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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 15, Issue 6 - Dec 2012
Volume 15, Issue 5 - Oct 2012
Volume 15, Issue 4 - Aug 2012
Volume 15, Issue 3 - Jun 2012
Volume 15, Issue 2 - Apr 2012
Volume 15, Issue 1 - Feb 2012
Selecting the target year
Sound Insulation Strategy for the Tunnel Noise in a High Speed Train
Kim, Seock-Hyun ; Lee, Ho-Jin ; Kim, Jung-Tae ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 315~322
DOI : 10.7782/JKSR.2012.15.4.315
In a tunnel, interior noise of a high speed train increases by 5dB~7dB. The reason is that the sound intensity of the acoustic field in the tunnel significantly increases by the reflected waves occurred in the closed space. Especially, the incident acoustic power largely increases on the outside of the compartment side panel and large transmission of noise is available through the side panel and the glass window. In this paper, the sound insulation strategy in the tunnel is proposed for the next generation high speed train under development. Specimens of the aluminum extruded panels, layered panels and double glazed window are manufactured and intensity transmission loss is measured according to ASTM E2249-02. Based on the measured data, problems in the sound insulation performance are diagnosed and the sound insulation strategy is reviewed on each panel and layered structures.
A Development of Automated Design and Structural Analysis Aided-Program based on GUI environment for Aluminum Extrusion Carbody Structures of Railway Vehicle for Design Engineers
Kim, Jun-Hwan ; Kang, Seung-Gu ; Shin, Kwang-Bok ; Lee, Young-Ju ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 323~328
DOI : 10.7782/JKSR.2012.15.4.323
The purpose of this study is to develop automated structural design and analysis aided-program of aluminum extrusion carbody structures for railway vehicle. This developed program is called "AUTO-RAP" and could perform simultaneously structural design and verification for railway carbody structures made of aluminum extrusion independent of expertise and experience of design engineers. Design engineers are able to conduct the knowledge-based design by providing database of existing aluminum extrusion or user-defined function. The design verification is automatically programmed to evaluate its structural integrity according to Korean Railway Safety Law or Urban Transit Safety Law. In addition, this program could automatically generate an executable file of various commercial finite element programs such as ANSYS and ABAQUS and CAD files such as .stp and .iges by GUI environment applications using MFC(Microsoft Foundation Classes). In conclusion, it is expected to contribute to reduce product design cost and time of carbody structures aluminum extrusions in railway industry.
A Study on the Effect Analysis of the Tilting Technology According to the Evaluation of Electric Power Consumption Energy of Rolling Stock
Kim, Dae-Sik ; Lee, Ki-Jun ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 329~333
DOI : 10.7782/JKSR.2012.15.4.329
In this paper, By the time that the tilting technology is adopted in railway rolling stock, we analyzed quantitatively energy saving by reducing the power consumption with the reduction of the operation time through the speed improvement and suggested the necessity to introduce tilting technology in the domestic rail vehicles. To achieve this purpose, the effect of energy saving by comparing and analyzing the power consumption during the operation by TTX HANVIT 200 and 8200 electric locomotives to pull the trains on the same line was suggested and the efficiency of the main devices was compared and analyzed by measuring the power consumption by a single unit. As the energy saving is the world topic, the studies on reducing energy usage goes on constantly in many areas. In addition, as of the time to improve the conventional tracks to speed up and change the signals, Tilting technology will be contributed to the management environment by enlarging the passengers' demand through the reduction of the operation time and saving energy using the existing infrastructure.
Effectiveness Evaluation of the Bogie Exchange and the Automatic Variable Gauge System using LCC Analysis
Chung, Kwang-Woo ; An, Joon-Yong ; Kim, Chul-Su ; Na, Hee-Seung ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 334~342
DOI : 10.7782/JKSR.2012.15.4.334
It is connected with various gauges existing in Euro-Asian continents. Such differences impedes the operation seriously as on the contact of railway tracks of different gauge the cargo must be either transshipped or the running assemblies of rail vehicles must be exchanged. Those operations are costly, time-consuming and require extended infrastructure together with very expensive storage and transshipment facilities at border-crossing point. Moreover, those operations extend transportation time considerably. Therefore, effectiveness of railway transportation systems significantly depends on track gauge change 1435/1520mm, which connects with complicated handling-shifting operations. The paper concerns assessment of effectiveness in strategical rail systems with gauge changing. The paper presents short description of transport system with gauge changing and initial assessment of shifting technologies. Method of system assessment comparison based on Life Cycle Cost model is described here as well.
