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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 11, Issue 6 - Dec 2008
Volume 11, Issue 5 - Oct 2008
Volume 11, Issue 4 - Aug 2008
Volume 11, Issue 3 - Jun 2008
Volume 11, Issue 2 - Apr 2008
Volume 11, Issue 1 - Feb 2008
Selecting the target year
High Speed Rail Measurement System of HSR-350x
Kim, Sang-Soo ; Park, Choon-Soo ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 115~119
Korean Train Express (KTX) has opened to commercial traffic since 2004 at maximum speed 300km/h. As the speed of the train becomes higher, the conditions of the rail affect the behavior of the running train. To secure the safety and reliability of high speed railway, it is necessary to inspect rail irregularities and to maintain the rail regularly. The authors designed the high speed rain measurement system over 300km/h. And we installed the system to Korea High-speed Railway (HSR 350x). In this paper, we introduce the high speed rail measurement system for HSR 350x and show verification of the performance of the system through test runs.
Measurement and Analysis of Indoor Thermal Environment in Passenger Car
So, Jin-Sub ; Yoo, Seong-Yeon ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 120~125
The Ministry of Environment established a guide line Indoor Air Quality Management guidelines in Public Facilities in December 2006. As the items of the guideline,
(Carbon dioxide) and PM10 (Particulate matter). Therefore trains and subway need to control air quality. The indoor thermal environment in passenger car is very important for the enhancement of the amenity and health of passengers. Many researchers have studied it not for train but for building. So, in this study, we have performed thermal environment in passenger car (KTX, Mugunghwa, Saemaeul), and verified the relation between the PMV (Predicted Mean Vote) and PPD (Predicted Percent Dissatisfied) from September to October 2007. As a result, the average PMV value for each trains are 0.1, 0.22 for KTX, 0 for Mugunghwa, 0.1 for Saemaeul. So it satisfies the ASHRAE Handbook thermal environmental limit (-0.5 < PMV < +0.5).
Advanced Message Storing Method on mobilePOST SMSC
Song, Byung-Kwen ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 126~138
This paper proposes the preservation method that can effectively process short messages at mobilePOST SMSC(Short Message Service Center) platform on CDMA(Code Division Multiple Access). There are three techniques for the preservation method. First one is shared memory technique where several processes within the system share same memory to process transmission of short messages with maximum performance. Second one is to back-up messages in shared memory to the file system to prevent lost during system initialization or other unstable period. Third technique is that when transmission of short message was completed, finished message is moved from the shared memory to relational database for accounting purposes.
Design of Train Control Software Safety Evaluation Tool
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ; Kim, Hyung-Shin ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 139~144
Recent advances in embedded system technology have brought more dependence on automating train control. While much efforts have been reported to improve electronic hardware's safety, not so much systematic approaches to evaluate software's safety, especially for the vital software running on board train controllers. In this paper, we propose a new software tool to evaluate software safety for the train controller. We have reviewed requirements in the international standards and surveyed available tools in the market. From that, we identified necessary tests to meet the standards and proposed a tool that can be used during the whole software life cycle. We show the functional architecture and internal components of the tool. Our tool is unique in that it is a comprehensive tool specifically designed for software safety evaluation while other tools are not.
A Study on Conceptual Design and Dynamic Model of High-Speed Roller Rig for Maintenances
Shin, Kwang-Bok ; Goo, Jun-Sung ; Lee, Dae-Bong ; Lee, Eun-Gyu ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 145~150
The objective of this research is to design the roller rig for the maintenances of high-speed train bogies operated on the tracks. Roller rigs have been studied and researched to develop the faster, safer and more efficient railway system. It is to reduce the time of testing vehicles and to make as wide a range of tests available as possible. Therefore, it is very important issue to check and evaluate the dynamic responses of high-speed train after several years of operation. This paper presents a study on the conceptual design and dynamic model to develop the roller rig for the routine maintenances of high-speed trains bogies with maximum speed of 350km/h. ANSYS was used to analyze the wheel/roller's contact behavior of driving axle and ADAMS was used to verify and analyze the dynamic behaviors of roller rig.
An Experimental Study on Effect of a Partitioned Electric Heating on Temperature Distribution in a Diesel Particulate Filter
Lee, Choong-Hoon ; Park, Sung-Chun ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 151~157
The DPF temperature distribution which has a great effect on regenerating the ceramic filter effectively was measured at 30 locations using K-type thermocouples. Five partitioned electric heaters were used for heating the ceramic filter and they are switched ON/OFF in order. Also, the temperature distribution in the ceramic filter was measured with varying the electrical power supply to the heaters and the mass flow rate of the air supply from a blower. The uniform distribution of the air flow velocity at the inlet of the DPF make that of the temperature in the ceramic filter. The difference in heating ability between the partitioned heaters had a great effect on the temperature distribution in the ceramic filter.
Risk Assessment of Slopes using Failure Probability in Korean Railways
Kim, Hyun-Ki ; Kim, Soo-Sam ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 158~164
Abstract Infiltration of rainfall that may lead to reduce resistance force due to reduction of matric suction and to increase driving force due to increase of self weight makes the slope fail. There are many specifications to make slope stable based on factor of safety. Although result of slope stability analysis satisfy the specifications, slope failures triggered by rainfall are frequently occurred in reality because slope stability analysis cannot consider uncertainty of each soil properties. This is why conventional analysis has limitation and development of alternative method is needed. So it is suggested to adopt the reliability analysis rather than design based on factor of safety into designing safer structure. Through the evaluation of handicaps for the factor of safety based design, calculation of soil properties by site investigation, and reliability analysis considering distribution of each soil properties, distribution of failure probability in railway slope is obtained. Then, Risk assessment of slopes in Korean railway is executed from the results. Damage loss and incoming loss are considered as the loss. Using these results, it is possible to make proper countermeasure or efficient maintenance.
