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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 9, Issue 6 - Dec 2006
Volume 9, Issue 5 - Oct 2006
Volume 9, Issue 4 - Aug 2006
Volume 9, Issue 3 - Jun 2006
Volume 9, Issue 2 - Apr 2006
Volume 9, Issue 1 - Feb 2006
Selecting the target year
Transmission Loss Prediction of the High Speed Railway's Wall Section
Kim, Kwan-Ju ; Park, Jin-Kyu ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 1~6
The purpose of this study is to calculate transmission loss of the high speed railway's wall section accurately. Transmission loss measurement of ideal case i.e. the wall in the laboratory condition was carried out in first, which results were compared with those by statistical energy method. Transmission loss values of high speed railway calculated out by experimental method are compared with those from closed form solution. Commercial statistical energy analysis was also used to predict the outside pressure level using those measured transmission loss values. Simple SEA model could estimate reasonable exterior sound pressure level.
Stress transfer mechanism of ballast bed using DEM (Discrete Element Method)
Kim Dae-Sang ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 7~11
Ballast is an important component of railway track structures. The granular ballast can be modelled using [mite or discrete element methods. The DE method has advantages to enable us to analyze the microstructure of granular materials and to exhibit information which cannot be assessed using FE methods. In this paper, sleeper, the ballast, and ballast mat in the high-speed railroad line are modelled using two-dimensional discrete circle and line elements. The stress transferred from the sleeper via the ballast to the subgrade is analyzed. In addition, the shape and angle of stress distribution of ballast bed is evaluated with different boundary conditions for the high-speed railroad line.
Vibrational Characteristics of Suspension Bridge by Full-Scale Test
Chog Sun-Kyu ; Kim Sun-Kon ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 12~17
The bridge to be analyzed is a self-anchored suspension bridge which is constructed within the country. Forced vibration test was performed with oscillator for verification of safety, maintenance and management. In this study, the feasibility of deduction was verified with the modified analysis model by comparing natural frequency, natural mode and damping ratio of the real bridge, which are obtained from the vibration test of the whole bridge after construction of 3-dimensional self-anchored cable suspension bridge, with the eigenvalue of analytic computation model and evaluating them. As a result of study, the friction of bridge bearing must be considered to get the natural frequencies of flexural vibration, and evaluating the polar moment of inertia is critical factor in analysis modeling in case of torsional vibration. The logarithmic damping ratio of the test appeared to exceed the ordinary one assumed at the design phase.
The Effect of Train Motion on Dynamic Characteristics of Current Collection System
Kim Jung-Soo ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 18~22
The dynamic characteristics of the current collection system are investigated by conducting a test run in which signals from accelerometers and load cells attached to the various parts of the pantograph are analyzed in both the time and frequency domains. The dynamic characteristics of the current collection system are found to be strongly influenced by the train speed; the fluctuation in the pantograph motion increases in direct proportion to the train speed. There exist two major fequency components in the pantograph motion related to the current collection, a speed-dependent component arising from the train traversing a span of the catenary, and a speed-independent component related to the pantograph resonant frequency. The train acceleration is also found to exert strong influence on the current collection system characteristics. The effect of the train motion is found to be stronger on the speed-dependent frequency component than on the speed-independent one.
A study on the economical feasibility analysis method for introducing the urban transit system
Park Jung-Hwa ; Lee Ho-Yong ; Hong Soon-Heun ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 23~28
Many services have been served by the exiting subway systems since they have opened in 1975. But its efficiency and competition were going down because of the high construction cost and difficult connection with other transportations, etc. Otherwise, the light rail transit system is much lower construction cost than the subway and the high way building. Also those systems are good at the inexpensive operation cost, the fixed time and safety, the easy access. Recently, the several provinces are planning or advancing the light rail transit system because of these many benefits. Consequently, those system's economical feasibility analysis is required rapidly to show the resonable construction's cause and to get the private investment. This paper offers the system's economical feasibility through the several benefit analysis after the light rail transit system's construction.
