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전동차 공조기 덕트 내의 유동특성에 관한 수치해석적 연구
김승택(Kim Seung-Tech),김성종(Kim Sung-Jong),박근수(Park Geun-Soo),박형순(Park Hyung-Soon) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
The inside of EMU is supplied with the cooling air from air-conditioner and the fresh air from exterior through the air-conditioner duct which is one of the air conditioning system. The shape of air-conditioner duct is a major factor in determining the air-conditioning efficiency, thermal comfort and energy efficiency. Therefore, this study is to understand the flow characteristics in the air-conditioner duct by three dimensional numerical simulation. The air-conditioner duct was calculated for the design volume flow rate, 2,726 ㎥/h/unit. From the result of calculation and measurement, the velocity at diffuser outlet presented good agreement in general. In this present study, the calculation was also performed for three volume flow rate(1,800, 2,200, 3,000 ㎥/h/unit) and total pressure characteristic curve with volume flow rate was presented.
철도차량의 북미 CFR 법규에 대한 충돌 기둥에너지 흡수에 관한 연구
김승택(Seung Tech Kim),정지호(Ji-Ho Jeong),최정용(Jeong-Yong Choi),우관제(Kwan-Je Woo) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.8
철도차량에서 있어서 충돌 시 철도차량의 전두부가 운전자 및 승객의 공간을 침투하는 위험성을 항상 내포하고 있다. 이러한 위험성을 줄이기 위해서, 철도차량의 충돌에 관한 연구들이 전세계적으로 활발히 진행 중에 있다. 2010 년에 미국연방법규인 CFR (Code of Federal Regulations)은 단부 구조물 (end frame)의 구성요소인 충돌 기둥 및 모서리 기둥에 대한 압괴조건을 추가하여 개정되었다. 본 연구에서는 충돌 기둥에 대해서 CFR 법규에 명시된 조건에 대해서 압괴해석 및 압괴시험을 수행하였고, 법규에서 근본적으로 고려한 충돌체와의 충돌해석을 수행하여 그 결과들을 비교하였다. 이를 통하여, 단부 구조물의 압괴특성과 충돌특성을 파악하고 해석의 신뢰성을 검토하여 다양한 단부 구조물의 개발에 있어서 압괴해석의 유용성을 확인하는데 그 목적이 있다. In accidents involving the collision of railway vehicles, there is a risk that structural members might penetrate the cab frame of the railway vehicle in the space in which the driver or passengers are seated. To reduce this risk, worldwide, studies on the collision of railway vehicles are underway. In North America, the Code of Federal Regulations (CFR) was revised in 2010 to include crush criteria for a collision and the corner post in an end frame. In this study, a crush analysis and crush test for a collision post and a crash analysis for a rigid cylinder were performed according to the CFR. The analysis and test results were compared and reviewed. This study aims to determine the usefulness of crush analysis for developing various end frames, and to understand the crush and crash characteristics and review the accuracy of the analysis.
김승택(Seung-Tech Kim),곽태호(Tae-Ho Kwak),이장욱(Jang-Wook Lee),이강운(Kang-Wun Lee) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
철도차량 산업에서의 모듈화는 낱개의 부품들을 하나의 조립 부품 단위로 제작하여 차체에 볼트 접합하는 것을 의미한다. 현재, 선진 철도차량 제작업체들은 각 모듈을 최종 차량에 조립하는 방식을 적용하고 있다. 이를 통하여, 공정을 단순화하여 제작 효율성을 높임으로써 일정을 단축하고 조립 부품 단위로 선행 관리를 통하여 품질을 향상시키고 있다. 본 연구에서는 일반 도시철도차량에 루프 모듈을 적용 가능한 차체의 개발에 있어서, 유한요소법을 이용한 강도 평가와 실제 제작된 차체에 대한 정하중 시험을 통하여 구조적 안전성을 확인하는데 그 목적이 있다. 강도 평가 및 하중시험에는 개정된 신규 철도안전법의 도시철도차량기술기준의 하중 조건을 적용하였다. In a railway industry, a modularization means a sub-assembly system which consists of individual components are directly bolted to the bodyshell. Nowadays, top rolling stock manufacturing companies has applied the modularization technology as a final vehicle construction method. This technology increases the efficiency of production as simplifying the process and improves the production quality through the management in a stage of a sub-assembly. The purpose of this study is that the structural safety of the bodyshell bolted with a roof module is verified by a FE analysis and a static load test for the carbody structure built. The FE analysis and the load test are carried out according to the load cases defined in the “Technical Specification for Urban Railway Vehicle” in the revised “Railroad Safety Act”.
