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휠 레일 간 접촉력의 안정화를 위한 모델링기법에 관한 연구
조현직(Hyunjik Cho) 한국철도학회 2012 한국철도학회 학술발표대회논문집 Vol.2012 No.5
EU에서 국가 간 운행되는 고속차량에 대한 관리규정인 TSI(Technical Specification for Interoperability)에서는 차량 간 타고오름에 대한 평가기준이 명시되어 있다. [1] 해당 조항을 살펴보면 정면 수직방향으로 40mm 어긋난 상태로 정면충돌 시 각대차 당 최소한 하나의 윤축이 선로와의 접촉을 유지하고, 생존공간변형과 감속도 제한조건을 만족시켜야 한다(2008). 해당규정의 평가에 있어 휠-레일 간 접촉여부를 판단하는 인자로써 수직 접촉력을 활용할 수 있으며, 이를 위해서는 유한요호고 구성된 휠-레일 간 접촉점에서 발생하는 접촉력의 동적 오실레이션을 안정화 시키는 것은 반드시 필요하다. 본 논문에서는 활용가능한 동적오실레이션 제어기법을 소개하고자 한다. According to the TSI(Technical Specification for Interoperability) the acceptance criterion for the overriding limitation are that an additional simulation of scenario l demonstrates that under the initial vertical offset conditions of 40 mm no lifting of all wheel sets of any bogie occurs and that survival space and deceleration limit requirements are maintained. These criteria alone are sufficient for the validation of overriding resistance. To evaluate that, it is a useful method to analyze wheel-rail contact force using finite element model. But penalty method makes dynamic oscillation due to gravity effect. In this paper I introduced two simple methods to solve these problems and applied to wheel-rail contact model.
외연적 유한요소법을 이용한 자동차 Hub Bearing의 Orbital forming 해석
조현직(Hyunjik Cho),구정서(Jeongseo Koo),배원락(Wonrak Bae),임종순(Jongsoon Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper was analysed the orbital forming of an automotive hub bearing using the explicit finite element method. To find an efficient solution technique on the orbital forming, axisymmetric finite element model s and 3D solid element models were solved and compared numerically. The time scaling and mass scaling techniques were used to reduce long computational time for fine element models in case of using the explicit finite element method. It was found from the numerical results that the axisymmetric element models showed the similar results to the 3D solid element models in forming loads whereas the deformations of them caused by O/F were quite different.
철도차량 안전기준에 의한 KTX 산천 차량의 충돌안전성능 평가
조현직(Hyunjik Cho),구정서(Jeongseo Koo),이장욱(Jangwook Lee),박근수(Geunsu Park),우관제(Kwanje Woo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, the crashworthiness of the KTX Sancheon was evaluated under the domestic safety regulation for high speed rollingstock. There are two serious collision scenarios to evaluate crashworthy performance. One is a train-to-train collision at 36 ㎞/h, and the other is a large obstacle-to-train at 110 ㎞/h. The KTX Sancheon turned to satisfy the performance requirements of the domestic safety regulation. That is, the deceleration caused by two collision scenarios remained under the allowable limits of the maximum 7.5g and average 5g. There did not also occurred a remarkable deformation in the survival spaces such as deriver"s and passenger"s rooms.
고속전철표준편성차량의 충돌 동역학해석 모델개발과 에너지흡수 사양도출 연구
조현직(Hyunjik Cho),박민영(Minyoung Park),구정서(Jeongseo Koo),권태수(Taesoo Kwon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is for the introduction of the crashworthiness design analysis and the evaluation of the collision energy absorption capacity in the standardized consist high speed train. An intensive study was conducted for the crashworthiness structural design of recently developed Korean High Speed Train. To research such a study, we have to consider the reference scenarios and the standardized consist trainset first, and then get crash characteristic data of each parts using 3D finite element analysis. Through these procedure the Standardized consist trainset model using 1-0 elements to evaluate crash energy absorption ability was developed. For this model we use to establish a initial design guideline for crashworthiness parts and train section. To analysis another interest fields for example overriding and vertical dynamic characteristic etc, we could use the 2-D modified dynamic model based on 1-D method.
동력집중식 고속열차의 충돌안전도 표준설계가이드라인에 관한 연구
김거영(Geoyoung Kim),조현직(Hyunjik Cho),구정서(Jeongseo Koo),권태수(Taesoo Kwon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper studied on the standard design guidelines of high speed train with power car to meet the crashworthiness requirements of the Korean rollingstock safety regulation. The regulation calls for some performance requirements for two heavy collision accident scenarios; a train-to-train collision at the relative speed of 36 kph, and a collision against a standard deformable obstacle of 15 ton at 110 kph. A standard train consist was chosen as 2PC-2ET-6T with 17ton axle load. similar to KTX-2 for the Honam express line. Using theoretical and numerical analyses, some crashworthy design guidelines were derived in terms of mean crush force and energy absorption for principal crushable components. The derived design guidelines were evaluated using one dimensional spring-mass dynamic simulation. It is shown from the simulation results that the suggested design guidelines can satisfy the domestic crashworthiness requirements easily.