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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Railway
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Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
A Study on the Revitalization of Railway Station Water Tower
Lee, Hyun-Jeong ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 357~362
The railroad that represents modern industry began appearing in 1899. However, after the steam locomotive that provided water stopped the service, the water towers within the railroad station were useless. Suggestions presented in this study for activating the environment around the water towers that are designated as the cultural properties results are as followed: 1) The place where people can experience the vestiges of Korean War and the region that different novels accommodated. 2) A plaza 3) A facility for exhibition of industry inheritance and local products 4) A local landmark 5) Reproduction of the historical steam locomotive and water tower Local residents should participate in the activation process. And the designer should consider the environmental context. In addition, the activation of water towers should be designed under an urban plan.
A Study on Structural Integrity and Dynamic Characteristic of Inertial Load Test Equipment for Performance Test of Railway Vehicle Propulsion Control System
Jang, Hyung-Jin ; Shin, Kwang-Bok ; Lee, Sang-Hoon ; Lee, Dae-Bong ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 363~370
This paper describes the evaluation of structural integrity and dynamic characteristic of inertial load test equipments for performance test of railway vehicle propulsion control system. The propulsion control system of railway vehicle has to be confirmed of safety and reliability prior to its application. Therefore, inertial load test equipments were designed through theoretical equation for performance test of propulsion control system. The structural analysis of inertial load test equipments was conducted using Ansys v11.0 and the dynamic characteristic was evaluated using Adams. The results showed that the structural integrity of inertial load test equipment was satisfied with a safety factor of 10.2 on the bearing part under combined load. Also, the structural stability of flywheel according to dynamic simulation was secured by the maximum oscillation displacement within 0.83mm.
A Study on the Window Glass Pressure for High-speed Train
Kwon, Hyeok-Bin ; Chang, Dae-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 371~375
In order to decide the strength requirement of the window glass for the high-speed train, the pressure change during the passage of the EMU type high-speed train has been numerically simulated. Based on the calculation results, the pressure difference between the inner and outer pressure of the cabin has been calculated to yield the amount of load acting on the window glass of the cabin. To simulate the pressure field generated by the high-speed train passing through the tunnel, computational fluid dynamics based on the axi-symmetric Navier-Stokes equation has been employed. The pressure change inside a train has been calculated using first order difference approximation based on a linear equation between the pressure change ratio inside a train and the pressure difference of inside and outside of the train.
Field Measurements to Predict the Wind Gust under Train at the Speed-up of Conventional Railway Lines
Kwon, Hyeok-Bin ; Nam, Seong-Won ; Ko, Tae-Hwan ; Jeon, Byung-Kill ; Kim, Man-Cheol ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 376~381
In this study, field measurements on KTX, Nuriro and TTX train have been conducted at Kyeongbu and Honam line to predict the wind gust under train at the speed-up of major conventional railway lines using Kiel-probe array and multi-channel pressure scanning system. The results show that the average wind velocity during train passage normalized by train speed is independent to train speed, thus the wind gust for a given train type at the speed-up condition could be predicted. The relationship between the shape of underbody and the characteristics of the underbody wind gust has been discussed.
A Study on the Standardized Finite Element Models for Carbody Structures of Railway Vehicle Made of Sandwich Composites
Jang, Hyung-Jin ; Shin, Kwang-Bok ; Ko, Hee-Young ; Ko, Tae-Hwan ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 382~388
This paper describes the standardized finite element model for carbody structures of railway vehicle made of sandwich composites. Recently, sandwich composites were widely used to railway vehicle due to the improvement of energy efficiency, high specific stiffness and strength, weight reduction and space saving in korea. Therefore, structural integrity should be verified using finite element analysis prior to the manufacture of composite railway vehicle. The standardized finite element model for composite carbody structures was introduced through comparing the results of real structural test under vertical, compressive, twisting load and natural frequency test of various railway vehicles in this study. The results show that the quadratic shell element is suitable to model the reinforced metal frame used to improve the flexural stiffness of sandwich panel compared to beam element, and layered shell and solid element are recommended to model the skin and honeycomb core of sandwich panel compared to sandwich shell element. Also, the proposed standard finite element model has the merit of being applied to crashworthiness problem without modifications of finite element model.