Safety Evaluation of Elevated Guideway during Abnormal Operation on LRT of Driverless Automatic Driving System
Son Eun-Jin ; Kim Min-Soo ; Lim Young-Su ; Lim Jong-Pil ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 29~35
Trains in LRT(Light Railway Transit) system usually have shorter car length than metro's because of their smaller passensers demand. Therefore it is very likely that the load condition of LRT system in abnormal operation, in case of which trains are in close proximity by system broke or train rescue works, could be worse rather than in normal operation, in spite of rare probability of abnormal operation. In this study, the target reliability indexes of several abnormal operations are estimated in accordance with the occurrence probabilities of each abnormal operation case and the reliability index of normal operation presented by the specification. From the indexes, load factors for the abnormal operation cases are estimated and the safety evaluation is performed for Yong-in LRT project.
A Study on Strategical Penetration of the Korean High-Speed Train System into Chinese Market through the Technology Transfer
Song Dahl-Ho ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 36~42
Studied was a strategic plan for the Korean High-Speed Train system to penetrate the Chinese railway market in exchange of the technology of KHST. Firstly, taken was a glance at Chinese Government plans to extend total length of his railway lines and to construct the Beijing~Shanghai high-speed railway line. Then, disparity of railway technology in Korea and China was reviewed. From the review, SWOT Analysis were carried out to penetrate the foreign markets. Countermeasures to cope with SWOT were also considered. Strategical governmental supports and the establishment of the special organization to be in charge of penetration of KHST into foreign markets were proposed. Finally, also proposed was the transfer of KHST technology to Chinese counterparts in exchange of tangible benefits for Korean side. The benefits may include (1) adoption of KHST as the type of rolling stock for the Beijing~Shanghai line, (2) guarantee of participation in the project and royalty for the KHST technology used for the future high-speed railway line construction, (3) prior written approval and partnership when making its way to third country, and (4) participation of Korean construction companies in Chinese railway construction project, etc. Adoption of KHST in China indeed gives chance to integrate the high-speed railway network after reunification of Korean peninsular, and enhance the economic ties between two countries.
A Study on Manufacturing Technology and Evaluation of the Structural Integrity of a Sandwich Composite Train Roof Structure
Shin Kwang-Bok ; ; ; Lee Sang-Jin ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 43~49
We have evaluated the structural integrity of a sandwich composite train roof structure that can be a lightweight, cost saving solution to large structural components for rail vehicles in design stages. The sandwich composite train roof structure was 11.45 meters long and 1.76 meters wide. The finite element analysis was used to calculate the stresses, deflections and natural frequencies of the sandwich composite train roof against the weight of air-conditioned system. The 3D sandwich finite element model was introduced to examine the structural behavior of the hollow aluminum extrusion frames joined to both sides of the sandwich composite train roof. The results shown that the structural performance of the sandwich composite train roof under loading conditions specified is satisfaction and the use of aluminum reinforced frame and aluminum honeycomb core is beneficial with regard to weight saving and structural performance in comparison with steel reinforced frame and polyurethane foam core. Also, we have manufactured prototype of sandwich composite train roof structure on the basis of analysis results.
A Study on a Mathematical Model of the Long-term Track Tamping Scheduling Problem
Oh Seog-Moon ; Lee Jeeha ; Lee Hee-Up ; Park Bum Hwan ; Hong Soon-Heum ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 50~56
This paper presents a mathematical model of the long-term track tamping scheduling problem in the Korean highspeed railway system. The presented model encompasses various operational field constraints, moreover improves a state-of-the-art model in extending the feasible space. We show the model is sized up to intractable scale, then propose another approximation model that is possible to handle with the present computer system and commercial optimization package, directly. The aggregated index, lot, is selected, considering the resolution of the planning horizon as well as scheduling purpose. Lastly, this paper presents two test results for the approximation model. The results expose the approximation model to quite promising in deploying it into an operational software program for the long-term track tamping scheduling problem.