철도차량 collision post 압괴 시험에 대한 연구
김승택(Seung Tech Kim),하홍기(H.G. Ha),김광우(K. W. KIM) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
철도차량에서 있어서 충돌 시 철도차량의 전두부가 운전자 및 승객의 공간을 침투하는 위험성을 항상 내포하고 있다. 이러한 위험성을 줄이기 위해서, 철도차량의 충돌에 관한 연구들이 전세계적으로 활발히 진행 중에 있다. 2010년에 미국연방법규인 CFR (Code of Federal Regulations)은 단부 구조물의 구성요소인 collision post 및 corner post에 대한 압괴조건을 추가하여 개정되었다. 본 연구에서는 법규에서 요구하는 압괴 조건에 대해서 실제 제작된 단부 구조물의 시험 및 평가 방법에 대해서 기술하였으며, 시험 결과와 법규에서 요구하는 사양 조건을 비교하였다. 그럼으로써, 단부 구조물의 압괴 특성을 파악하고 향후 다양한 단부 구조물 개발에 있어서 기초 자료로 사용하는데 그 목적이 있다. The cab frame of railway vehicle has a potential risk as the structure member penetrating the space of driver or passenger when the collision happens. To reduce the risk, the studies on the collision of railway vehicle are underway worldwide. Code of Federal Regulations (CFR) was revised on 2010 as including the crush criteria for the collision and corner post in the end frame. In this study, the test methodology and evaluation method are described for the manufactured end frame according to crush condition required from the regulation and the test results are compared with the required criteria. Therefore, the purpose of this study is to understand crush characteristics of the end frame and to use base data for developing various end frames in future.
A Development of High Strength Hybrid Car Bodyshell Using Optimization Algorithms
Hakun Shin,Kwang-Woo Kim,Seung-Tech Kim,Jang-Wook Lee 한국도시철도학회 2017 IJAR Vol.5 No.1
Recently, car bodyshell strength requirements have been strengthened. The need for lightweight car body designs was increased to improve energy consumption efficiency. Accordingly, the purpose of this study is to develope the hybrid EMU bodyshell that uses both steel and aluminium as material to satisfy the two requirements. EN12663-1 P-III was used as car bodyshell strength standard. Whether the strength of car bodyshell was satisfied or not was determined by using the Finite Element Method. Later, the car bodyshell weight lightening was conducted by using an optimization algorithm, a combination of topology optimization technique and size optimization technique.
최정용(Choi Jeong-Yong),김승택(Kim Seung-Tech),박근수(Park Geun-Soo),박형순(Park Hyung-Soon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently it is a tendency that Diesel rolling stock is committing in the commuter"s train route of the suburb for solving commuting traffic congestion. It has advantage which expense of diesel rolling stock is relatively cheaper than electric rail car or high-speed train. In addition, it can be using the exist route without large-scale facility investment. Because of this advantage, the demand of diesel rolling stock occupy regular portion from overseas railway car market. GM/RT 2100 specifies the loads vehicle bodies shall be capable of withstanding, identifies how material data shall be used and presents the principles to be used for design verification by analysis. Therefore, in order to fulfill the structural requirements, Rotem Company has carried out Finite Element Analysis (FEA) to verify whether the carbody structure has enough strength to withstand the loads specified by GM/RT 2100. This research contains the results obtained by the analysis. The analysis was carried out using I-DEAS 12 NX Series.