RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      • 좁혀본 항목

      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
          • 원문제공처
          • 등재정보
          • 학술지명
          • 주제분류
          • 발행연도
          • 작성언어
          • 저자

        오늘 본 자료

        • 오늘 본 자료가 없습니다.
        더보기
        • 무료
        • 기관 내 무료
        • 유료
        • KCI등재

          기후변화에 대비한 장대레일 온도특성 연구

          최진유(Jin-Yu Choi),이규세(Gyu-Sei Yi),배현웅(Hyun-Ung Bae),박범호(Beom-Ho Park),임남형(Nam-Hyoung Lim) 한국철도학회 2010 한국철도학회논문집 Vol.13 No.2

          장대레일 좌굴과 파단에 대한 안정성을 확보하고 효율적인 유지관리를 위해서는 레일온도의 특징을 파악하는 것이 매우 중요하다. 최근 들어, 기후변화에 의해 여름철 최고 대기온도는 상승하고 겨울철 최저 대기온도는 점점 하강하고 있다. 이러한 현상은 연간 레일온도의 변화량에 영향을 미치게 되고 설정온도와 관리온도의 변화를 일으킬 수 있다. 본 연구에서는 기후 및 온도 측정시스템을 구축하여 기후요소를 포함한 레일온도를 실측하였다. 실측자료의 심층적인 분석을 통하여, 기존 레일온도 추정식은 특정한 조건(기후요소들의 특정 조합)에서만 적용이 가능함을 알 수 있었다. 현장의 실제 기후요소를 고려한 레일온도를 확률론적 접근으로 예측하는 것이 더욱 합리적일 것이다. In order to secure safety for the buckling and fracture of continuous welded rail and improve the efficiency of maintenance work, it is very important that grasp the characteristics of rail temperature. Recently, the maximum air temperature in summer season rises gradually and the minimum air temperature in winter season is decreasing gradually due to the climate change. Therefore, these phenomenon influences in the change amount of yearly rail temperature and can cause change of laying and maintenance temperature. In this study, actual measurement of rail temperature including climatic factors is carried out by constructing the temperature and climate measurement system as realistic as possible. Through the intensive investigation of actual data, it is founded that the existing prediction formulas for rail temperature may be used only in certain climatic conditions (certain combination of climatic factors). It may be more reasonable that the rail temperature considering actual climatic factors in site is predicted on probabilistic approach.

        • KCI등재
        • 레일패드의 강성이 자갈궤도 침하에 미치는 영향 연구

          최진유(Choi Jin-Yu),김은(Kim Eun),황만호(Hwang Man-Ho),조수익(Cho Su-Ik) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7

          Ballasted track is under the circumstance of repetition of deterioration and recovery. Track deterioration is presented as track irregularity or settlement, and dynamic force subjected to track is one of major cause of the deterioration. The dynamic force is determined from the dynamic interaction between track and vehicle. Rail-pad stiffness is one of the factor affects track dynamic property. In this study, the relationship between rail-pad stiffness and track settlement was investigated. Dynamic forces according to various rail-pad stiffness was obtained from the dynamic vehicle-track interaction analysis using DARTS-NL. Track settlement was calculated by substitution the dynamic forces into various formulas for track settlement. From the result of analysis, it was known that the track settlement is increased about 6% when the rail-pad stiffness rise about twice. And this result leads that there is only a little relationship between rail-pad stiffness and track settlement.

        • 교량신축과 분기기의 이격거리에 따른 교량상 분기기 축력특성 연구

          최진유(Choi Jin-Yu),이현정(Lee Hyun-Jeong),양신추(Yang Shin-Chu),정장용(Jeong Jang-Yong),유진영(Yu Jin-Young) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

          The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR with turnout is subjected to additional axial force induced by the thermal expansion of bridge as well as lead rail of turnout. The additional axial force is closely related with the distance between bridge expansion joint and turnout when it is located near the movable bearing of bridge, and it is required to keep some distance to prevent excessive axial stress in CWR. But, there is no guideline in specification for the proper distance from E.J. to turnout, and it caused problem in planning turnout or bridge. So, it this study, the parametric study to investigate the effect on axial stress in CWR with turnout according to span length and distance between bridge expansion joint and turnout was performed. From the results of numerical analysis, it was found out that 5~30m distance is required to prevent excessive axial in CWR for span length less 90m.