Buckling of T-Shaped Composite Columns
Lee Seungsik ; Back Sung-Yong ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 57~62
Composite thin-walled members for civil engineering application are mainly produced by pultrusion technique, and they are generally made of a polymeric resin system reinforced by E-glass fibers due to economical reason. This material combination results in low elastic moduli of the composite materials and makes the design of composite members to be governed by stability limit state. Therefore the buckling behavior of composite thin-walled members was experimentally investigated in the present study. Axial compression was applied on each specimens by a hydraulic ram and knife edge fixtures were placed at both ends to simulate simple boundary condition. Axial compression, lateral displacements and twisting at the mid-height of each specimen were measured by a set of transducers during buckling test. The experimental buckling loads were compared with analytical results obtained through isotropic formulas. In the calculation of analytical results, elastic properties such as Young's modulus(E) and shear modulus(G) were replaced with EL and GLT obtained from coupon tests, respectively.
FFT-based Spectral Analysis Method for Linear Discrete Structural Dynamics Models with Non-Proportional Damping
Lee U-sik ; Cho Joo-yong ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 63~68
This paper proposes a fast Fourier transform(FFT)-based spectral analysis method(SAM) for the dynamic responses of the linear discrete dynamic models with non-proportional damping. The SAM was developed by using discrete Fourier transform(DFT)-theory. To verify the proposed SAM, a three-DOF system with non-proportional viscous damping is considered as an illustrative example. The present SAM is evaluated by comparing the dynamic responses obtained by SAM with those obtained by Runge-Kutta method.
Analysis of Reinforcement Effect with Geotextile types on Soft Ground
Lee Jin-Wook ; Choi Chan-Yong ; Lee Seong-Hyeok ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 69~75
In this study, Several types of geotextile was used on the selected track-bed. The use of geotextile prove a economical and efficientmean to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Chungbuk lines in Korea were selected to investigate in current condition the of track and roadbed. This testing site was divided into 5 sections. In the four sections, different types of geotextiles were installed. In order to estimate for performance of the reinforced section with geotextiles on the soft ground, four different geotextiles were installed and compared with no reinforced section. Also, after the installation, mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, and earth pressures were investigated. The following is the summaries from the field tests. As a conclusion, According to naked eyes investigation, mud pumping didn't happen at reinforced sections, but no reinforced section was happen to a top of track for 6 months. And Elastic displacements at the reinforced and no reinforced section were about
respectively. Also, It was found that plastic displacement in reinforced section was retrained about
more than that in no reinforced section.
Development of Economical Run Model for Electric Railway Vehicle
Lee Tae-Hyung ; Hang Hee-Soo ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 76~80
The Optimization has been performed to search an economical running pattern in the view point of trip time and energy consumption. Fuzzy control model have been applied to build the meta-model. To identify the structure and its parameters of a fuzzy model, fuzzy c-means clustering method and differential evolutionary scheme are utilized, respectively. As a result, two meta-models for trip time and energy consumption were constructed. The optimization to search an economical running pattern was achieved by differential evolutionary scheme. The result shows that the proposed methodology is very efficient and conveniently applicable to the operation of railway system.
A Study on the Service Quality of Korea Train Express
Lee Hyung-seok ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 81~88
The purpose of this study is to verify the dimensions of service quality of Korea Train Express(KTX) and to compare the service quality of KTX with that of general train. The researcher consisted of initial 32 items representing eight-dimension and analyzed the final quality dimensions of KTX. The collected data of passenger of 226 was analyzed by statistical procedures such as the iterative sequence of computing Cronbach's a, corrected item-to total correlations, and factor analyses. Through the repeated statistical process to puritY the items, a final set of 26 items representing six district dimensions; tangibles, timely responsiveness, empathy, comfort, information access and safety. The Results of independent samples t-test showed that the mean scores of all the service quality dimensions of KTX except for comfort were higher than those of general train. This finding will provide the more appropriate instrument to measure the KTX service quality as well as to improve the passengers' perception of the service quality.
