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구동장치에 의한 회전토크와 상대변위의 영향을 받는 연결샤프트 내구시험 평가
김우진(Woo-Jin Kim),송시엽(See-Yeob Song) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
철도차량의 구동장치는 구동모터에 의해서 고속회전하며 이로인한 회전토크가 발생하게 된다. 모터감속기와 차축감속기가 각각 별도로 있는 구동장치는 모터로부터 받는 회전토크를 1차로 모터감속기에 전달을 하며, 모터감속기에서 나오는 회전력과 회전토크를 연결샤프트를 통하여 2차로 차축감속기에 전달하게 된다. 국내 고속철도의 경우 모터감속기는 차체에 취부되어 있고, 차축감속기는 대차프레임의 차축 연결이 되어 있어 주행 중 동적거동에 의해 상대변위가 발생하게 되며, 이 변위는 1차, 2차 스프링의 스프링강성(k)에 의해서 변위량이 결정된다. 따라서 연결샤프트는 차축감속기로부터 받는 회전토크와 상대변위에 의한 저항력을 받게 된다. 이에 본 논문에서는 이러한 조건을 반영하여 연결샤프트의 적절한 내구시험의 방법을 고찰하고자 한다. Driving gear unit for rolling stock is driven by a high-speed rotation from motor and generates the rotational torque simultaneously. The rotational torque from traction motor are transmitted to the motor reduction unit at first and then to the axle reduction unit through the shaft. In case of the domestic high-speed train the motor reduction unit is mounted to the carbody, and the axle reduction unit is connected to the axle of the bogie frame and this condition makes relative displacement by dynamic behavior during train running. The relative displacement is able to be taken from the spring stiffness(k) of the primary, the secondary spring. Therefore, the shaft is effected the resistance due to the rotational torque and relative displacement. We investigated the methods of the appropriate endurance test for the shaft to reflect this condition in this paper.
UIC code에 따른 대차 프레임 구조해석 및 시험에 관한 연구
최중호(Choi Joong-Ho),송시엽(Song See-Yeob),천홍정(Chun Hong-Yong),전형용(Jeon Hyung-Yong),박형순(Park Hyung-Soon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
This report is the result performed the structural analysis and the static and fatigue load test of bogie frame for the purpose of designing and verifying the bogie frame which satisfy the load condition required in the UIC code. This investigation is proposed the efficient draft of the design to satisfy the load condition required in the UIC code. And It is performed the structural analysis to evaluate the static strength and the fatigue life of the patient material and the welded part. Also, This is proposed the efficient draft of the test to satisfy the method of the static and fatigue test required in the UIC code. And it is carried out the sta-ic and the fatigue load test to verify it. We can designed the bogie frame in compliance with UIC 515-4 and 615-4 code.
한정우(Jeong Woo Han),김흥섭(Heung Sub Kim),방제성(Je Sung Bang),송시엽(See Yeob Song) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.7
본 논문은 도시형 자기부상열차에 사용되는 대차프레임의 피로강도를 평가하는 방법을 제안하였다. 가상의 하중 시나리오로부터 구조해석을 수행하여 응력해석결과를 Goodman 선도상의 피로한계선도와 비교하였으며, UIC 규격에 적용되는 3단계의 피로조건을 적용하여 피로누적손상도(cumulative fatigue damge, D)를 계산하였다. 피로해석결과, Goodman 선도상에서 대차 프레임 사용소재인 A6005 알루미늄합금 Butt 용접부의 피로한계선도를 초과하지 않았다. 가장 높은 피로손상도는 캐스팅 블록 및 전자석 폴 연결부로서 1x10<SUP>7</SUP> cycles 기준으로 D=0.808로 계산되어 파손기준을 초과하지 않음을 확인하였다. 피로해석과 동일 조건으로 실시된 수직, 좌우, 전후 방향의 피로시험에서 대차 프레임의 어느 위치에서도 균열이 발생되지 않았으며, 이는 피로안전측으로 계산된 해석결과와 부합되는 결과이다. This study evaluated the fatigue strength of the bogie frame of an urban maglev train through fatigue analysis, cumulative damage, and fatigue tests based on a proposed fatigue evaluation method. The results of FEM analysis in which various load combinations were adopted showed that all data were under the fatigue limit of a butt welded joint made of A6005 in a Goodman diagram. The cumulative fatigue damage was calculated at the highest level from a bolt connecting the area of the electromagnetic pole in the casting block; however, the total sum was evaluated as D=0.808 based on 1×10<SUP>7</SUP>cycles, which indicates that it did not exceed the failure criteria. In addition, the results of the fatigue testshowed that there was no crack at any position in the bogie frame, which corresponded to the results of fatigue analyses.
원공배열 결정에 최적기준법에 의한 전동차 크로스 빔의 위상최적화에 관한 연구
전형용(Jeon Hyung-Yong),천홍정(Chun Hong-Jeong),송시엽(Song See-Yeob),최중호(Choi Joong-Ho) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Electric vehicle body has to be subjected to uniform load and requires auxiliary equipment such as air pipe and electric wire pipe. Especially, the cross beam supports the weight of passenger and electrical equipments. a lightweight vehicle body is salutary to save operating costs and fuel consumption. Therefore this study is to perform the size and the shape optimization of cross beam for electric vehicle using the method of topology optimization to introduce the concept of homogenization based on optimality criteria method which is efficient for the problem having the number of design variables and a few boundary condition. this provides the method to determine the optimum position and shape of circular hole in the cross beam and then can achieve the optimal design to reduce weight.
황동황(Hwang Dong-Hwang),최중호(Choi Joong-Ho),송시엽(Song See-Yeob) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Nowadays domestic demands for urban EMUs are gradually increased due to traffic jams and environmental problems. Therefore it has been required to make sure of manufacturing quality and to acquire cost effective bogie frames through mass production. One of the major functions of bogie frames is to guarantee the static strength and durability. In this research, the comparison between FE analysis and actual load test results is performed for the bogie frame, which is manufactured by Rotem Company. The results show that the standardized bogie frame meets the strength requirements of domestic regulations.