An Evaluation on Derailment according to Running Safety of Next-Generation High Speed Train (HEMU-430X)
Sim, Kyung-Seok ; Park, Tae-Won ; Lee, Jin-Hee ; Jeong, Gi-Beom ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 343~351
DOI : 10.7782/JKSR.2012.15.4.343
With the cooperation of many research institutes and railway companies, the next generation high speed train is under development for many years. To confirm the safety requirement of the developed high speed train, multibody dynamic analysis is implemented. Through this analysis, railway derailment and lateral guiding force simulation was evaluated according to UIC code 518 OR for international railway vehicle. Test results were compared by limit value of safety criteria. Safety evaluation results, according to international standards, would provide basic reference data of ensuring safety speed and track radius curve. The safety of the train at the maximum speed is verified by numerical analysis results.
Strength Evaluation of Telescopic Sliding Doorstep Equipment for Railway Vehicle
Kim, Chul-Su ; Park, Min-Heung ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 352~356
DOI : 10.7782/JKSR.2012.15.4.352
Heights of a platform above the rail for the passenger train in the country are classified into two categories such as the low level (500mm; mainline) and the high level (1,135mm; metropolitan subway line) platforms. In order to operate similarly both a mainline railroad and a metropolitan subway line, as the requisite door safety system, it is necessary to develop the doorstep equipment of the rolling stock regardless of both the low and high level platforms. In this study, Structural analysis and mechanical strength test of doorstep equipments used for two types of platforms are performed on the supposition that the train only for the low level platform could stop in the both low and high level platforms.
A Study on the Leading Phase Operation of Single Phase PWM Converter Train
Kim, Baik ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 357~363
DOI : 10.7782/JKSR.2012.15.4.357
This paper presents a new operation method for the single phase PWM(Pulse Width Modulation) converter train. Recently, the trains adopting the PWM converter have become the majority in the electric locomotives since there are distinct advantages over the predecessors, which can be operated at near unity power factor. However, a slight modification of the control scheme makes this kind of vehicles run in the region of leading power factor. Although this feature seems to be of no significant use by itself, the leading phase operation can improve the voltage profile and the line loss of the feeding systems is decreased by compensating the reactive power loss along the line when it considered together with the feeding systems. This method is even more economical and efficient comparing with the installation of SVC that is mainly used for this purpose since the train can become a movable compensator. With the conditions and some essential formula for the leading phase operation, a new power factor control algorithm has been proposed to implement this scheme. The results of simulation through SIMULINK model show that the proposed method is suitable enough for practical use.
Measurement of 18GHz Radio Propagation Characteristics in Subway Tunnel for Train-Wayside Multimedia Transmission
Choi, Kyu-Hyoung ; Seo, Myung-Sik ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 364~369
DOI : 10.7782/JKSR.2012.15.4.364
This paper presents an experimental study on the radio propagation characteristics in subway tunnel at 18GHz frequency band which has been assigned to video transmission between train and wayside. The radio propagation tests are carried out in the subway tunnel of Seoul Metro using the antenna and communication devices of the prototype video transmission system. The measurement results show that 18GHz radio propagation in subway tunnel has smaller path loss than that of general outdoor radio environment. It is also cleared that the arch-type tunnels have smaller radio propagation losses than rectangular tunnels, and single track tunnels have smaller pass loss than double track tunnels. From the measurements, the radio propagation coverage is worked out as 520 meters. The curved tunnels which cannot have LOS communication between transmitter and receiver have large pass losses and fluctuation profile along distance. The radio propagation coverage along curved tunnels is worked out as 300 meters. These investigation results can be used to design the 18GHz radio transmission system for subway tunnel by providing the optimized wayside transmitter locations and handover algorithm customized to the radio propagation characteristics in subway tunnels.
