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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.
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.
도시철도차량 차체의 경량화를 위한 소재 변경 및 구조체 최적화 연구
조정길(Jeong Gil Cho),구정서(Jeong Seo Koo),정현승(Hyun Seung Jung) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.9
본 연구에서는 알루미늄 압출재로 구성된 한국형 표준전동차모델(K-EMU)의 차체를 대상으로 치수 최적설계와 구조체 소재 변경을 통한 경량화방안에 대해 연구하였다. 우선 K-EMU 차체의 하부구조, 측벽구조, 단부구조의 부재별 두께를 현재의 압출가능 두께를 적용하여 치수 최적화 기법으로 약 14.8% 경량화 하였다. 그리고 치수최적설계 된 K-EMU 차체에 유지보수성이 좋은 고장력강(SMA570)재질의 프레임타입 하부구조를 적용하여 초기 K-EMU 차체대비 약 3.8% 경량화 된 하이브리드 차체를 도출하였다. 마지막으로 샌드위치 복합재를 하부구조와 지붕구조에 적용하여 초기 K-EMU 차체대비 약 30% 경량화 된 초경량 하이브리드 차체를 도출하였다. 도출된 차체 모델들은 모두 전동차 구조체 하중시험법을 만족하였다. This study proposes a weight reduction design for urban transit, specifically, a Korean EMU carbody made of aluminum extrusion profiles, according to size optimization and useful material changes. First, the thickness of the under-frame, side-panels, and end-panels were optimized by the size optimization process, and then, the weight of the Korean EMU carbody could be reduced to approximately 14.8%. Second, the under-frame of the optimized carbody was substituted with a frame-type structure made of SMA 570, and then, the weight of the hybrid-type carbody was 3.8% lighter than that of the initial K-EMU. Finally, the under-frame and the roof-panel were substituted with a composite material sandwich to obtain an ultralight hybrid-type carbody. The weight of the ultralight hybrid-type carbody was 30% lighter than that of the initial K-EMU. All the resulting carbody models satisfied the design regulations of the domestic Performance Test Standard for Electrical Multiple Unit.
단순 Box형 Cut-out 차체모델의 경량화를 위한 이론적 개념설계 모델 연구
조정길(Jeong-Gil Cho),구정서(Jeong-Seo Koo),정현승(Hyun-Seung Jung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In this paper a theoretical approach was studied to make a baseline box type model satisfying the stiffness condition of a cut-out model. First we compared the sum of the sectional theoretical deflections and the FEM result of the cut-out model under the static load test conditions and we obtained good correlations from both the results. Second To obtain the thickness of the baseline model we used the mean value of geometric moment of intertia of the side wall and roof structure. Also we compared the theoretical results and the FEM result of a baseline model and we obtained good correlations. It is considered that the developed theoretical approach can be used for the weight reduction of train carbodies.