• 한국철도학회논문집
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• 제7권4호
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• pp.291-295
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• 2004

The Track geometry measuring on High-speed railway is the most important subject for the track construction and track maintenance work. Also the measuring accuracy is so significant part because it provides principle data for the maintenance plan and the assesment of working quality and can control the train speed limitation. From this point of view, it is very important to verify for the track recording coach(EM120) in KNR. According to the result of spectrum analysis, the noise near 1m waveband was found on the track recording data from EM120. So, New filter has been applied to remove the noise form track recording data. and it makes possible to acquire resembling result to real track geometry.

• 한국강구조학회 논문집
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• 제18권1호
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• pp.47-51
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• 2006

고속철도 궤도검측은 공사관리는 물론, 궤도유지관리 측면에서 매우 중요한 과제이며 향후 유지보수 시 작업계획수립, 작업량산출, 열차속도제한 등 유지보수 시 기본적인 자료로 제공되는 만큼 궤도검측치의 정확성은 매우 중요하며, 이러한 관점에서 국내 궤도검측차(EM-120)의 검측성능과 정확성을 검증하고자 하였다. 본 논문에서는 현재 일반철도구간에 대한 궤도검측 시 사용하고 있는 궤도검측차 (EM-120)의 선형검측자료를 Spectrum 분석한 결과, 파장 1m 부근의 검측치에 Noise가 있는 것을 확인할 수 있었다. 또한 이러한 Noise를 제거하기 위해 Spectrum 분석을 통한 새로운 Filter를 적용한 결과 실제 궤도틀림치에 보다 더 근접한 검측결과를 얻을 수 있었으며 사용기간에 따른 틀림전진 경향 또한 파악할 수 있었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1090-1095
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• 2008

Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies use moving chord method, which determine versine values via a chord. The versine is the vertical distance to curve measured in the middle of the chord. This type of method measures only versine of track irregularity curve by transfer function from the characteristics of measuring device. In this report, review the characteristics of two types of measuring tools by comparing the measurements. The one is GRP-1000 system, optical surveying system with Total station and lazar prism trolley. This calculates track geometry by surveying absolute coordinates of two points each on both rail heads. The other is EM-120, measures versine with 10m of symmetrical chord length.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.435-441
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• 2011

Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies in Korea use various track recording equipments to measure track irregularity. But this various equipments output different data due to their geometrical structure even measured at same location. In this report, the correlation of various track recording data used in Korea was reviewed.

• 한국철도학회논문집
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• 제8권2호
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• pp.111-115
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• 2005

The Study provides the technical background and calculation method f3r the long wave track defect. On high speed railway, It is necessary to manage the long wave band up to 80m track defect fur improving a riding quality. For this reason, Track recording methods for highspeed railway are used 10m and 30m recording bases, these are covered middle wave band and long wave band successfully. Extended base recording data is calculated by geometrical model and this data provides a good result for KTX riding index.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.310-314
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• 2010

Track geometry changes by traffic loads. The bigger the changes are, the worse the riding comfort and running stability of train. This is so-called track irregularity and is the most important quality parameters of ballasted track. To objectively assess track irregularity, track geometry should be able to be measured. Practically, railway companies in Korea use normal distribution as probability distribution of track irregularity. But some countries use non-normal distribution according to their own track recording system. In this report, reviewed probability distribution of Kyung-Bu high-speed line and tested normality.

• 한국철도학회논문집
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• 제13권3호
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• pp.304-308
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• 2010

본 연구에서는 웨이브렛 변환을 이용하여 궤도틀림을 식별하는 방법을 제시하였다. 궤도틀림과 대차 가속도응답신호에 의한 등가 웨이브렛 SISO 전달함수를 정의하였다. 현장에 적용되는 검측차의 25cm단위 궤도검측 기준에 맞추어 궤도틀림과 대차가속도 응답신호를 조정하였다. 웨이브렛 변환을 적용하기 전 입력데이터는 웨이브렛 변환 정의 조건에 맞추어 범위를 재조정한 회귀신호이다. 또한, 웨이브렛 역전 달 함수를 정의하여, 궤도틀림을 역 추정하였다. 추정된 궤도틀림과 실제의 궤도틀림의 비교를 위해 상관도와 FRF를 비교 분석하였다. 예측된 값과 기준 값 과의 잔 차의 분산비로 정의되는 틀림지수를 사용하여 궤도틀림의 이상을 분석하였으며, 개발될 알고리즘을 검증하기 위하여 시뮬레이션 연구를 수행하였다.