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김원경(Weon-Kyong Kim),원시태(Si-Tae Won) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
In this study the load test of rubber tire bogie for monorail type LRT. Bogie for rolling stock in safety operation of the vehicle as an essential core unit before applying to the vehicle safety and reliability should be tested sufficiently. Rubber tire monorail type bogie compared to the traditional bogie wheel lots of formats the complexity of the load acting static load test the bogie of the vehicle operation conditions by structural analysis by considering the loading conditions was evaluated by calculating. Test methods and evaluation criteria based on urban rail vehicle performance testing by applying the test were welded parts and materials for the results leading to material fatigue endurance test by applying the result of evaluating the structure has been identified as safe.
철도차량 알루미늄 차체 용접방법에 따른 하중시험결과 비교 고찰
김원경(Kim Weon-kyong),원시태(Won Si-Tae),전창성(Jeon Chang-Sung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
This study introduces comparison the testing results of the AL car body which is applied to FSW and GMAW welding method . The car body is made of aluminum structure materials like a sandwich panel. The static load test was performed to evaluate the structural characteristic and stability of the AL car body. Considering the vertical, compressive, twisting load and 3-point supporting, Bend natural frequency Measurement, Twist natural frequency Measurement type as a testing terms, the structural stability of a car body was evaluated.
A6005 압출재의 피로 성능 향상을 위한 마찰 교반 용접 공법 최적화
김원경(Kim Weon-kyong),원시태(Won Si-tae),구병춘(Goo Byeong-choon) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In this paper, optimum values of welding variables including the welding speed, rotation speed and tilt angle are found to improve the fatigue characteristic of the friction stir welded(FSW) joint of the A6005 aluminum extrusion. According to the central composite design table, 15 FSW experiments are performed, and fatigue tests on the welding joint are done. The second order numerical model function that represents the relationship between the welding variables and fatigue strength is estimated using the response surface analysis methodology. Sequential Quadratic Programming(SQP) algorithm is used to find the optimum values of the welding variables which minimize the model function.
신형 경전철차량 대차프레임 하중시험 방법 및 결과 고찰
김원경(Kim Weon-Kyong),원시태(Won Si-Tae),전창성(Yoon Sung-Chol) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, the bogie frame weight of Light Rail Transit system has been reduced in order to save energy and materials. However, this light weighted vehicle structure is very important to verify the fatigue strength at the development stage. Bogie system consists of bogie frame, suspensions, wheel-sets, braking system and transmission system. Among these components, the bogie frame is most significant component subjected to the whole vehicle and passenger loads. In this study, the bogie frame for the New LRT power car is evaluated to the static and fatigue strength. And the evaluation method is used the LRT Performance Test Standards Specification throughout the FEM analysis and static load test. The static and fatigue test results for the LRT bogie frame of power car has been appeared very safety and stable for the design load conditions.
김원경(Weon-Kyong Kim) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10
본 논문은 국내 동력집중 식 신형고속열차용 동력차 구조체 하중시험에 관하여 연구한 내용이다. 철도차량용 구조체는 안전운행에 기본이 되는 핵심장치로서 완성차량에 적용하기 전에 구조체의 안전성 및 신뢰성이 충분히 검증되어야 한다. 특히 동력집중식 고속열차용 동력차 구조체의 경우 기관실내의 각종 전기장치의 중량이 무겁고 다양한 형태의 장치가 복잡하게 배치되어 있어 구조해석 결과 중량 물에 의한 구조체에 발생되는 응력이 매우 높게 발생되고 있으며 또한, 차량운행속도가 300㎞/h 이상 고속으로 운행하기 때문에 안전성 검증이 필수적이라 할 수 있다. 구조체 안전성 검증을 위한 방법으로 철도안전법의 성능시험관련 규정에 따라 구조체 정하중 시험을 실시하여 각 하중별 응력을 평가하고 안전기준의 시험조건 및 판정기준에 따라 안전성을 평가하였으며, 각 하중별 모재부 및 용접부의 응력을 확인한 결과 안전한 것으로 확인되었다. In this study, the load test of Power car body for New High speed train. Car Body for rolling stock in safety operation of the vehicle as an essential core unit before applying to the vehicle safety and reliability should be tested sufficiently. Especially, Centralized Power-type Car Body for High speed train on the weight of the various electrical devices of the engine room heavy and various types of devices, the stress generated in the complex, it is disposed structural analysis results the heavy weight structure is generated very high. In the addition, because it runs as a vehicle driving speed to 300㎞/h high speed over safety verification it can be called essential. Structural safety by implementing a method to structure static load test in the accordance with the performance test regulations of the railway safety codes for verification was evaluated for each load by stress and to evaluate the safety, depending on the test conditions and the criteria of safety standards, the base metal part and each load results confirmed the stress of the welded portion was found to safe.