Maintenance and Dynamic Behavior of Advanced Spherical Bearings under Railway Open-Steel-Plate-Girder Bridges
Choi, Eun-Soo ; Lee, Hee-Up ; Lee, Seung-Yong ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 165~175
Line type rigid bearings for Open-Steel-Plate-Girder railway bridges have several problems in service, and they are unstable structurally. A series of lateral resistance tests were performed for a retrieved line type bearing. A spherical bearing with advanced maintenance-capability and a device to resist the up-lift was developed and replaced the existing ones. An experiment of maintenance for a new spherical bearing under real Open-Steel-Plate-Girder bridge was conducted and their good maintenance performance was proved. Also, a test against up-lift was performed for the bearing. The dynamic behavior of the bridge was measured and analyzed for the two cases of the existing and replaced bearings. Therefore, the suitability of the new spherical bearings on the railway bridge was improved.
An Experimental Study of the Curve Squeal Noise
Kim, Kwan-Ju ; Park, Jin-Kyu ; Kim, Beom-Soo ; Kim, Jae-Chul ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 176~181
This paper presents results from experimental analysis of a friction-driven wheel responsible for generating wheel squeal noise. Squeal noise generating mechanism has been examined under the laboratory condition by the model rig on a small scale. Creep characteristics and squeal noise were observed by changing the possible variables, such as relative velocities and friction coefficients in time- and frequency-domain.
Characterization of Volatile Organic Compounds Emission from Interior Materials of Railway Passenger Cabin
Cho, Young-Min ; Park, Duck-Shin ; Kwon, Soon-Bark ; Park, Eun-Young ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 182~187
The environmental significance of indoor air quality is gaining more attention. Especially, the contamination of indoor air by volatile organic chemicals (VOCs) has become a serious environmental concern. We investigated the VOCs emissions from some interior materials used in the conventional railway passenger cabin. The seat cover and the flooring of cabins were used as testing materials, and they were put in a clean environmental chamber. The temperature and relative humidity was kept at
, respectively. It was found that these interior materials emitted significant amount of VOCs under constantly ventilated condition. The flooring emitted more halogenated VOCs than the seat cover, because it is made of PVC, which contains many chlorine atoms. However, the emission gradually decreased over time. Because the VOCs emission from interior materials may threaten the health of passengers in the cabin, interior materials emitting less VOCs should be used.
Development of Brake Disk Materials with Ni-Cr-Mo
Goo, Byeong-Choon ; Lim, Choong-Hwan ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 188~194
Brake disks for rolling stock are exposed to thermal fatigue during braking, and thermal cracks occur on surface of disks. Thermal cracks can cause serious accidents, deterioration of braking performance and increase of maintenance cost due to frequent exchange of friction materials. In this study, candidate materials with high-heat resistance were selected by searching the literature. By using cast specimens made of the candidate materials, chemical composition, crystal structure and graphite type were analyzed. In addition, friction coefficient and wear were measured and compared with values for the disk material in service. As a result, it was shown that the NiCrMo has highest tensile strength and lowest friction coefficient and the disk material in service has the most stable friction characteristics.
The Displacement Limit at the End of an Approach Slab for a Railway Bridge with Ballastless Track
Choi, Jin-Yu ; Yang, Shin-Chu ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 195~202
The transition area between a bridge and an earthwork is one of the weakest area of track because of the track geometry deterioration caused unequal settlement of backfill of abutment. In case of a ballastless track, the approach slab could be installed to prevent such a phenomenon. But, if there is occurred the inclined displacement on the approach slab by a settlement of the foundation or formation, the track is also under the inclined displacement. And this defect causes reducing the running stability of a vehicle, the riding comfort of passengers, and increasing the track deteriorations by excessive impact force acting on the track. In this study, parametric studies were performed to investigate the displacement limit on the approach slab to avoid such problems. The length and the amount of unequal settlement of approach slab were adopted as parameter for numerical analysis considering vehicle-track interaction. Car body accelerations, variations of wheel force, stresses in rail, and uplift forces induced on fastener clip were investigated. From the result, resonable settlement limit on the end of an approach slab according to slab length was suggested.
Designed and Implement of the Discrete Time Kalman Filter for Speed Estimation of the Sensorless Hub Wheel Motor
Jeon, Yong-Ho ; Yee, Gi-Seo ; Cho, Whang ;
Journal of the Korean Society for Railway, volume 11, issue 2, 2008, Pages 203~210
Since hub wheel BLDC Motor consisted of wheel and BLDCM (Brushless DC Motor) without gear reducer has high efficiency and low operation noise, it can be utilized to a driving wheel at some light rail systems. However, installing sensors for speedometer on a Hub-Wheel motor is not easy, so it requires a different speed control mechanism method for speed measurement. This paper introduces a speed control method based on simple mathematical model which uses discrete Kalman Filter to estimate and control the speed of the motor.