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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 12, Issue 6 - Dec 2009
Volume 12, Issue 5 - Oct 2009
Volume 12, Issue 4 - Aug 2009
Volume 12, Issue 3 - Jun 2009
Volume 12, Issue 2 - Apr 2009
Volume 12, Issue 1 - Feb 2009
Selecting the target year
A Study on Development of Safety Index for Evaluating Railway Safety
Song, Bo-Young ; Moon, Dae-Seop ; Lee, Dong-Hun ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 443~449
This study propose a model for railway safety evaluation with which the safety of whole railway system can be evaluated. The evaluation model is to generate a safety index which quantitatively represent the degree of railway safety. Safety index is proposed a function of three indexes; an accident index, safety management index, and safety culture index. This paper describes the first result from the study on the safety target which will be a key starting point toward the development of safety evaluation model. It is recommended that the safety target be composed of several sub-targets that are apportioned to constituent components. It is coneluded that the classification of safety target influence on deciding components or attributes that constitute each sub-indexes; an accident index, safety management index, and safety culture index.
Development of Automatic Tool for Software Metrics Analysis for Railway Signaling System
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ; Kim, Yong-Kyu ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 450~456
In accordance with the development of recent computer technology, the dependency of railway signaling system on the computer software is being increased further, and accordingly, the testing for the safety and reliability of railway signaling system software became more important This thesis suggested automated an analysis tool for S/W metrics on this railway signaling system, and presented its result of implementation. The analysis items in the implemented tool had referred to the international standards in relation to the software for railway system, such as IEC61508 and IEC 62279. This automated analysis tool for railway signaling system can be utilized at the assessment stage for railway signaling system software also, and it is anticipated that it can be utilized usefully at the software development stage also.
A CFD Analysis of Flow Velocity at Inlet of a Diesel Particulate Filter according to the Curved Duct Connection Conditions
Lee, Su-Rvong ; Ko, Young-Narn ; Lee, Choong-Hoon ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 457~464
The now velocity distribution at inlet of diesel Particulate filter (DPF) which is connected to each curved duct was simulated using
. Three kinds of models which describe the shapes of the curved duct ware used for the CFD simulation. The simulation results were compared with the experimental data of velocity distribution which was obtained using a Pitot tube and 2-D positioning machine. At the
curved connecting condition, the CFD simulation results of flow velocity distribution at inlet of the DPF showed a horse hoop shape shifted from the axial center line of the DPF. The CFD simulation results agree reasonably with those of the experiments.
Dynamic Characteristics of the Noise and Vibration of High-speed Train's Wheelset using Time-varying Frequency Analysis
Lee, Jun-Seok ; Choi, Sung-Hoon ; Kim, Sang-Soo ; Park, Choon-Soo ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 465~471
In this paper, a relationship between the noise and vibration of a high-speed train's wheelset is examined by using time-varying frequency analysis with random data analysis which together contributes to a reduction in the number of experimental running. The noise and vibration of the wheelset is mainly caused by an interaction between the wheel and railway which shows in non-stationary characteristics. For the analysis, they are measured by some microphones and accelerometers, and those signals are post-processed by time-varying frequency analysis with random data analysis. From the analysis, their methods are useful for analyzing the noise and vibration of high-speed train's wheelset.
Stability Analysis for CWR on the Railway Bridges by Linearized Method
Choi, Young-Gil ; Oh, Ju-Won ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 472~480
The stability analysis for CWR is difficult in the theory itself because both geometric and material nonlinearity should be considered. Also the analysis results are varied according to the loading history. In contrast to the complexity in the theory, the analysis results for CWR on the railway bridges are quite simple and can be predicted because of a small buckling effect and its negligible nonlinearity. In this study, refined nonlinear analysis methods for the stability analysis of CWR on the railway bridges were developed which consider only material nonlinearity beeause the effects of geometric nonlinearity are nominal. In this study, the analysis results can be found within limited number of iterations with idealized linear force-displacement relationship. From the analysis result comparisons, it was found that the stability analysis for CWR on the railway bridges can be performed effectively by this method.
