• 제목, 요약, 키워드: Track irregularity

검색결과 148건 처리시간 0.028초

강화노반재료별 장기 궤도틀림 진행 평가 (Trend of the Long-term track irregularity with Reinforced Railroad Roadbed materials)

  • 최찬용;이지하;박태환
    • 한국철도학회:학술대회논문집
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    • pp.281-285
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    • 2008
  • The railroad roadbed plays an important role in distributing and transferring the train loading to subgrade, preventing subgrade from bearing softened by providing appropriate stiffness for subgrade, and eventually supporting the track structures. Presently, the reinforced roadbed was widely constructed in high speed line and is proceeding a research about economical thickness and methodologies for the design of reinforced roadbed. Field test section is located at Kyungbu line which is from Suwon to Cheonan In this study, field test were measured a track irregularity with several types of reinforced roadbed materials by using Track Master. The field testing were conducted between March, 2006 and April, 2008.

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차량의 동적 특성 분석을 통한 궤도틀림 식별 (An Identification of Track Irregularity by Analyzing Dynamic Characteristics of a Train)

  • 김성용;박은천
    • 한국철도학회:학술대회논문집
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    • pp.2095-2106
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    • 2010
  • In this study, to grasp the stability of train and to identify the track irregularity, the algorithm was proposed. As the track deformation occur due to running train, the dynamic characteristics of train show non-linearity. The representative transfer functions of wheel to car response were calculated from the frequency response functions which were estimated from measured triaxial accelerations. The measured acceleration responses were compared with the estimated responses from filtered acceleration outputs. This result could show the non-linearity of train system at the location of track deformed. The proposed algorithm was verified by matching with the site investigation.

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슬래브궤도의 방진효율성 평가기법 개발 (Development of Evaluation Method of Vibration-Reduction Efficiency in Slab Track)

  • 양신추;강윤석;김만철;이종득
    • 한국철도학회:학술대회논문집
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    • pp.463-470
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    • 1999
  • In this paper, a numerical method for evaluating the efficiency of vibration reduction of substructure under slab track is developed for optimal design of floating slab track. The equation of motion for train and track interaction system is derived by applying compatibility condition at the contact points between wheels and rails. The train is modelled by 3-masses system and the track by continuous support beam system. Numerical analyses are carried out to investigate the effect of train speed, stiffness and damping of slab-pad, and track irregularity upon vibration reduction in substructure under the track.

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준고속 도시철도의 진동분석 및 저감대책 (Vibration Analysis and Mitigable Countermeasures of Semi High-speed Subway Electric Trains)

  • 박기수;최연선
    • 한국소음진동공학회논문집
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    • v.18 no.10
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    • pp.1014-1023
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    • 2008
  • Subway electric trains need to be faster for accommodation of long distance passengers. The faster run of the existing trains results in deterioration of ride quality due to noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed and an ADAMS/Rail model was set up to verify the running test results. The experimental results show that the sources of the cabin noise and vibration basically comes from the irregularity of the railroad track and the deterioration of the connection part between cabin and bogie. Consequently for mitigation of noise and vibration of the electric train, the redesign of the center pivot with softer stiffness and the minimization of rail irregularity are necessary. the frequent maintenance of the train will lead to better comport.

인접굴착공사에 따른 지하철 궤도 변형 해석을 위한 매개변수 연구 (Parameter Study of Track Deformation Analysis by Adjacent Excavation Work on Urban Transit)

  • 최정열;조수일;정지승
    • 문화기술의 융합
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    • v.6 no.4
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    • pp.669-675
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    • 2020
  • 본 연구에서는 인접굴착공사 시 지하철 궤도에 발생되는 변형수준을 평가하는데 있어서 3D 해석 모델로 분석하였으며, 해석의 주요 매개변수로서 터널모델의 경계조건과 지하수위 적용 수준 설정하여 해석을 수행하였다. 3차원 수치해석 모델을 이용한 궤도틀림 영향 검토 결과, 3차원 모델의 시종점부 경계조건의 구속조건을 변경하고, 설계지 하수위가 아닌 현장지하수위를 고려한 해석모델의 경우 보다 합리적인 궤도변형 예측이 가능한 것으로 분석되었다. 또한 해석모델의 경계조건 및 하중조건에 따른 궤도틀림의 영향은 방향틀림, 고저틀림 및 궤간틀림과 같이 레일의 종방향 상대변위 발생에 직접적인 영향을 받는 인자에서 보다 명확한 차이가 발생되었다. 따라서 열차진행방향에 대한 선로의 변형유무를 평가하기 위한 인접굴착공사에 따른 궤도안정성 평가 시에는 레일의 변형수준을 평가할 수 있는 3차원 수치모델을 사용하여 궤도의 변형을 평가하는 것이 적정한 것으로 분석되었다. 또한 수치모델의 시종점부 경계조건 및 하중조건 설정에 주의가 필요한 것으로 분석되었다.

