• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.66-72
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• 2009

In order to forecast the progress of the track irregularity, we should observe the long-term track quality and divide a track into some separated divisions which have homogeneous property. For this, we define the division of track which has homogeneous property as a 'Segment' and manage the 'TQI(Track Quality Index)' using track induction data based on each segment. In this study, we introduce some methods of estimating track quality and figure out the TQIs of sample section using new FRA TQI method. In addition, we conducted a basic study of the forecasting model for the progress of track irregularity by analyzing track maintenance data.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 추계학술대회 논문집
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• pp.450-457
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• 2000

This paper establishes a scheme to estimate track quality using standard deviation and deterioration rate of track irregularities. To provide index of quality, standard deviation and deterioration rate of track irregularities are analyed. As an index, standard deviation and deterioration rate were applied to decision of corrective maintenance and replacement maintenance, respectively. Further, this paper proposes a basic scheme for a modernization of mechanize track maintenance that using MTT(Multiple Tie Tamper) and Ballast Cleaner.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.419-431
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• 2007

The track and rail surface geometry is of prime importance on the requirement for track dynamic stiffness, particularly for the speed of 350 km/h, for which both the requirement for fatigue and tensile strength limits require a lower stiffness than 100 kN/mm, which is near the value for ballasted track. However, the track quality has been considered as being the same for 350 km/h as that for 300 km/h, and based on ballasted track, and the track geometry may be kept in better condition with a slab track(probably more similar to the medium quality track geometry of ballasted track). In conclusion, under the condition that the track geometry quality provided by the concrete slab system is fairly good, and that the required maintenance is applied to the rail surface, there would be no safety risk if the fastening system point stiffness reaches 160 kN/mm for 300 km/h operation, and 110 N/mm at 350 km/h.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2163-2173
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• 2011

In this study, the deformations and stresses occurred in the elastic rail fastening system were evaluated according to applied extreme track forces based on various field conditions, track curvature and poor properties. The purpose of this study is to establish a method for efficient management and suggest guide line for track construction in order to secure the performance quality of the elastic rail fastening system on the sharp curved track.. Therefore, initial construction qualities of rail and concrete bed, initial clamping force and applied extreme track forces were used into experiment as several parameters. Using these test results, the performance characteristics of the elastic rail fastening system were also evaluated. As a result, it suggested the method to secure long-term durability of fastening system and comparing sharp curved track to results on field test.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.213-218
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• 2002

A new German high speed railway slab track was investigated. The construction objective was to provide a durable and maintenance free track system consisting of precast concretepanels of consistently high quality and highest achievable accuracy in track geometry. The System on the basis of precast panels similar to the slab track system constructed on the line Dachau- Karlsfeld in 1997.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.1320-1325
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• 2006

Railway track supports and guides train and it directly affects ride quality and safety. To maintain track quality, regular maintenance activity is essential but it degrades track usage since maintenance activity occupies the track during the work. To achieve maximum track efficiency, track inspection should be performed at commercial running speed. In this paper, we designed and developed high speed rail profile measurement system using laser light sectioning method with line laser generator, digital camera and DSP based image processing system. The measurement system can supports rail profile measurement at the speed of 300 Km/h that can be applied to KTX.

• 한국철도학회논문집
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• 제12권1호
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• pp.55-64
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• 2009

콘크리트궤도는 유지보수상의 장점으로 인하여 자갈궤도를 급속히 대체하고 있다. 반면에 보수보강이 어렵기 때문에 매우 엄격한 설계와 시공기술이 필요하며 이러한 기술을 만족하기 위해서는 평가기술 또한 뒷받침이 되어야 한다. 본 논문에서는 이와 같이 시공 및 유지보수의 핀 평가기술을 확보하기 위한 방안으로서 탄성파를 이용하는 비파괴조사기법을 다양하게 적용하였다. 사용된 기법은 SASW시험, 임팩트에코시험, 연속임팩트에코시험이다. 시험은 49개의 프리캐스트 판넬의 강성구조와 충진성능을 평가하는 목적으로 총 5,353회에 걸쳐 수행되었다. 적용 결과, 콘크리트재료 자체의 비균질성으로 인하여 탄성파시험의 적용 및 분석이 제한적이지만 본 논문에서 목적하는 슬래브의 강성구조과 충전성(공극)에 대한 신뢰성 있는 조사 결과를 얻을 수 있을 것으로 나타났다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.311-319
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• 2011

Track accompanies the process that track alignment by traffic loads is changed. A change of track alignment affects the running safety and riding comfort of train. This is called a track irregularity. The most important task in maintaining the track is to manage these track irregularity within quality parameters. Today, track maintenance of urban transit is enforcing immediate maintenance about section exceeding a safety standard by applying track recording data got through Integrated Measurement. This method is advantage of being easy of the maintenance assesment in case of the running safety, but is disadvantage of being difficult in case of the riding comfort of train. In this study, we propose track irregularity deviation of each track system depending on the time series and present about utilization plans of the Track Irregularity Progress Rate.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2400-2404
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• 2011

Power spectral density (PSD) model of irregularities for the maglev test track is presented. Track irregularities (gauge, cant, twist and vertical) were calculated from the survey data of sleepers on the test track. PSD model was constructed from the estimated PSDs of each track irregularities. Versine (gauge, cant, twist, vertical and lateral) of the track is obtained and their PSDs were estimated, too. Presented PSD model can be used for the analysis of levitation stability and ride quality of the maglev system.

• 한국구조물진단유지관리공학회 논문집
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• 제28권4호
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• pp.37-47
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• 2024

이 연구에서는 철도 궤도의 수명주기비용(life cycle cost, LCC)를 보다 합리적으로 평가하기 위하여 실제 경부고속철도의 궤도 유지보수 데이터를 이용하여 열차 하중의 반복에 따른 레일의 피로 손상과 자갈 침하 진전을 고려한 궤도 보수량 추정 모델을 제시하여 기존 궤도 LCC 모델을 수정 보완하고 이 모델을 이용하여 궤도 품질수준에 따른 유지보수량과 수명주기비용을 분석하였다. 연구결과에 따르면 레일의 피로 손상 진전과 자갈 침하 진전을 고려한 궤도 보수량 추정모델을 적용한 결과 유지보수비를 실제 유지보수 비용에 가깝게 합리적으로 산정할 수 있음을 확인하였다. 궤도품질 영향계수는 레일 보수량 및 자갈다짐 보수량 그리고 결과적으로 유지보수비에도 상당한 영향을 미치고, 레일 보수량 보다 자갈다짐 보수량에 더 큰 영향을 미치는 것으로 나타났다. 또한 열차속도가 증가하면 레일 보수량과 자갈다짐 보수량이 증가하고, 궤도품질 영향계수가 클수록 열차속도에 따른 보수량의 증가율이 더 커지는 것으로 나타났다. 이에 따라 LCC 또한 궤도품질 영향계수가 클수록 열차속도가 커질수록 시간에 따른 증가속도가 빠르고, 유지보수비가 차지하는 비중이 증가하는 것으로 나타났다.