A Study on the Wearing Phenomenon Analysis of Pantograph Slider for the Subway Cars
Kim, Young-Gyu ; Kwon, Seok-Jin ; Won, Si-Tae ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 389~395
This paper is about the copper slider with high electric conductivity and resistance arc. A new copper slider which has enhanced resistance against frictional wear was developed. By alteration of its material components and manufacturing process, its material property has been enhanced. To verify its enhanced wear-resisting capacity, a laboratory test and a field test were carried out. As the laboratory test, a dynamo test was performed and its test result showed that the developed new copper slider had superior wear-resisting capacity to the currently used copper slider. The new one showed double durability of the current one and normal wearing characteristics. A filed test was performed on the Metro subway lines at service by Seoul Metro. The field test showed similar results to those from the laboratory test, which the d eveloped new copper slider has double superior durability and sound wearing patterns. Authors strongly believe that the replacement of the copper slider currently in use by the developed new one will contribute to the economic and efficient operation of the subway line system
A Study on the HAZOP-KR for Hazard Analysis of Train Control Systems
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ; Han, Chan-Hee ; Cho, Woo-Sik ; Ahn, Jin ; Ha, Dong-Myeong ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 396~403
Train control system require high level of safety since these are vital control system to ensure safe operation of the train. According to these reason, safety-related regulations for railway signaling systems are standardized in IEC. In Korea, many attempts are tried to procure the level to meet the international standards, but thats's efforts are beginning steps. HAZOP study is recommended for hazard analysis at IEC standards, but this method has several unsuitable problems because this method is developed in chemical plant domain. In this paper we recommend new method of HAZOP, named HAZOP-KR, which would be suitable for analyzing safety of the train control systems. An example of this method applied to real system is also included.
A Study on Deduction and Characteristic Analysis of Magnetic Equivalent Circuit Parameters of a Rotary-typed Small-scaled LIM for a Railway Transit
Park, Chan-Bae ; Lee, Hyung-Woo ; Lee, Byung-Song ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 404~411
Authors conducted a deduction and characteristic calculation of the some parameters using a magnetic equivalent circuit method to verify a basic design result of a rotary-typed small-scaled linear induction motor for a railway transit. In a LIM, it is possible to express the parameters of the magnetic equivalent circuit into a function of the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. It means that the LIM properties can be changed considerably by the shape of the secondary aluminium plate and the airgap between the LIM primary core and the secondary aluminium plate. So, authors analyzed a tendency of changes of the magnetic equivalent circuit parameters and the LIM characteristics by changing of the airgap, the thickness of the secondary aluminium plate and the overhang length and shape of a rotary-typed small-scaled LIM, and accomplished a basic research to develop a real-scaled LIM for a railway transit.
Software Quality Assurance Activities of Automatic Train Control System to meet Requirements of the IEC 62279 Standard
Shim, Kyu-Don ; Lee, Jong-Woo ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 412~418
This paper presents the methods to acquire the Safety Certificate from Independent Safety Assessment based on the IEC standard62279 which is commonly applied to railway system for Automatic Train Control(ATC) system in accordance with Urban Maglev project. This also shows approach methods and relative activities for project life- cycle to accomplish and ensure the system requirements of ATC system, RAMS and S/W quality activities. Furthermore, the key tasks conducted with ISA are noted in detail. These kind of activities for software quality of ATC system to obtain S afety Certificate could be a CASE model to improve the quality of domestic railway system and products, and also contribute to the growth of railway business and toward the achievement of overseas' railway signaling markets.
State Estimation of Electric Railway Substation using Equality Constraints
Kim, Baik ; Hong, Hyo-Sik ; Yoo, Kwang-Kiun ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 419~424
Through the process of state estimation in the electric railway substation, this paper presents a new method for improving the reliability of the measurements corrupted by gauge error. Unlike the case of commercial power systems, it has been difficult to perform the state estimation by using the usual methods in the electric railway substation. At some of the monitoring points in the substation, most often, it is hard to define the measurement functions by use of the states or as we set up a new states set with the change of system topology, some of the measurement functions become part of the states themselves, which leads to poor results. To resolve the problems in the existing method caused by the relations between the states and the measurement functions at the monitoring points, the proposed method in this paper exploits the equality constraints. They can be derived numerously and concisely from the current and the voltage attributes of the Scott transformer and the buses connecting conditions, etc. We have proofed the effectiveness of the proposed method by the test on a standard sample substation.