고저틀림에 따른 KTX 주행거동 특성 분석 (Analysis on Safety and Ride Comfort of KTX According to Track Surface)

  • 최일윤;구동회;황석렬;임윤식
    • 한국철도학회논문집
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    • v.13 no.6
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    • pp.583-588
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    • 2010
  • 궤도틀림은 철도차량의 주행거동에 영향을 미치는 중요인자 중 하나이다. 따라서, 적정한 승차감 및 주행안전성 확보를 위해서는 궤도틀림과 차량거동과의 상관관계를 규명하고 적정한 궤도틀림 관리방안을 마련하는 것이 매우 중요하다. 본 논문에서는 궤도틀림 중 경부고속선에서 궤도정정작업 중에서 가장 많은 보수 비중을 차지하고 있는 고저틀림과 KTX 주행거동과의 상관관계를 조사하고자 고저틀림의 파장과 진폭을 매개변수로 차량주행해석을 수행하였다. 탈선계수, 횡압, 대차 횡가속도, 차체 연직 및 횡가속도 등의 KTX 차량거동에 대한 수치해석 결과분석을 통하여 고저틀림의 진폭 및 파장이 KTX 차량의 주행거동에 미치는 영향을 분석하였다.

와전류 제동장치 설계검증을 위한 동역학적 해석 (Dynamic analysis of eddy current brake system for design evaluation)

  • 정경렬;김경택;백진성
    • 한국소음진동공학회:학술대회논문집
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    • pp.110-115
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    • 2002
  • In this paper, the results of an analysis of the dynamic behavior of the eddy current brake(ECB) system are presented. The measured irregularity of the track in Korean high speed line and the track irregularity given by ERRI(high level) were used for simulation. The wheel-rail profile combination were analyzed with different rail gauges. A model of the bogie with an substitute body for the carbody was implemented in the Multi-body-Simulation Program SIMPACK. The ECB frame was modelled both as flexible body and as rigid body. Four different driving conditions were analyzed. In this study dynamic behavior in general were performed to evaluate the design of eddy current brake system and specially the effect of damper was also studied. A comparison of simulations with and without damper shows that the damper have most effect for lower speed. The simulation results will be verified by comparison with measured data from on line test and also used for improving design.

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열차하중에 의한 이층노반구조의 동적 응답특성 (Dynamic Response Characteristics for Two-layered Trackbed Structure by Train Load)

  • 이일화
    • 한국철도학회논문집
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    • v.14 no.2
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    • pp.160-166
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    • 2011
  • 열차하중에 의한 토공노반의 동적응답은 다양한 주변환경에 종속적이기 때문에 정확한 특성을 규명하는 것은 어렵다. 그러나 일부 궤도틀림의 원인이 노반의 불균일한 지지력과 이에 따른 동적 응답의 영향일 것으로 예상되기 때문에 다양한 궤도틀림원인 분석 및 대책에 대한 연구를 위해서는 노반의 동적응답에 대한 연구가 필요하다. 본 논문에서는 노반의 동적응답이 궤도변형에 미치는 영향을 분석하기 위한 기초연구로서 여러가지 영향조건 중 노반의 구조와 재료강성의 변화에 따른 노반의 탁월 주파수와 진동에너지의 크기에 대한 응답을 검토하였다. 검토단면은 탁월대역의 에너지 증폭이 쉬운 이 층노반구조로서 노반과 연암으로 구성하였다. 검토내용은 각 조건별 파의 전파특성을 규명하고 노반의 동적응답을 이론적, 해석적, 경험적 방법으로 비교 검토하여 궤도틀림에 미치는 영향을 평가하였다.

궤도품질평가를 위한 궤도틀림 지표에 대한 연구 (A Study on the Track Irregularity Index for the Estimation of Track Quality)

  • 오지택;한승용
    • 한국철도학회:학술대회논문집
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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.

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궤도 설계 동하중 산정을 위한 차량/궤도 상호작용 해석기법 개발 (Development of a Numerical Analysis Method of Train/Track Interaction for Evaluation of Dynamic Track Design Load)

  • 양신추
    • 한국철도학회:학술대회논문집
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    • pp.1094-1099
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    • 2002
  • In this paper, a numerical method for vehicle-track interaction analysis is developed to evaluate vertical dynamic force subjected to rail surface. A vehicle is modelled by lumped masses system and track by multi layered continuous beam system. The equation of motion of vehicle and track interaction system is derived by considering compatibility condition at the contact points between wheel and rail. The input vibration source is given by the empirical formula of power spectral density of track irregularity, which is suggested by FRA. Using this method, dynamic impact factors with the train speed are evaluated.

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