        • KCI등재

          콘크리트궤도 부설 교량의 접속슬래브 단부 처짐한도에 관한 연구

          최진유(Jin-Yu Choi),양신추(Shin-Chu Yang) 한국철도학회 2008 한국철도학회논문집 Vol.11 No.2

          교량과 토공의 접속부은 궤도의 대표적인 취약구간으로서 교대배면의 부등침하로 인한 궤도틀림발생이 빈번하여 유지관리에 많은 어려움을 겪고 있는 구간 중의 하나이다. 콘크리트궤도부설구간의 경우에는 교대배면의 부등침하를 방지하기 위하여 접속슬래브 부설이 일반화되고 있는 추세이다. 이 경우, 접속슬래브를 지지하고 있는 노반의 침하로 인하여 접속슬래브에 경사처짐이 발생하게 되면 궤도도 경사처짐이 발생하게 된다. 이로 인해 이 구간을 통과하는 차량의 주행안정성과 승차감의 저하, 그리고 과도한 충격에 의한 궤도의 손상을 유발하게 되므로 접속슬래브의 단부에서의 침하를 제한할 필요가 있다. 따라서 본 연구에서는 콘크리트 궤도 부설 교량과 토공의 접속부에 부설되는 접속슬래브의 단부에서의 처짐한도를 알아보기 위하여 접속슬래브의 길이와 단부처짐량을 매개변수로 한 차량-궤도 상호작용 해석을 실시하여 차체가속도, 윤중변동률, 레일저부응력, 그리고 체결구에 발생하는 상향압력을 조사하였으며, 수치해석결과와 각 검토항목별 허용한도와의 비교검토를 통하여 접속슬래브의 길이에 따른 단부처짐의 허용한도를 제시하였다. The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab could be installed to prevent such a phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and increasing the track deteriorations by excessive impact force acting on the track. In this study, parametric studies were performed to investigate the displacement limit on the approach slab to avoid such problems. The length and the amount of unequal settlement of approach slab were adopted as parameter for numerical analysis considering vehicle-track interaction. Car body accelerations, variations of wheel force, stresses in rail, and uplift forces induced on fastener clip were investigated. From the result, resonable settlement limit on the end of an approach slab according to slab length was suggested.

        • 고속 레일-차륜 접촉시험기 개발

          최진유(Choi Jin-Yu),최일윤(Choi Il-Yun),이준석(Lee Jun-Seok),김태욱(Kim Tae-Wook),이동형(Lee Dong-Hyung),서정원(Seo Jeung-Won) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월

          In recently, rail deteriorations -rolling contact fatigue, wear, etc- arise as hot issue of track maintenance by speed increasing of railway. And the relative importance of the rail maintenance in concrete track, which is adopted as a track system for 2nd phase of Kyung-Bu and Ho-Nam high speed line, will be increased much more. Furthermore the rail maintenance trouble was already serious in Metro by excessive wear of rail profile, and excessive noise in sharp curve line. But effective scheme for the rail maintenance is established yet in our country. To work out such a problem by laboratory test or simulation, the wheel-rail contact simulator was developed. The simulator was developed to test various phenomena on wheel and rail surface by contact of wheel and rail at speed of maximum 400㎞/h using real scale wheel and rail which are also variable. And, using the simulator, it can be investigate deterioration phenomena of wheel and rail under various contact angle, attack angle, running speed, environmental condition, wheel and thrust load condition. The test results using the machine can be used for improvement of profile of wheel and rail, estimation of life period of rail and wheel etc, and, after all, it leads effective maintenance of wheel and rail.

        • 현장계측을 통한 교량상 분기기 축력 분석에 관한 연구

          최진유(Choi Jin Yu),김인재(Kim In Jae),황성호(Hwang Sung Ho),양신추(Yang Shin Chu) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

          The demand on a turnout layed on a bridge is rising owing to the increasing number of stations on the viaduct. And also the demand on a turnout with CWR is rising to upgrade running speed of the passing train. A CWR connected with turnout is subjected to additional axial force induced by the actions due to change in temperature, braking and starting force, and bending of the deck. But magnitude and distribution of the axial force in rails of turnout is not clear yet. So, in this study, a field measurement was conducted to know them. The strain gage method was adopted for field test. The FBG sensor for the strain measurement was used to ensure stability of test value and durability of gage for long term. It is expected that we can get data on the axial force in rail connected with turnout with respect to seasonal temperature change by the established field test system.

        • 콘크리트궤도부설 교량의 접속슬래브 허용변위한도에 관한 연구

          최진유(Choi Jin Yu),양신추(Yang Shin Chu),유진영(Yoo Jin Young),조현철(Cho Hyun Cheol) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-

          The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab is installed to prevent the phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and the deteriorations of track by excessive impact subjected to the track. In this study, parametric studies were performed to know what is the allowable displacement limit on the approach slab to avoid such a bad effect. The length and amount of unequal settlement of the approach slab was adopted as parameter for numerical analysis. And car body accelerations, variations of wheel force and rail stress and uplift force induced on a fastener clip are investigated. From the result, resonable settlement limits of an approach slab according to slab length was suggested.

        • 레일의 단ㆍ장파장 결함에 따른 궤도의 동적응답 변화특성 분석

          최진유(Choi Jin Yu),황만호(Hwang Man Ho),양신추(Yang Shin Chu),황성호(Hwang Sung Ho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-

          A numerical analysis was performed to verify how much additional force is induced by short or long pitch rail corrugations in track. The rail corrugations assumed as sine wave having various pitches and depths. The variation of wheel force, displacement and acceleration of rail and sleeper was investigated. In the results, it was shown that each item of the investigation was increased as the pitches and depths become large. It is expected that the results of the parametric study can be used as a preliminary data for the determination of economical maintenance criteria for rail corrugation in the future.

        맨 위로 스크롤 이동