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비선형 점탄성 스프링 모델을 이용한 플로팅 슬래브 궤도의 동적 거동 해석
장승엽(Jang, Seung Yup),박진철(Park, Jin Chul),황성호(Hwang, Sung Ho),김은(Kim, Eun) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.11
Recently, the vibration and structure-borne noise induced by passing trains are of great concerns, and the floating slab track is highlighted as one of most efficient alternatives to reduce the railway vibration. However, due to the non-linearity and viscosity of rubber spring used in the floating slab track, its dynamic behavior is very complex. In this study, therefore, to simulate the dynamic behavior of floating slab track with a better accuracy, a nonlinear viscoelastic rubber spring model that can be incorporated in commercial finite element analysis codes has been proposed. This model is composed of a combination of elastic spring element, friction element and viscous element, and termed the 'generalized friction viscoelastic model(GFVM)'. Also, in this study, the method to determine the model parameters of GFVM based on Berg's 5-parameter model was presented. The results of the finite element analysis with this rubber spring model exhibit very good correlation with the test results of a laboratory mock-up test, and the feasibility of GFVM has been verified.
도시형 자기부상열차 굴절식 분기기의 선형 요구조건 분석
장승엽(Jang Seung Yup),황성호(Hwang Sung Ho) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
For the commercialization of the urban maglev, an articulated turnout which consists of several segments of turnout girders and where switching is done by rotating those segments is under development. In this paper, to determine the alignment of this articulated turnout, the requirements for the alignement are analyzed. Requirements include: those for the levitation control and for the ride comfort. For the levitation control, rail joint width should be limited to a certain value, and for the ride comfort, the lateral acceleration and the time derivative of the lateral acceleration satisfy a guideline. According to these requirements, the alignment criteria are discussed.
내구성 설계 변수의 변화에 따른 목표내구수명을 위한 최적 고로슬래그 미분말 치환률의 도출
장승엽 ( Jang Seung Yup ),윤용식 ( Yoon Yong Sik ),이학수 ( Lee Hak Soo ),황상현 ( Hwang Sang Hyeon ),권성준 ( Kwon Seung Jun ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
In this paper, the changing of durability design variables such as cover depth, surface chloride content, and replacement ratio of GGBFS are considered, and optimum substitution ratio of GGBFS are derived with intended service life. With increasing cover depth, service life increased by 2.78~3.21 times. Cover depth is the most influencing parameters of those in this study. For reasonable durability design of concrete, quantitative exterior condition and critical chloride content should be determined.
차륜-레일형 초고속 철도의 주행 안전 및 승차감 평가 기초 연구
황성호(Sung Ho Hwang),장승엽(Seung Yup Jang),양신추(Sin Chu Yang) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11
최근 차륜-레일 형식으로 초고속 철도를 실현하기 위한 기초 연구가 추진되고 있다. 이 연구에서는 기초 연구로 1 축 대차, 경량 차체 등이 고려된 차량 모델을 적용한 차량-궤도 동적 상호작용 해석을 통해 레일형 초고속 철도의 동적 거동을 예측하고, 주행 안전을 평가하였다. 궤도틀림의 영향을 고려하기 위하여 경부고속철도 콘크리트궤도 구간에서 계측된 면틀림 데이터로부터 구한 궤도틀림 PSD 를 모델에 반영하였다. 해석 결과는 1축 대차 적용 시 윤중 변동이 감소하지만, 이보다는 궤도틀림의 영향이 더 지배적이며, 초고속 대역에서 주행 안전을 확보하려면 궤도틀림을 더 낮은 수준으로 관리해야 한다는 점을 시사하고 있다. Recently a preliminary study on the wheel-on-rail ultra-high speed railway is ongoing. This paper aims to evaluate the running safety and ride comfort, by predicting the dynamic behavior of ultrahigh-speed train from the train-track interaction analysis considering the train model with 1-axle bogie and light car body. To take into account for the impact of track irregularity, the vertical track irregularity PSD obtained at the concrete slab track of Kyeong-Bu high speed line. The result shows that the use of 1-axle bogie reduces the fluctuation of wheel load, but the impact of track irregularity on the wheel load variation is greater, which suggests that track irregularity should be maintained with stricter standards.
장경간 철도 교량에 적용된 슬라이딩 궤도와 레일신축이음장치의 궤도-교량 상호작용 비교
이경찬,장승엽,이정휘,최현성,Lee, Kyoung Chan,Jang, Seung Yup,Lee, Jungwhee,Choi, Hyun Sung 한국전산구조공학회 2016 한국전산구조공학회논문집 Vol.29 No.2
슬라이딩 궤도는 콘크리트 궤도와 교량 바닥판 사이에 저마찰 슬라이드층을 두어 레일신축이음장치와 같은 특수 장치를 적용하지 않고도 궤도-교량 상호작용 효과를 효과적으로 저감시킬 수 있는 새로운 궤도 시스템으로 개발되고 있다. 이 논문에서는 장경간 교량에 슬라이딩 궤도와 레일신축이음장치를 각각 적용한 경우에 대하여 궤도-교량 상호작용해석을 수행하고 그 결과를 비교 검토하였다. 대상교량은 상호작용 효과를 극대화하기 위하여 9경간 연속 PSC교와 2경간 연속 강합성교를 포함하며, 총 연장 1,205m, 최대 고정지점간 거리 825m인 장경간 교량을 선정하였다. 해석결과 슬라이딩 궤도는 레일신축이음장치를 적용한 경우보다 레일 부가 축력이 더 작은 것은 물론, 지점부에 재하되는 수평 반력 또한 작게 나타나 궤도-교량 상호작용 저감 효과가 뛰어난 것으로 확인되었다. 반면 슬라이딩 궤도는 온도하중에 의해 높은 슬래브 축력이 발생되므로, 궤도 설계 시 슬래브 축력에 대한 단면 설계에 주의를 기울일 필요가 있다. Sliding slab track system, which consists of low friction sliding layer between track slab and bridge deck, is recently devised to reduce track-bridge interaction effect of continuously welded rail(CWR) without applying special devices such as rail expansion joint(REJ). In this study, a series of track-bridge interaction analyses of a long-span bridge with sliding slab track and REJ are performed respectively and the results are compared. The bridge model includes PSC box girder bridge with 9 continuous spans, and steel-concrete composite girder bridge with 2 continuous spans. The total length of the bridge model is 1,205m, and the maximum spacing between the two fixed supports is 825m. Analyses results showed that the sliding slab track system is highly effective on interaction reduction since lower rail additional axial stress is resulted than REJ application. Additionally, horizontal reaction forces in fixed supports were also reduced compared to the results of REJ application. However, higher slab axial forces were developed in the sliding slab track due to the temperature load. Therefore, track slab section of the sliding slab track system should be carefully designed against slab axial forces.
박상곤(Sang Gon Park),구형욱(Hyung wook Koo),한현희(Hyun Hee Han),전종균(Chong Keun Chun),장승엽(Seung Yup Jang) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
Recently the construction of stations under railway lines and railway sections passing through central area of cities are increasing, calling for an urgent establishment of countermeasures against railway vibration and its subsequent second-phase noise. Of technology developed up to now, the most efficient countermeasure is the floating slab track, a track system isolated from the sub-structure by springs. Developed in this study, anti-vibration device for floating slab track (HLRM-High Load Rubber Mount) Haman station affiliated to the primary measurement was conducted in October 2012, one year after the second measurement after 2013 to be carried out in November and we want to change that. It is expected to raise awareness for the need of technology self-support and to make a meaningful contribution to mitigating vibration and noise produced by the next-generation high-speed railway.