Aggregate Criterion for Paved Track Considering Recycling of Railway Ballast
Lee, Il-Wha ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 481~487
On the paved track, the railway ballast is used as aggregate for the filling layer using the pre-packed concrete method. The condition of ballast as the paved track aggregate ensure that the compressive strength, particle distribution size for the pouring and surface clearance to increase the adhesive strength with mortar. It is profitable to recycle the existing railway ballast as a economical supply. In order to increase recycling characteristic, it is necessary to apply the similar criterion which does not exceed the conventional railway ballast criterion. Consequently, this paper was to investigate physical characteristics of existing ballast, particle size distribution, compressive and flexural strength, bearing capacity and filling capacity to prepare the aggregate's recycling. As a result, optimized aggregate criterion is suggested.
A Stochastic Transit Assignment Model for Intercity Rail Network
Kwon, Yong-Seok ; Kim, Kyoung-Tae ; Lim, Chong-Hoon ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 488~498
The characteristics of intercity rail network are different from those of public transit network in urban area. In this paper, we proposed a new transit assignment model which is generalized form of deterministic assignment model by introducing line selection probability on route section. This model consider various characteristics of intercity rail and simplify network expansion for appling search algorithms developed in road assignment model. We showed the model availability by comparing with existing models using virtual networks. The tests on a small scale network show that this model is superior to existing models for predicting intercity rail demand.
Geoid Height Estimation Using Rail-road Reference Points
Heo, Joon ; Song, Yeong-Sun ; Kim, Sung-hoon ; Moon, Cheung-Kyun ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 499~505
This paper evaluated applicability of railroad reference points for determinating geoid heights. For this research, reference points on the Honam express raildroad which contain ellipsoid heights estimated by GPS/Leveling and orthometric heights by leveling were used. Geoid heights were calculated uisng orthometric and ellipsoid heights of 360 railroad reference points, and the RMSE's with respect to different intervals of reference points were analysed which were induced by interpolation methods. The results showed that no significant difference of RMSE's among interpolation. methods. RMSE's of 0-4km interval of reference points were determined within 2cm and 5-8km were within 3cm. Also, this research confirmed that GPS leveling with Geoid model is not auurate enough to be used for railroad surveying as yet.
Identification of Track Irregularity by Frequency-Domain Transfer Function
Kim, Jae-Cheon ; Kwon, Soon-Jung ; Yin, Jing-Lin ; Lee, Hyeung-Jin ; Kim, Man-Cheol ; Shin, Soo-Bong ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 506~511
An algorithm for identifying track irregularities along the railway is presented. A baseline frequency-domain transfer function based on the equivalent SlSO(Single Input Single Output) model is defined at the intact condition between the measured track geometry of the ground displacement and the acceleration measured at a location in a train. The pre-defined transfer function at the intact condition is used inversely to predict track geometry in time with the currently measured acceleration at the same location in a train. The predicted track geometry is compared in time with that of the baseline values at the intact condition. The difference between them is calculated as an error in time and used to identify the track irregularities. An irregularity index is proposed as the ratio between the moving variance of the error at the current inspection and that at the intact condition. A 3D numerical simulation study has been carried out with a train model to verify the validity of the presented algorithm. In the analysis for the simulation, the track geometry has been considered as the displacement boundary condition varying in time.
A Study on the Friction Stir Welding Properties of A6005 Extruded Aluminum Panels
Park, Young-Bin ; Koo, Jeong-Seo ; Goo, Byeong-Choon ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 512~517
Extruded aluminium panels have been widely used for railway vehicle structures because -of their light specific weight and other merits. In the past, GMAW (Gas Metal Arc Welding) and GTAW (Gas Tungsten Arc Welding) were mainly used to join aluminium panels. But recently friction stir welding (FSW) is widely used due to its lots of advantage. In this study aluminium A6005 which is used for car body structures was chosen. The influences of main parameters on mechanical properties such as: pin (tool) rotating speed, pin transition speed, shoulder, diameter, pin length and tilting angle were examined. Optical microscope and scanning electron microscope (SEM) observation, micro hardness tests, and tensile tests were carried out.
A Study on the Comparison of Structural Performance Test and Analysis for Design Verification of Bimodal Tram Vehicle Made of Sandwich Composites
Ko, Hee-Young ; Shin, Kwang-Bok ; Jeong, Jong-Cheol ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 518~525
This paper describes the evaluation of structural performance test and finite element analysis to verify the design of Bimodal Tram made of sandwich composites. The sandwich composite applied to vehicle structure was composed of a aluminum honeycomb core and WR580/NF4000 glass fabric/epoxy laminate composite facesheet. The load tests of vehicle structure were conducted for vertical load, compressive load, torsion and modal analysis according to JlS E 7105. The structural Integrity of vehicle was evaluated by the measurement of displacement, stress and natural frequency obtained from dial gauge, strain gauge and gravity sensor, respectively. And finite element analysis using ANSYS v11.0 was done to compare with structural test. The results showed that the displacement, stress and natural frequency were in an good agreement with those of structural analysis using the proposed finite element models.
