• 한국철도학회논문집
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• 제17권3호
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• pp.193-200
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• 2014

본 연구에서는 도시철도 콘크리트궤도 장대레일에 대한 실내피로시험을 수행하였고, 장대레일 잔존수명을 표현한 파괴확률 50% S-N 선도는 적은 실험데이터에 대한 가중치 확률 해석기법을 사용하여 도출하였다. 여기서 피로시험에 사용된 레일들이 누적통과톤수가 서로 다르기 때문에 누적통과톤수를 평균하여 반복횟수를 수정하였다. 또한, 레일표면요철 및 열차속도를 고려한 레일 저부 휨응력은 기존 연구결과 도출된 레일휨응력 예측식을 사용하여 콘크리트궤도 장대레일의 잔존수명을 평가하였다. 레일 피로수명 평가결과, 레일 피로수명이 기준치에 비해 약 2억톤이상 높았다. 또한, 자갈궤도에 비해 콘크리트궤도 레일의 피로수명이 약 3억톤이상 높은 것으로 분석되었다. 따라서 도시철도에서 레일교체기준을 자갈궤도와 콘크리트궤도로 구분할 필요가 있으며, 레일연마를 통한 레일관리가 이루어진다면 기준치가 아닌 목표치로 관리할 수 있을 것으로 판단되었다.

• 한국철도학회논문집
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• 제20권5호
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• pp.649-657
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• 2017

본 연구의 목적은 궤도형식별로 사용레일의 피로수명을 평가하는 것이다. 이를 위해 궤도형식별 사용레일에 대한 실내피로시험을 수행하여 파괴확률 50%~0.01% 의 S-N 선도를 도출하고, 실험데이터에 대한 가중치 확률해석기법을 사용하여 피로수명을 산출하였다. 여기서, 레일표면요철 및 열차속도를 고려한 사용레일의 휨응력은 기존 연구결과 도출된 레일휨응력 예측식을 이용하여 구하고, S-N 선도로부터 사용레일의 잔존수명을 평가하였다. 평가결과, 자갈도상의 경우 레일의 피로수명이 현 레일교환기준에 비해 약 2억톤 이상 높았고, 콘크리트도상의 레일 피로수명이 자갈궤도에 비해 약 3억톤 이상 높은 것으로 나타났다. 따라서 누적통과톤수에 의한 레일교환기준을 자갈궤도와 콘크리트궤도로 구분할 필요가 있으며, 레일연마를 통한 레일관리가 이루어진다면 기준값이 아닌 목표값으로 관리할 필요가 있다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 춘계학술대회논문집
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• pp.988-991
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• 2006

Rolling Stock running are making Rail Head Surface damage(corrugation, flaking, shelling, etc). It's coming out Rail Head Surface Irregularity. It increases Rolling Stock and structure vibration. Therefore, this paper analyzes the influence of Rail Head Surface Irregularity to railway vibration. And, It introduces the management method of Rail Head Surface and proposes its R&D direction in railway-run organization.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.255-261
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• 2008

The importance of maintenance of rail surface defects is increasing according to the KTX operation. That is because during high speed operation of rolling stocks, rail surface defects shorten fatigue life of rail, accelerate track degradation and deteriorate ride comfort. Rail grinding has been applied for effective rail maintenance in Kyeong-Bu HS line. This paper evaluates the effectiveness of rail grinding in term of rail fatigue life. To this end, the stresses of the ground rail are measured under KTX running and the equivalent stress range is calculated by RMC after the frequency analysis done with Rainflow counting method. Also, Pamglen-Miner rule is applied to predict the fatigue life of ground rail. The result of the analysis shows that the fatigue life of ground rail is increased by 15%.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.283-289
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• 2004

Rail defects(Corrugation, shelling, etc) are occurred by the Rail with wheel contact stress. Rail grinding is maintaining of optimal rail profile to use special rail grinding machine to remove rail defect. The benefits of rail grinding enforcement, improve track safety, improve track steering and rail life, improve ride comfort and reduce noise, etc. Actually when rail grinding plan apply to field track, we should consider a lot of function before determination, such as grinding method, grinding pass number, removing metal volume, etc. because each track has various characteristics. Therefore it is important that the determination of rail grinding strategy for optimum and economic before enforcement.

• 한국철도학회논문집
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• 제18권6호
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• pp.578-585
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• 2015

궤도의 탄성 구성요소는 기술적 및 경제적으로 효율적인 철도 네트워크를 위해 궤도상부구조로 잘 통합될 수 있다. 탄성 레일패드는 곡선반경이 800m보다 큰 경우 부드러운 레일지점과 고속(160km/h 이상)을 제공한다. 높은 궤도저항성은 눈에 띄게 다짐주기를 연장시킨다. 침목패드의 꾸준히 증가된 점유율은 향상된 다짐주기와 연마주기를 제공하고, 좁은 곡선반경에서도 기술적인 철도구조물 그리고 고체음의 감소에 대한 대책을 제공하기 때문이다. 밸러스트 매트의 설치는 신설선 건설 또는 광범위한 혁신 조치의 차원에서 특히 방진 및 구조물 보호와 같은 좋은 효과를 준다. 다만, 적절한 설치에는 세심한 주의가 필요하다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2115-2124
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• 2011

The rail surface defects which are generated on repeated rolling contact fatigue are getting increased according to high speed, high density, and minimum weight. In addition, Increasing noise and vibration are affected by these also impact load generated as well. Because of this phenomenon, more serious and critical damages were occurred. In fact, in order to control them, the rail grinding were conducted. However, there are not enough researches to make an criteria of generating optimal rail grinding amount in Korea. This study evaluated how depth of hardening on rail surface is formed and suggested optimal rail grinding amount by RCF(rolling contact fatigue) test with generated contact pressure between KTX wheel and UIC60 rail by applying FEM analysis. Therefore, the amount was generated approximately 0.2mm/20MGT to maintain integrity of rail surface by getting rid of depth of hardening on rail according to rail accumulated passing tonnage.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.684-691
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• 2010

Rail is one of major track components for train service, it should be provided in the condition of flat and smooth driving aspect. Therefore, it is inevitable that there would be the field welding to integrate on CWR(Continuous Welded Rail) removing rail joint in these days. It is high chance to be some rail surface irregularity due to the limitation on the status of work condition If a high speed train runs on the rail surface irregularity in the welding part, big impact load comes to pass on that, so track irregularity cycle is reduced, therefore track maintenance cost can be increased. this paper has analyzed wheel load variation according to removing the rail surface irregularity using portable grinding machine in the high speed line. The result measured before and after in the field is decreased about 9.26% on the wheel load variation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.377-385
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• 2007

The importance of maintenance of rail surface defects is increasing more according to the KTX operation. That is because during high speed operation of rolling stock, rail surface defects may cause shortened fatigue life of rail, acceleration of track degradation and reduced ride comfort. The paper was intended to study the establishment of rail grinding criteria of high-speed railway lines considering the KTX operation circumstances. For this, the specimens of UIC 60 rail on Kyeong-Bu high-speed operation lines were collected and they were analyzed for metallographic structure and tested for the hardness. By analyzing the test results to the factors affecting the RCF causing the defects of rail surface, the study suggested the rail grinding criteria of the domestic high speed railway lines. As the factors affecting RCF, passing tonnage, running speed and track condition are considered.