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철도차량 추진제어장치 성능시험을 위한 관성부하 시험설비의 구조안전성 및 동특성 평가 연구
장형진(Hyung-Jin Jang),신광복(Kwang-Bok Shin),이상훈(Sang-Hoon Lee),이대봉(Dae-Bong Lee) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
This paper describes the evaluation of structural integrity and dynamic characteristic of inertial load test equipments for performance test of railway vehicle propulsion control system. The propulsion control system of railway vehicle has to be confirmed of safety and reliability prior to it's application. Therefore, inertial load test equipments were designed through theoretical equation for performance test of propulsion control system. The structural analysis of inertial load test equipments was conducted using Ansys v11.0 and it's dynamic characteristic was evaluated the designed using Adams. The results showed that the structural integrity of inertial load test equipment was satisfied with a safety factor of 10.2. Also, the structural stability was proved by maximum dynamic displacement of 0.82㎜.
최적화 해석기법을 이용한 샌드위치 복합재와 알루미늄 압출재 하이브리드 모듈화 차체구조물의 경량 설계 연구
장형진(Hyung Jin Jang),신광복(Kwang Bok Shin),한성호(Sung Ho Han) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.11
본 논문은 위상최적화와 치수최적화 해석기법을 이용한 샌드위치 복합재와 알루미늄 압출재로 구성되는 하이브리드 철도차량 차체 구조물의 경량 모듈화 설계에 관한 연구이다. 위상최적설계는 초기설계단계에 차체 구조물의 최적의 재료적용부위를 선정하기 위해 사용되었으며, 치수최적화설계는 하이브리드 차체 구조물의 최적 설계 변수를 찾기 위해 사용되었다. 이때, 최적화해석은 일계법과 부분문제근사법을 사용하였다. 위상최적설계해석을 통해 차체 구조물의 강성 및 제작성을 향상시키기 위한 언더프레임, 로우 사이드 패널 모듈에 1차 부재인 알루미늄 압출재의 적용이 적절하고, 샌드위치 복합재는 무게를 최소화하기 위한 2차 부재로서 루프 및 미들 사이드 패널 모듈에 적용이 적합하다는 결론을 얻었다. 또한, 알루미늄 압출재와 샌드위치 복합재로 구성되는 하이브리드 차체 구조물의 무게는 샌드위치 복합재로만 만들어진 차체 구조물과 비교하여 최대 17.7%까지의 경량화 효과를 얻을 수 있음을 확인하였다. In this study, the lightweight modular design of hybrid railway carbody structures made of sandwich composites and aluminum extrusions was investigated by using topology and size optimization techniques. The topology optimum design was used to select the best material for parts of the carbody structure at the initial design stage, and then, the size optimum design was used to find the optimal design parameters of hybrid carbody structures using first-order and sub-problem methods. Through the topology optimization analysis, it was found that aluminum extrusions were suitable for primary members such as the underframe and lower side panel module to improve the stiffness and manufacturability of the carbody structures, and sandwich composites were appropriate for secondary members such as the roof and middle side panel module to minimize its weight. Furthermore, the results obtained by size optimization analysis showed that the weight of hybrid carbody structures composed of aluminum extrusions and sandwich composites could be reduced by a maximum of approximately 17.7% in comparison with carbody structures made of only sandwich composites.
