• Title/Summary/Keyword: Shunting

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Strategies for the Automatic Decision of Railway Shunting Routes Based on the Heuristic Search Method (휴리스틱 탐색기법에 근거한 철도입환진로의 자동결정전략 설계)

  • Ko Yun-Seok
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.5
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    • pp.283-289
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    • 2003
  • This paper proposes an expert system which can determine automatically the shunting routes corresponding to the given shunting works by considering totally the train operating environments in the station. The expert system proposes the multiple shunting routes with priority of selection based on heuristic search strategy. Accordingly, system operator can select a shunting route with the safety and efficiency among the those shunting routes. The expert system consists of a main inference engine and a sub inference engine. The main inference engine determines the shunting routes with selection priority using the segment routes obtained from the sub inference engine. The heuristic rules are extracted from operating knowledges of the veteran route operator and station topology. It is implemented in C computer language for the purpose of the implementation of the inference engine using the dynamic memory allocation technique. And, the validity of the builted expert system is proved by a test case for the model station.

A Study on The Shunting Rates Evaluation of GIS type Grounding Systems (GIS형 접지계의 분류율 산정에 관한 연구)

  • Jung Gil-Jo;Kim Jae-Yee
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.4
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    • pp.172-177
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    • 2005
  • The testing and evaluating shunting rates of operating substations have become difficult recently due to various factors including increased fault current, limited area of urban substations and construction of substations in mountain location. In this paper, we have analysed the computation and measurement method of shunting currents that be applied grounding system maintenance of power substations. Also, simple and detailed test methods using 70Hz current injection are explained. A computer program is developed for a study on the shunting properties such as grounding impedance and shunting rates of grounding current, and the simulation results are compared with the measurement data to prove validity and effectiveness of the program and measurement method under commercial operation of a GIS type model substation respectively.

Passive Damping Enhancement of Composite Beam Using Piezo Ceramic Connected to External Electrical Networks (외부 회로가 연결된 압전 세라믹을 이용한 복합재 보의 수동 감쇠 개선)

  • Yang, Seung-Man;Kim, Do-Hyung;Han, Jae-Hung;Lee, In
    • Composites Research
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    • v.12 no.2
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    • pp.1-9
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    • 1999
  • The piezoelectric material connected to external electric networks possesses frequency dependent stiffness and loss factor which are also affected by the shunting circuit. The external electric networks are generally specialized for two shunting circuits: one is the case of a resistor alone and the other is the combination of a resistor and an inductor. For resistive shunting, the material properties exhibit frequency dependency similar to viscoelastic materials, but are much stiffer and more independent of temperature. Shunting with a resistor and inductor introduces an electrical resonance, which can change the characteristics of structural resonance optimally in a manner analogous to a PMD (proof mass damper). Passive damping enhancement of composite beam using piezoelectric material connected to external electrical networks is achieved and presented in this paper.

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A Study on Improved Safety and Efficiency of Shunting In View of Principles of Train Operation Safety (안전 및 효율성 제고를 위한 입환방식에 열차운전원칙 적용에 관한 연구)

  • Jeon, Young Seok
    • Journal of the Korean Society for Railway
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    • v.16 no.2
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    • pp.79-84
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    • 2013
  • The definition and classification of shunting, which involves the process of sorting rolling stock into complete train sets inside station yard, are not clearly specified in Korean domestic safety regulations for railway operations. As a result, collisions during shunting occur rather frequently compared with other types of accidents in railway operations. Therefore, new systematic safety principles are proposed in this paper to improve operation safety during shunting. The improvements in safety and efficiency derived from the newly proposed approach are analyzed and verified in field application.

Cerebral Venous Thrombosis Complicated by Hemorrhagic Infarction Secondary to Ventriculoperitoneal Shunting

  • Son, Won-Soo;Park, Jae-chan
    • Journal of Korean Neurosurgical Society
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    • v.48 no.4
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    • pp.357-359
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    • 2010
  • While a delayed intracerebral hemorrhage at the site of a ventricular catheter has occasionally been reported in literature, a delayed hemorrhage caused by venous infarction secondary to ventriculoperitoneal shunting has not been previously reported. In the present case, a 68-year-old woman underwent ventriculoperitoneal shunting through a frontal burr hole, and developed a hemorrhagic transformation of venous infarction on the second postoperative day. This massive venous infarction was caused by bipolar coagulation and occlusion of a large paramedian cortical vein in association with atresia of the rostral superior sagittal sinus. Thus, to eliminate the risk of postoperative venous infarction, technical precautions to avoid damaging surface vessels in a burr hole are required under loupe magnification in ventriculoperitoneal shunting.