Analysis of Eddy Current Loss on Permanent Magnets of Interior Permanent Magnet Synchronous Motor for Railway Transit
Park, Chan-Bae ; Lee, Hyung-Woo ; Lee, Byung-Song ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 370~375
DOI : 10.7782/JKSR.2012.15.4.370
In order to apply Interior Permanet Magnet Synchronous Motor(IPMSM) to the propulsion system of the railway transit, 110kW class IPMSMs with high-power density are designed as a concentrated winding model and a distributed winding model in this study. The concentrated winding model designed in this study is 6 poles/9 slots and the distributed winding model is 6 poles/36 slots. In general, the eddy current losses in the permanent magnets of IPMSM are caused by the slot harmonics. The thermal demagnetization of the magnet by the eddy current losses at high rotational speed often becomes one of the major problems in the IPMSM with a concentrated windings especially. A design to reduce eddy current losses in permanent magnet design is important in IPMSM for the railway vehicle propulsion system which requires high-speed operation. Therefore, a method to devide the permanent magnet is proposed to reduce the eddy current losses in permanent magnet in this study. Authors analyze the variation characteristics of the eddy current losses generated in permanent magnet of the concentrated winding model by changing the number of the division of the permanent magnets.
A study on the Reduction of the Stator iron loss on Permanent Magnet Synchronous Motor for Light Railway Transit Propulsion System
Park, Chan-Bae ; Lee, Hyung-Woo ; Lee, Byung-Song ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 376~380
DOI : 10.7782/JKSR.2012.15.4.376
A study on the iron-loss reduction of 110kW-class Interior Permanent Magnet Synchronous Motor (IPMSM) for Light Railway Transit (LRT) is conducted. In general, the iron loss of IPMSM depends on the characteristics of core material and non-oriented electrical steel is used as a core material of IPMSM. In order to reduce the iron-loss of IPMSM, both non-oriented electrical steel and grain oriented electrical steel are applied as core material. Iron loss of 110kW-class IPMSM can be reduced approximately 40% comparing to an existing IPMSM by applying grain oriented electrical steel to the stator teeth.
Achievements and Tasks of the SMRT Tunnel Monitoring System(TMS)
Park, Jong-Hun ; Kim, Man-Hwa ; Park, Ki-Hwan ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 381~387
DOI : 10.7782/JKSR.2012.15.4.381
This paper is aimed to analyze the achievements of the Tunnel Monitoring System(TMS), implemented in Seoul subway L5~L8, and to find out improved methods. By introducing the TMS, it is possible to inspect tunnel facilities for 24 hours a day while trains are operated. The inspection capability could be expanded, the accuracy was improved, and the cycle was shortened. The efficiency of manpower was improved and the surplus manpower could be used for other tasks of facilities maintenance. As a result, by introduction of the TMS, the amount of tunnel maintenance was increased by 225% and the train service troubles caused by facility problems were decreased by 53%.
The Effectiveness Analysis on the Joint Use of Bulk Cement Car
Kim, Kyoung-Tae ; Lee, Jin-Sun ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 388~393
DOI : 10.7782/JKSR.2012.15.4.388
Recently, various attempts are made to increase the efficiency of railway freight transport including bulk cement, the most important transport item of railway transport market. The major seven cement companies have started common use of private bulk cement car since April 2008 for the efficiency of railway freight transport. At that time, major seven cement companies owned 75% of whole bulk cement car. Railway companies forecasted that this project will decrease the amount of cost and transport time of freight car. With these data, it analyzed the effectiveness of the joint use of freight car on actual used data.