틸팅열차의 샌드위치 복합재 차체 구조물에 대한 충돌안전도 평가 및 향상방안 연구
장형진 ( Hyung Jin Jang ),신광복 ( Kwang Bok Shin ),한성호 ( Sung Ho Han ) 한국복합재료학회 2011 Composites research Vol.24 No.5
본 논문은 샌드위치 복합재 틸팅열차의 충돌안전도 평가 및 성능 향상방안에 대해 서술하고 있다. 차체 구조물에 적용된 샌드위치 복합재는 알루미늄 하니컴 심재와 유리섬유 및 카본/에폭시 적층 복합재 면재로 이루어져있다. 충돌해석은 외연유한 요소 해석 프로그램인 LS-DYNA3D를 이용하였다. 이때, 유한요소모델링과 충돌해석 계산시간의 절약을 위하여 3차원 유한요소모델과 1차원 등가 모델을 적용하였다. 틸팅열차의 충돌 조건은 철도안전법에 명시하고 있는 4가지 충돌사고 시나리오를 고려하여 해석을 수행하였다. 충돌해석 결과 시나리오-2를 제외한 나머지 충돌 시나리오에서 성능 요구조건을 만족하였다. 충돌 시나리오-2의 충돌안전도 요구조건을 충족하기 위하여 전두부의 적층복합재 커버와 금속프레임의 강성 향상방안을 제안하였으며, 결과적으로 충돌 시나리오-2의 요구조건을 만족하였다. This paper describes the crashworthiness evaluation and performance improvement of tilting train made of sandwich composites. The applied sandwich composite of carbody structure was composed of aluminum honeycomb core and glass/epoxy & carbon/epoxy laminate composite facesheet. Crashworthiness analysis of tilting train was carried out using explicit finite element analysis code LS-DYNA 3D. The 3D finite element model and 1D equivalent model were applied to save the finite element modeling and calculation time for crash analysis. The crash conditions of tilting train were conducted according to four crash scenarios of the Korean railway safety law. It found that the crashworthiness analysis results were satisfied with the performance requirements except the crash scenario-2. In order to meet the crashworthiness requirements for crash scenario-2, the stiffness reinforcement for the laminate composite cover and metal frames of cabmask structure was proposed. Consequentially, it has satisfied the requirement for crash scenario-2.
샌드위치 복합재와 알루미늄 압출재를 적용한 하이브리드 경량 차체 구조물의 모듈화 설계 연구
장형진(Hyung-Jin Jang),신광복(Kwnag-Bok Shin),한성호(Seong-Ho Han) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The purpose of this study is to propose the modular design of hybrid lightweight carbody structures made of sandwich composites and aluminum extrusion. The sandwich composites were used for secondary structures to minimize the weight of carbody and the aluminum extrusions were applied to primary structures to improve the stiffness of carbody and manufacturability. Key requirements were defined for the modular design of hybrid carbody and the applied parts of sandwich composites were determined through the topology optimization analysis. Consequently feasibility of enhancing mass saving and maintainability in modular hybrid carbody design were presented comparing with the carbody structures made of aluminum extrusion or sandwich composites only.
운영환경을 고려한 KTX 안티롤바의 구조동특성 계측시험 평가 및 너클부의 표면피로마모 감소방안 연구
장형진(Hyung Jin Jang),전광우(Kwang Woo Jeon),신광복(Kwang Bok Shin),김진우(Jin Woo Kim),김대식(Dae Sik Kim),정연일(Yeon Il Jeong) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.10
본 연구는 KTX 안티롤바 너클부의 표면피로마모 특성을 개선하기 위하여 시험 및 수치해석적 방법을 사용하였다. 실험의 경우 KTX 안티롤바의 강재너클 구조와 KTX-산천의 얇은 금속판과 고무가 층을 이루는 탄성너클 구조에 대해 호남선의 운행환경을 고려한 구조동특성을 비교 평가하였다. 이때, 가속도 및 응력 데이터를 각각 측정하였다. 시험결과 분석을 통해 안티롤바 커넥팅로드의 홀 사이즈 증가가 요구되나, KTX 안티롤바 너클구조의 표면피로마모를 감소시키기 위한 최선의 해결책으로 탄성너클 구조가 제안되었다. 수치해석의 경우 KTX 안티롤바 강체 및 탄성너클 구조에 대해 LS-DYNA3D를 사용하여 구조동특성 해석을 수행하였으며, 시험과 비교평가를 통해 사용된 유한요소모델의 신뢰성을 확보하였다. 수치해석 결과 강체너클이 적용된 안티롤바의 응력 및 속도장 보다 탄성너클 구조가 너클과 커넥팅로드 사이의 상대적 접촉이 감소하여 응력 및 속도장이 좀 더 적정한 것으로 나타났다. 따라서, KTX 안티롤바에 탄성너클 구조의 적용이 표면피로마로 특성을 향상시킬 수 있을 것으로 사료된다. In order to improve the surface fatigue wear property of the knuckle part of KTX anti-roll bar, the experimental and numerical approach was used in this study. In the experiment, acceleration and stress data for the steel knuckle structure (rigid knuckle) of KTX anti-roll bar and the thin steel plate/rubber layeredknuckle structure (elastic knuckle) of KTX-SANCHUN anti-roll bar, respectively, were measured to evaluate and compare its structural dynamic characteristics under operating environments of Honam line. Through