A Study on the Possibilities of PRT Applications
Lee, Jin-Sun ; Kim, Kyoung-Tae ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 526~534
PRT(Personal Rapid Transit) can be described as a system of driverless taxicabs, that. automatically take passengers to their destinations along dedicated guideways, without intermediate stops.It is ideally suited as a short feeder transportation for on-demand circulation operations at train stations, airports, office complex, amusement park and shopping center. This PRT study do suggest that a PRT system could provide a high level of mobility to the commuters making work trips, workers making work, shopping and other non-work trips, residents making shopping and other non-work trips and recreational riders.This study presents the possibilities of PRT applications in national level. As the technology continues to advance, there may be opportunities to improve the reliability, and efficiency of our future public transportation systems.
A Study on the Assessment of Residual Life Span for Old Type Signalling Equipment
Shin, Ducko-Shin ; Lee, Jae-Ho ; Shin, Kyung-Ho ; Kim, Yong-Kyu ; Kang, Min-Soo ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 535~541
The reliability of control system composed of electronic parts has been studied by DoD since 1960, and has been undertaken mainly by Europe for railways. Especially in Korea, a study on reliability of signalling equipment has been taken since 2000, requiring reliability test for effective maintenance of old type signalling equipment which no longer has information on its past reliability. This study evaluates the reliability test in units of parts for old type signalling equipment; for instance, failure rate in units of parts, or failure data during operation; which was utilized without its consistent reliability monitoring and analysis data for over 20 years. Also, reliability change at this point in time has been estimated by using residual life span function, and a model which can evaluate the possibility of extended operation through stress acceleration test has been developed. This model will be utilized to establish future maintenance policy for train operating company's operation on old type signalling equipment.
Measuring the Efficiency in Korean Railway Transport using Data Envelopment Analysis
Kim, Hyun-Woong ; Kook, Kwang-Ho ; Moon, Dae-Seop ; Lee, Jin-Sun ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 542~547
The objective of this paper is to measure the relative technical efficiency of Korean railway transport service. Previous studies on the efficiency in Korean railway service have carried out before the structural reform of Korean railway industry in 2004, whereas this study used the latest data which reflected the impact of reform. We analyzed the efficiency in Korean railway transport by means of measuring the technical efficiencies of other countries, these were estimated with data envelopment analysis. Using data from 22 railway operators over the period
, the results indicate that the Korean railway transport has been operated efficiently as compared with others.
A Study of the Application of Digital Photogrammetry to Railroad Rock Slope Investigation System
Ahn, Tae-Bong ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 548~556
In order to evaluate applicability of rock cut-slope investigation system, typical clinometer and photogrammetry investigation system were used for rock slopes; first for 7 discontinuities, and secondly, 10 discontinuities, and the results were compared. The first verification was performed depending on discontinuity joint shapes and slope angles, and the second verification was performed depending on shot time and shot locations. The results showed that differences of dip direction
. In the second verification test, the differences of dip direction was
, and dip
. The photogrammetry method for rock slope survey system is quite reliable when clinometer generally shows
errors due to surface roughness and investigator.
A Study on the Way of Purchasing Cost Reduction through Streamlining Procurement Tasks: Focusing on Rolling Stock and Components
Lee, Sun-Kwan ; Shin, Tack-Hyun ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 557~564
This study compared KORAIL's procurement tasks with that of other companies. after analyzing the institutional and operational problems in procurement tasks especially in the respect of rolling stock and components which are KORAIL's major purchasing items, this study presented the way of purchasing cost Reduction through improving and streamlining procurement tasks.
Development of Design Chart for Investigating an Additional Rail Stress and Displacement on CWR(I) - Design Chart for High Speed Railway Bridge
Choi, Il-Yoon ; Cho, Hyun-Cheol ; Yang, Sin-Chu ; Choi, Jin-Yu ; Yu, Jin-Young ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 565~573
Displacement of the bridge and additional rail stress due to interaction between track and bridge should be limited to the design criteria. Interaction analysis was conducted to investigate the displacement and additional rail stress on CWR in high speed railway bridge. Particularly, various parameters affecting interaction phenomena were taken into account in the analysis to enhance an applicability. These parameters included configuration of structure, stiffness of deck and support, steel/concrete bridge, ballast/concrete track and FM/MFM type etc. The results were presented in the form of the design chart which could be useful in preliminary design of the bridge.