마찰 교반 용접된 철도 차량용 A6005 압출재의 기계적 성능 향상을 위한 최적 공법 설계
원시태,김원경,Won, Si-Tea,Kim, Weon-Kyong 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.5
Recently, extruded aluminium-alloy panels have been used in the car bodies for the purpose of the light-weight of railway vehicles and FSW(Friction Stir Welding), which is superior to the arc weldings, has been applied in the railway vehicles. This paper presents the optimum design of the FSW process on A6005 extruded alloy for railway vehicles to improve its mechanical properties. Rotational speed, welding speed and tilting angle of the tool tip were chosen as design parameters. Three objective functions were determined; maximizing the tensile strength, minimizing the hardness and maximizing the difference between the normalized tensile strength and hardness. The tensile tests and the hardness tests for fifteen FSW experiments were carried out according to the central composite design table. Recursive model functions on three characteristic values, such as the tensile strength, the hardness difference(${\Delta}Hv$) and the difference of normalized tensile strength and ${\Delta}Hv$, were estimated according to the classical response surface analysis methodology. The reliability of each recursive function was verified by F-test using the analysis of variance table. Sensitivity analysis on each characteristic value was done. Finally, the optimum values of three design parameters were found using Sequential Quadratic Programming algorithm.
비파괴평가기술을 이용한 유리기지 복합재료의 손상 모니터
김정국(Jeongguk Kim),백광선(Kwangsun Baik),김원경(Weon-Kyong Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Two types of nondestructive evaluation (NDE) methods, such as infrared (IR) thermography and acoustic emission (AE) techniques, were used for the damage analyses during tensile testing of Nextel fiber reinforced Blackglas matrix composites. During tensile testing, AE sensors and an IR camera were used for in-situ monitoring of the progressive damages of the samples. AE provided the amounts of damage evolution in terms of the AE intensity and/or energy, and the IR camera was used to obtain the temperature changes during the test. Microstructural characterization using scanning electron microscopy (SEM) was performed to investigate the fracture mechanisms and modes of Nextel/Blackglas samples. Moreover, SEM characterization results provided the substantial evidence of failure behavior, and showed comparable results with NDE signatures.
김정국(Jeongguk Kim),김원경(Weon-Kyong Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The tension behavior of Nicalon/CAS glass-ceramic matrix composites was investigated. Infrared (IR) thermography was employed for two different types of Nicalon™/CAS composites, i.e., cross-ply and unidirectional specimens. During tensile testing, an IR camera was used for in-situ monitoring of progressive damages of Nicalon™/CAS samples. The IR camera provided the temperature changes during tensile testing. Microstructural characterization using scanning electron microscopy (SEM) was performed to investigate the fracture mechanisms of Nicalon™/CAS composites. In this investigation, the thermographic NDE technique was used to facilitate a better understanding of the fracture mechanisms of the Nicalon™/CAS composites during tensile testing.
온정근(Ohn Jung-Ghun),김명룡(Kim Myung-Yong),김원경(Kim Weon-Kyong),홍용기(Hong Yong-Ki) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Battery of rolling stock is a very important device as power supply at starting and emergency control. This paper analyzes the quality of Ni-Cd battery by means of performance test. Ni-Cd battery have suitable and stable properties. That is very stable to discharge on low temperature state and very easy to manage and repair. This paper confirm the performance and property of Ni-Cd battery on low temperature environment by the performance test and estimate the life-cycle of Ni-Cd battery on board at rolling-stock by the life-test and the using-test.