A Study on the Problem and Improvement Plan of Rock Bolt Pull Test for Railroad Tunnel Construction
Jang Seog-Jae ; Gwak Su-Jeong ; Kim Doo-Jun ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 89~94
We, presently, don't have clear diagram methods and analysis criteria in rock bolt pull test usable for tunnel reinforcement. So this paper has suggested that; first, 'scheme of apposite diagram method at hard rock and the different application method of rock bolt pull test at weathered and hard rock', and second, 'the pullout capacity specification criteria for design and construction of rock bolt', based on foreign criteria and field test.
A Study on the Development Strategies for the Light Rail Transit Industry
Chung Kyung-Ryul ; Yoon Se-Kyun ; Choi Yong-Hoon ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 95~101
Light rail transit system has many characteristics of better accessibility, frequency service, low construction cost, reduced air pollution and medium-capacity public transport etc. Light rail transit system as a urban transportation system has been growing worldwide since the late 20th century. More than 300 cities around the world have light railway systems. Many medium-size cities in domestic site is planning the construction of light railway. This paper describes the development strategies for the light rail transit industry.
Optimum Design of Prestressed Concrete Girder Railway Bridge II : Optimum Section with 30m Span Length Accounting for Dynamic Stability
Lee Jong-Min ; Kim Su-Hyun ; Jung Jae-Dong ; Lee Jong-Sun ; Cho Sun-Kyu ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 102~109
The PSC girders which currently used at highway bridge have the standard cross sections about 25m, 30m and 35m span. Thus, in case of highway bridge design, the bridge designer can choose the adequate standard cross section according to constructional condition. However, in railway bridge design, there are limitations on reasonable bridge design considering circumstances of a construction site and conditions of location etc, because the PSC girders used at railway bridge have the cross section about only 25m span length. In this study, the optimum design for the PSC girder railway bridge with 30m span length has been performed. Also, in order to investigate the dynamic stability of railway bridge using the optimum section of PSC girder, dynamic analysis has been carried out. From the results of analysis, it is suggested to denote the optimum section which satisfied the structural safety, dynamic stability and economical efficiency all together.
Boulder Detection Methods and its Compensation for Obstruction in sonft Ground Tunnels by Shielded TBM
Jee Warren-Wangryul ; Ha Sang-Gui ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 110~117
Boulder detection methods and its compensation is discussed with consideration of boulder conditions in soft ground tunneling by shielded TBM. For analysis of proper compensation methods for boulder obstruction, its removal costs and cases on eight projects are presented. Compensation for boulder obstruction removal by volume or weight is not practical for most tunneling situation, but compensation by crew time is probably the most equitable method. If boulders are anticipated on project, boulder removal plan must be considered with proper equipment selection.
Field Test on the Rigidities of Substructures of High Speed Railway Bridges
Chin Won-Jong ; Choi Eun-Suk ; Kwark Jong-Won ; Kang Jae-Yoon ; Cho Jeong-Rae ; Kim Byung-Suk ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 118~124
SThe rigidities of bridge substructures are the important data in the rail-bridge interaction analysis in Korean High -Speed Railway. This experimental study is being performed because of followings. 1) More correct longitudinal stiffness of the structure including substructure should be considered in the calculation of stresses in rails. 2) There are many uncertainties in the design and construction of the piers and foundations. 3) Actual guideline for the rigidities of piers and foundations in the design is necessary. 4) Measurement on the rigidity of pier according to the types of piers, foundations and soil-conditions is needed. Curve for estimating the total rigidity of substructure will be obtained through this and further experimental studies. It may be used in the analysis of Korean High-Speed Railway bridge and then, longitudinal stresses in the rails can be estimated more accurately. One pair of piers, which consist of pot-bearing for fixed support and pad-bearing for movable support, are loaded by steel frame devices with steel wire ropes and hydraulic jack. The responses which are measured at each loading stages in those field tests are displacements and tilted angles on the top and bottom of piers. This study is being performed testing and analysis about several piers in the construction field.
Diminution of birdge vibration for high-speed trains
Choi Eun-Suk ; Chin Won-Jong ; Lee Jung-Woo ; Kwark Jong-Won ; Kang Jae-Yoon ; Kim Byung-Suk ;
Journal of the Korean Society for Railway, volume 9, issue 1, 2006, Pages 125~130