Development of Design Chart for Investigating an Additional Rail Stress and Displacement on CWR(II) - Design Chart for Railway Bridge of Conventional Line
Choi, Il-Yoon ; Lim, Yun-Sik ; Yang, Sin-Chu ; Choi, Jin-Yu ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 574~581
Displacement of the bridge and additional rail stress due to interaction between track and bridge should be limited to the design criteria. Interaction analysis was conducted to investigate the displacement and additional rail stress on CWR in railway bridge of conventional line. Particularly, various parameters affecting interaction phenomena were taken into account in the analysis to enhance an applicability. These parameters included configuration of structure, stiffness of deck and support, steel/concrete bridge, ballast/concrete track and FM/MFM type etc. The results were presented in the form of the design chart which could be useful in preliminary design of the bridge.
A Study on Effects of Energy Saving by Applying Energy Storage System
An, Cheon-Heon ; Lee, Han-Min ; Kim, Gil-Dong ; Lee, Hi-Sung ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 582~589
The energy generated by braking vehicle would simply be converted into waste heat by its braking resistors if no other vehicle is accelerating at exactly the same time. Up to 45% of the tractive power of vehicles capable of returning energy to the power supply can be regenerated during braking and that this energy can be used to feed vehicles which are accelerating at the same time. Such synchronized braking and accelerating can not be coordinated, the ESS(energy storage system, here after) stores the energy generated during braking and discharges it again when a vehicle accelerates. The ESS is able to store and discharge energy extremely quickly, consequently enabling a complete exchange of energy between vehicles, even if they are not braking and accelerating at precisely the same time, as is most frequently the case in everyday service. The energy saving rate is related to the headway. If the headway is long/short, the energy saving goes up/down, When the headway is short, the ESS can not save much regenerative energy. The headway of SeoulMetro line 2 as the worst case is very short in Korea urban transit system. So, the energy saving rate will be very low. If the ESSs are applied to another railway system, we can expect that the effectiveness is better than the results of SeoulMetro line 2. This paper presents effects of energy saving obtained by applying the ESS to SeoulMetro line 2.
A Study on Failure Mechanisms of Composite Tubes with Woven Fabric Carbon, Glass and Kevlar/epoxy Under Compressive Loadings
Kim, Jung-Seok ; Yoon, Hyuk-Jin ; Lee, Ho-Sun ; Kwon, Tae-Soo ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 590~596
In this study, the failure modes and energy absorption characteristics of four different kinds of circular tubes made of carbon, glass, Kevlar and carbon-Kevlar hybrid fibres composites with epoxy resin have been evaluated. To achieve these goals, compressive tests were conducted for the tubes under 10mm/min loading speed. Based on the test results, the carbon/epoxy tube showed the best energy absorption capability, while carbon-Kevlar/epoxy tubes were worst. In the failure mode during crushing, both of the carbon/epoxy tubes and the glass/epoxy tubes were crushed by brittle fracturing mode. The Kevlar/epoxy tubes were collapsed by local buckling mode like steel, while the carbon-Kevlar hybrid tubes were collapsed by mixed mode of local buckling and lamina bending.
A Study on Optimum Design for Railway Alignment in Curve
Um, Ju-Hwan ; Yang, Sin-Chu ; Kim, Eun-Kyum ;
Journal of the Korean Society for Railway, volume 12, issue 4, 2009, Pages 597~603
In this study, Based on the optimization developed in Um et al. (2009), optimum design method of the alignment when building new lines and renewing existing ones is presented. The object function used for optimization is passenger comfort (
) which was proposed in BSI (2006). Other aspects of track/vehicle interaction will be treated in boundary conditions. And track/vehicle interaction analysis is peformed using KTX-II model. From the analysis results, it was found that the optimum alignments are affected by the angle (I) between adjacent straight lines and
combinations. Also the dynamic analysis confirms well the results from the simplified analysis. However, In the most cases, the
values in the dynamic analysis are higher than the simplified
values. If both methods are used when optimizing the alignment, it will be possible to design the alignments more rapidly and reliably.