performed<br/> and the results are compared with simulation and they showed good agreement. Finally, design parameter study is performed using Taguchi method to find optimal seal design of reduced reaction force. The change of thickness and material strength of door seal of window frame is the most effective in reducing reaction force.<br/> <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/>
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/>
강성도 설계인자 기여도 분석을 통한 차체 결합부의 최적설계
이상범(S.B.Lee),임홍재(H.J.Yim),권성은(S.E.Kwon),박재건(J.K.Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
The joint stiffnesses must be determined in the early design stage of the vehicle structure. The joints of vehicle structure consist of several sheet. panels with spot welding. The stiffnesses of joints are characterized by section geometric shape. thickness. etc. In this paper joint stiffness variations according to the design change of reinforcement size. flange width, and flange roundness are studied. Optimal design techniques for obtaining the required stiffnesses of the joint structure is presented.<br/>
승객 거동 해석을 통한 퓨즈 형태 벨트(Fuse-type belt)의 효과 분석
이상헌(S.H. Lee),김동석(D.S. Kim),박재건(J.K. Park),이명식(M.S. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
FE approach using reliable Finite Element(FE) dummy mode] had several strong aspects over Rigid-Body dynamic approach in occupant simulation. Rigid body dynamic approach requirs Force-Displcement(F-D) information between impacting dummy and planes of vehicle structure and component tests are essential to get that kind of information. But in FE approach, material properties are only needed. So FE approach is very convenient at the first stage of design when the test data are not available. In this study, occupant simulation was done by using commercial FE program, PAM-SAFE, in order to know the effect of fuse-type belt on occupant injury reduction. A fuse is installed at lap belt. The result showed 13% reduction of HIC with this type of belt.<br/> <br/>