A Comparative study of Railway Heritage Conservation System between Japan and UK
Lee, Yong-Sang ; Chung, Byung-Hyun ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 394~401
DOI : 10.7782/JKSR.2012.15.4.394
Railway has been used as a transportation method since 18th century. Modern term of railway is defined as use of steam engine. Stockton & Darlington Railway in north western England firstly used steam engine. It was Manchester & Liverpool Railway which firstly ran systematized railroading system. Like this, railway had been developed in diverse forms in various countries, and these traditions are preserved well as time passes. Especially in UK, first country to run railway, has various methods to maintain railway cultural heritage. Japan also has organized railway culture protection system due to fast development of railway and many changes through privatization. In this research, railway cultural preservation systems of UK and Japan's are compated and lessons are looked for Korea. This paper chooses comparative and contrast method, and introduces laws, systems, and examples of two countries to find lessons.
Study on the Category of Safety Models for the Urban Railway
Seo, Yong-Jun ; Kook, Kwang-Ho ; Lee, Jeong-Ho ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 402~407
DOI : 10.7782/JKSR.2012.15.4.402
Since reports on trip delays or incidents often appear as accident articles on the press, the social criticisms and concerns on the safety of the urban railway are increasing. Therefore, a railway authority sometimes adopts an abstract safety goal like "let's build the urban railway to a masterpiece level" or "let's obtain an aeronautic safety level" to make citizens relieved and to alert involved persons. However with a vague goal, it is almost impossible to make an implementation plan systematic which helps the authority academically verify and validate if the goal is achieved or not. In this paper, the features of the railway safety are described and the safety models for securing the safety of the urban railway are surveyed and categorized. Based on the comparisons among the features and limitations of the models, we identify a more practical model which can be applied to the urban railway more effectively.
A Study on the Calculation of GHG Emission for Domestic Railroad Transport based on IPCC Guideline
Lee, Jae-Young ; Kim, Yong-Ki ; Lee, Cheul-Kyu ; Rhee, Young-Ho ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 408~412
DOI : 10.7782/JKSR.2012.15.4.408
Recently, new climate change mechanism after 2020 year has been accepted with the parties, and so government is pushing ahead the GHG reduction policies to achieve the effective results. Especially, it is essential to enhance the role of railroad in the public traffic system as well as to develop new cars with high energy efficiency for the GHG reduction of transportation sector. Thus, the calculation method of GHG emission of railroad should be established to manage the emission continuously. In this study, the calculation method of GHG emission of railroad was defined with Tier level considering its emission sources to refer to 2006 IPCC guideline for national GHG inventories. Also, the GHG emission of railroad at Tier 1 level was investigated using the activity data related to the amount of diesel and electricity consumption from 2008 to 2010. As a result, total GHG emission in 2010 was about 2,060 thousands ton CO2e, which have 73% of electricity and 27% of diesel. In future, the plans on the GHG reduction of railroad will be accomplished by the analysis of the detailed trends on the basis of the emission management of Tier 3 level under operating patterns. Therefore, it is important to develop the specific GHG emission factors of railroad in advance.
Single Degree of Freedom Hybrid Dynamic Test with Steel Frame Structure
Kim, Se-Hoon ; Na, Ok-Pin ; Kim, Sung-Il ; Lee, Jae-Jin ; Kang, Dae-Hung ;
Journal of the Korean society for railway, volume 15, issue 4, 2012, Pages 413~421
DOI : 10.7782/JKSR.2012.15.4.413
The purpose of this study is to evaluate the structural dynamic behavior under hybrid control system. The hybrid test is to consider the interaction between the numerical and physical models. In this paper, single degree of freedom hybrid test was performed with one-bay, two-story steel frame structure. One column at the first floor was selected as a physical substructure and one actuator was used for applying the displacement load in horizontal direction. El Centro as earthquake waves was inputted and OpenSees was employed as the numerical analysis program for the hybrid real-time simulation. As a result, the total time of the hybrid test was about 9.6% of actual measured seismic period. The experimental results agreed well with the numerical one in terms of the maximum displacement. In nonlinear analysis, however, material nonlinearity made a difference of residual strain. Therefore, this hybrid dynamic test can be used to predict the structural dynamic performance more effectively than shaking table test, because of the spatial and economic limitations.