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Cut-out이 있는 단순 Box형 차체의 소재대체 경량화 설계 방법
조정길(Jeonggil Cho),구정서(Jeongseo Koo),정현승(Hyunseung Jung) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this paper, to substitute an underframe material of a box-type bodyshell having cut-outs, we suggested a material substitution method with an alternative light-weight material. We derived a box-type baseline model without cut-outs which is similar to the stiffness condition of a box-type bodyshell having cut-outs. To derive a hybrid bodyshell by under-frame material substitution, the material substitution method for a box-type hybrid bodyshell without cut-outs was applied to the box-type baseline model. We compared the FE simulation results of the derived hybrid bodyshells having cut-outs for various materials with the theoretical results of the suggested method.
[기술논문] 소형궤도차량(PRT) 차체의 설계사양 도출 및 구조강도 평가 연구
조정길(Jeonggil Cho),구정서(Jeongseo Koo),강석원(Seokwon Kang),정락교(Raggyo Jeong) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.4
PRT(Personal Rapid Transit) system is a new transportation system which will meet increasing demands of traffic in Korea. It is also an environment-friendly transportation and automatically operated. For these reasons, researches on the PRT system are actively undergoing, but the PRT vehicles have different forms of subway, bus, etc. There are no design standards to evaluate structural integrity, yet. In this paper, Structural design specifications are derived, which are based on the performance test standard for EMU and the ASCE-APM standards. We also perform the static and fatigue analyses by FE simulation and suggest strategies to improve an initial structure design. In addition, we derived the design specifications for energy-absorbing structures to meet the conditions of the collision scenarios predefined from a view point of operation safety.
Box형 차체의 하부구조를 소재대체 한 하이브리드형 차체의 경량화 설계 연구
조정길(Jeonggil Cho),구정서(Jeongseo Koo),정현승(Hyunseung Jung) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.5
This paper studied on a theoretical approach to predict structural performances and weight -reduction rates of hybrid bodyshells in case that the material of underframe structure is substituted. To choose other light-weight materials to be substituted for the original underframe material, compressive, bending and twisting deformations are considered under constant stiffness and strength conditions, which derive some new weight-reduction indices from a structural performance point of view. Next, these weight-reduction indices were verified using the finite element analyses of some simplified examples. It is shown that the derived indices to estimate the weight-reduction can be utilized as a good criterion for material substitution of the underframe at a basic design stage.
비중량 기계적 물성치를 이용한 하이브리드형 차체 모델의 경량화 평가 연구
조정길(Jeonggil Cho),구정서(Jeongseo Koo),정현승(Hyunseung Jung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we estimated the weight-reduction rate of a hybrid-type bodyshell for several engineering materials using specific stiffness and strength indices. For evaluating the weight-reduction rate of a hybrid box-type model in a given condition, we used a theoretical approach and verified it with finite-element analysis. We obtained a good correlation between both the results. The suggested approach can be applied to the weight reduction design of hybrid bodyshells by material substitution. The specific mechanical properties to estimate the weight-reduction can be utilized as good criteria for material substitution of hybrid bodyshells at the basic-design stage.
도시철도차량 경량화를 위한 하이브리드형 차체 모델 연구
조정길(Jeonggil Cho),구정서(Jeongseo Koo),정현승(Hyunseung Jung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this paper, We made a simple Box type model and suggested a material substitution solution for weight reduction. For making a simple Box type model, average thickness of standard EMU are considered. We compared the simulation results of a standard EMU and a simple BOX type model under the static load test, and obtained good correlations from both results. To make a hybrid bodyshell, we use a variety of materials and compared their results. It is considered that the developed approach to predict weight reduction rates of hybrid body shells in case that the materials of underframe structures are substituted.