Life-Cost-Cycle Evaluation Analysis of the Shunting Locomotive (입환기관차의 LCC 평가분석)

  • Bae Dae-Sung;Chung Jong-Duk
    • Journal of the Korean Society for Railway
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    • v.8 no.3
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    • pp.260-266
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    • 2005
  • The deterioration of a shunting locomotive was characterized for the lifetime assessment. The locomotive has been used for shunting works in steel making processes, and in this investigation, various types of technical evaluation methods for the locomotive parts were employed to assess the current deterioration status and to provide important clue for lifetime prediction. Unlike other rolling stocks in railway applications, the diesel shunting locomotive is composed of major components such as diesel engine, transmission, gear box, brake system, electronic devices, etc., which cover more than 70 percent of the total price of the locomotive. Therefore, in this paper, each part of major components in the diesel locomotive was analyzed in terms of the degree of deterioration. The lift-cycle-cost (LCC) analysis was performed based on the maintenance and repair history as compared with economical cost to provide the cost-effective prediction, i.e., to assess either repair for reuse or putting the locomotive out of service based on cost-effective calculation.

Deterioration Analysis of the Shunting Locomotive Through Precision Diagnosis Assessment : Diesel Engine & Power Transmission Parts (입환기관차의 노후도 정밀진단 : 엔진 및 동력전달장치)

  • Chung Jong-Duk;Kim Jeong-Guk;Hong Yong-Ki;Lee Dong-Hyung;Pyun Jang-Sik
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.545-550
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    • 2004
  • The deterioration of a shunting locomotive was characterized for the lifetime assessment. The locomotive has been used for shunting works in steel making processes, and in this investigation, various types of technical evaluation methods for the locomotive parts were employed to assess the current deterioration status and to provide important clue for lifetime prediction. Unlike other rolling stocks in railway applications, the diesel shunting locomotive is composed of major components such as diesel engine, transmission, gear box, brake system, electronic devices, etc. In this paper, the degree of deterioration in a diesel engine and power transmission parts has been presented based on the analysis results.

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Life-Cost-Cycle Evaluation Analysis of the Shunting Locomotive (입환기관차의 LCC 평가분석)

  • Chung Jong-Duk;Kim Jeong-Guk;Pyun Jang-Sik;Kim Pil-Hwan
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.551-556
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    • 2004
  • The deterioration of a shunting locomotive was characterized for the lifetime assessment. The locomotive has been used for shunting works in steel making processes, and in this investigation, various types of technical evaluation methods for the locomotive parts were employed to assess the current deterioration status and to provide important clue for lifetime prediction. Unlike other rolling stocks in railway applications, the diesel shunting locomotive is composed of major components such as diesel engine, transmission, gear box, brake system, electronic devices, etc., which cover more than 70 percent of the total price of the locomotive. Therefore, in this paper, each part of major components in the diesel locomotive was analyzed in terms of the degree of deterioration. The life-cycle-cost (LCC) analysis was performed based on the maintenance and repair history as compared with economical cost to provide the cost-effective prediction, i.e., to assess either repair for reuse or putting the locomotive out of service based on cost-effective calculation.

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Deterioration Analysis of the Shunting Locomotive Through Precision Diagnosis Assessment : Running Performance Assessment (입환기관차의 노후도 정밀진단 : 주행성능평가)

  • Pyun Jang-Sik;Chung Jong-Duk;Kim Jeong-Guk;Choi Kyung-Jin;Kim Won-Kyung
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.557-562
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    • 2004
  • The deterioration of a shunting locomotive was characterized for the lifetime assessment. The locomotive has been used for shunting works in steel making processes, and in this investigation, various types of technical evaluation methods for the locomotive parts were employed to assess the current deterioration status and to provide important clue for lifetime prediction. Unlike other rolling stocks in railway applications, the diesel shunting locomotive is composed of major components such as diesel engine, transmission, gear box, brake system, electronic devices, etc. In this paper, the analysis results of running performance assessment have been used to provide the critical information for the criteria of precision diagnosis assessment.

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Deterioration Analysis of a Shunting Locomotive: Carbody and Bogies (입환기관차의 노후도 평가 : 차체 및 대차)

  • Kim Jeongguk;Jong Jong-Duk;Pyun Jang-Sik;Chang Se-Ky;Hong Yong-Ki;Kim Weon-Kyung
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.269-276
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    • 2004
  • Deterioration analysis was performed on carbody and bogies of a shunting locomotive, which has been used for shunting works in steel making processes. In this investigation, various types of technical evaluation methods for the locomotive were employed to assess the current deterioration status. Corrosion test and nondestructive evaluation (NDE) techniques were employed to demonstrate the wear status of the carbody and bogie parts in the locomotive. Since the locomotive has been working under corrosive environment, the corrosion tests with x-ray analysis for exterior part of the locomotive were conducted to examine the evolution of corrosion reaction, and NDE techniques such as ultrasonic testing, magnetic particle testing, and x-ray radiography, were conducted on the carbody and bogies to inspect any possible inherent and/or in-service flaws. In this paper, the degree of deterioration in a shunting locomotive has been presented based on the analysis results.

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