the analysis of the results of the experiment, the elastic knuckle structure was suggested as best solution to reduce the surface fatigue wear of the knuckle structure of KTX anti-roll bar, although the hole size increase for connecting rod of anti-roll bar was required. In the numerical approach, the structural dynamic analysis using LS-DYAN3D was conducted for the rigid and elastic knuckle structure of KTX antiroll bar, and the reliability of the used finite element models was ensured by comparative evaluation with experiment. The numerical results showed that the stress and velocity field in the elastic knuckle structure more moderated resulting from the reduction of relative contact between the knuckle and connecting rod than the stress and velocity field in anti-roll bar to which the rigid knuckle was applied. Therefore, it is expected to improve its surface fatigue wear characteristics due to the application of the elastic knuckle structure of KTX anti-roll bar.
샌드위치 복합재 적용 철도차량 차체 구조물의 표준유한요소모델 제시 연구
장형진(Jang Hyung-Jin),고희영(Ko Hee-Young),신광복(Shin Kwang-Bok) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
This paper describes an introduction of standard finite element model for carbody structures of railway vehicle made of sandwich composites. Recently, sandwich composites were widely used to railway vehicle due to improvement of energy efficiency, high specific stiffness and strength, weight reduction and space saving. However, a study on the standardized finite element model for railway vehicle made of sandwich composite was scarcely done. Therefore, standard finite element model for sandwich carbody structures was proposed by verification of real structural test under vertical, compressive, twisting load and natural frequency test of various railway vehicle in this study. The results showed that the quadratic shell element was suitable to model the metal frame used to reinforce the flexural stiffness of sandwich panel in comparison with beam element and layered shell and solid element were recommended to model the skin and honeycomb core of sandwich panel in comparison with sandwich shell element. Also, the proposed standard finite element model has the merit of being applied to crashworthiness problem without modification of finite element model.
김계은,정승기,정희재,장형진,Kim, Gae-Eun,Jung, Sung-Ki,Jung, Hee-Jae,Jang, Hyung-Jin 대한한방내과학회 2010 大韓韓方內科學會誌 Vol.31 No.2
Objectives : Atopic dermatitis is a chronic inflammatory skin disease which is characterized by severe pruritis, erythema, edema, effusion and scabs. The aim of this study was to understand effects of Arctium lappa Linne, which is well known for its efficacy for various skin diseases, on atopic dermatitis Methods : We conducted this experiment using the DNFB-induced NC/Nga mice. After two weeks of applying DNFB to NC/Nga mice, severe symptoms of atopic dermatitis occurred. We divided the mice into three different groups: a control group which was given no treatment at all, a group treated with dexamethasone (1mg/kg), and another group treated with Arctium lappa Linne (300mg/kg). After one week of treatment, results were recorded according to their improvement on skin, itching behavior, IL-4, and INF-$\gamma$ measurement, which is a significant criterion for diagnosing atopic dermatitis. Results : Itching behavior showed significant improvement in the Arctium lappa Linne group. However Arctium lappa Linne failed to reduce IL-4 and INF-$\gamma$ count. Also there was no satisfying improvement on AD-like skin lesions on the rostral back of the NC/Nga mice treated with Arctium lappa Linne. Conclusions : Arctium lappa Linne showed improvement in itching behavior in NC/Nga mice induced by DNFB. Arctium lappa Linne showed neither significant improvement on skin lesions nor in IL-4 and INF-$\gamma$ measurement.