Seismic Performance of Prefabricated Composite Column for Accelerated Bridge Construction
Lee, Jung-Woo ; Chin, Won-Jong ; Joh, Chang-Bin ; Kwark, Jong-Won ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 425~430
This paper investigates the seismic behavior of a prefabricated composite column which is made by onsite connection of precast composite column segments to accelerate bridge construction. Quasi-static cyclic loading tests were performed on three prefabricated composite columns with different connection details to find their seismic capacity. Test results show that the onsite connections remains in elastic range and no slip is observed as designed in spite of plastic hinge formation at the column. The test results also indicate that the prefabricated composite column has better overall seismic capacity compared to a conventional reinforced concrete column with seismic details.
Experimental Investigation on Dynamic Behavior of Steel Fiber Reinforced Concrete Structures
Kang, Bo-Soon ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 431~439
In this paper, dynamic behavior of steel fiber reinforced concrete(SFRC) by experimental method is discussed. Because of its improved ability to dissipate energy, impact resistance and fatigue behavior, SFRC has a better dynamic behavior than that of plain concrete. Dynamic behavior is influenced by longitudinal reinforcement ratio, volume and type of steel fiber, strength of concrete and the stress level. Impact resistance and fatigue behavior in the SFRC has been evaluated from dynamic experimental test data at various levels of cracked states in the elements.
Estimation of Aseismatic Performance of Laminated Rubber Bearing Through Shaking Table Tests
Park, Seong-Kyu ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 440~446
This paper was investigated on the laminated rubber bearing, which mitigates damages of bridges from threat of earthquakes. Laminated rubber bearing can bear large loads for long periods of time and be capable of large deformations during an earthquake. To evaluate seismic isolation with laminated rubber bearing on several earthquake waves, we performed a shaking table test. In this test, deck acceleration was measured by accelerometers and shear force on piers was surveyed by load cells. Furthermore, seismic capacity of isolated systems with laminated rubber bearing was compared with non-isolated systems through shaking table test. The results show that deck acceleration and shear force were relatively reduced by laminated rubber bearing.
Experimental Study for Establishing Rail Grinding Period in the Urban Railway
Sung, Deok-Yong ; Go, Dong-Chun ; Park, Yong-Gul ; Kong, Sun-Yong ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 447~454
The defects of rail head induced by fatigue and deterioration are mainly classified by two types ; one occurred on the surface of rail head the another occurred on the inner rail head. This study performed the surface irregularity measurement of rail head according to the passing tonnage in the urban railway. Also, we carried out microscopic structure test, chemical component test and micro-hardness test for the specimen which is the used rail on metro line by accumulated passing tonnage. As a result of this study, for new rail, it should be performed initial grinding in order to remove 0.3mm of de-carbonized layer. The preventive-cyclic grinding for preventing RCF defects is proposed two options : grinding by the whole line and grinding by specified sections.
Development of Railway Accidents Causal Analysis System
Song, Bo-Young ; Kim, Mhan-Woong ; Moon, Dae-Seop ; Lee, Dong-Hoon ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 455~461
We have identified which causes have influenced to accidents, case by case through a relational analysis on data of accidental case, root case, accident cause and hazard. The data on the accident of railway operation and system have been analyzed and the root cause, accident cause and hazard have been classified. This research has developed accident cause analysis system to build efficient railway safety policy which will be used to prevent railway accidents by government and railway operator.
Productivity Changes in Korea Railway Lines Using MPI
Kim, Hyun-Woong ; Lee, Jin-Sun ;
Journal of the Korean Society for Railway, volume 13, issue 4, 2010, Pages 462~467
This paper uses MPI (Malmquist Production Index) method to provide basic information and policy direction derived to improve the productivity. This can identify whether or not the railroad service have excellent services, if there are structural problem, in which sector is experiencing a degree of productivity, in which sector should be set targets to some degree. According to the result, the productivity of Korea railway lines is measured 1.1 both publicity and profitability aspects. Changes in production technology were the most important causes. Strategic planning should consider to increase the productivity such as modernization of facilities and equipment, cost savings, and increase in productivity of employee and rail cars.