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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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International Journal of Railway
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Korean Society for Railway
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Volume & Issues
Volume 5, Issue 4 - Dec 2012
Volume 5, Issue 3 - Sep 2012
Volume 5, Issue 2 - May 2012
Volume 5, Issue 1 - Mar 2012
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Pantograph-catenary Dynamic Interaction for a Overhead Line Supported by Noise Barrier
Belloli, Marco ; Collina, Andrea ; Pizzigoni, Bruno ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 55~64
DOI : 10.7782/IJR.2012.5.2.055
Subject of the paper is a particular configuration of overhead line, in which noise barrier structure is used as supports of the catenary instead of standard poles. This configuration is foreseen in case the noise barrier position is in conflict with the poles location. If the catenary is supported by the noise barrier, the motion that the latter undergo due to wave pressure associated to train transit is transmitted to the overhead line, so that potentially it influences the interaction between the catenary itself and the pantograph of the passing train. The paper focuses on the influence of such peculiar configuration on the quality of the current collection of high speed pantograph, for single and double current collection. The study has been carried out first with an experimental investigation on the pressure distribution on noise barrier, both in wind tunnel and with in-field tests. Subsequently a numerical analysis of the dynamics of the barrier subjected to the wave pressure due to train transit has been carried out, and the output of such analysis has been used as input data for the simulation of the pantograph-dynamic interaction at different speeds and with front or rear pantograph in operation. Consideration of structural modifications was then highlighted, in order to reduce the influence on the contact loss percentage.
Formal Analysis of Automatic Train Protection and Block System for Regional Line Using VDM++
Xie, Guo ; Hei, Xinhong ; Mochizuki, Hiroshi ; Takahashi, Sei ; Nakamura, Hideo ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 65~70
DOI : 10.7782/IJR.2012.5.2.065
This paper introduced a novel railway system, Automatic Train Protection and Block (ATPB) briefly, which is proposed to improve the efficiency of existing regional train lines with low cost in Japan. The biggest superiority of ATPB system is a great use of universal and mature technologies, such as GPS and regular mobile telephone networks, so that there is nearly no increment of trackside equipments in the reconstruction. Then in order to guarantee the system safety, a formal model of ATPB is established and analyzed by formal method VDM++. Firstly, the specification is specified by VDM++ formally without ambiguity. Secondly, its internal consistency is proved by discharging the proof obligations. And finally, its satisfiability is checked by systematic testing, which executes specification and checks the outputs against corresponding inputs.
A Study on Fatigue Crack Propagation of Rail Steel under Constant and Mixed Mode Variable Amplitude Loadings
Kim, Chul-Su ; Chung, Kwang-Woo ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 71~76
DOI : 10.7782/IJR.2012.5.2.071
Recently, axle load, operating speed and traffic density on railroads have had a tendency to increase and thereby cause additional pressure applied on used track. These operating conditions frequently result in service failure due to wear caused by wheel-rail contact and fatigue damage under cyclic loading. Among rail defects, the transverse crack, which has been the most dangerous type of fatigue damages, is developed from the subsurface crack near the rail running face and grows perpendicular to the rail surface. Therefore, it is necessary to investigate systematically the growth behavior of transverse crack for rail steel under mixed mode. In this study, the fatigue crack growth behavior of the transverse crack in rail steel was experimentally investigated under mixed-mode variable amplitude loadings.
Analysis of Distance between ATS and ATP Antenna for Normal Operation in Combined On-board Signal System
Kim, Minseok ; Kim, Minkyu ; Kim, Doogyum ; Lee, Jongwoo ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 77~83
DOI : 10.7782/IJR.2012.5.2.077
Railroad signaling systems are to control intervals and routes of trains. There are ATS, ATP, ATO and ATC system. Trains are operated in the section which is met on the signaling system because various signaling systems are used in Korea. Hence, trains are not operated in the section which is used in the other signaling system. To solve this problem, recently combined on-board system has been developed. The combined on-board system designed by doubling the ATS, ATP and ATC system to ensure the safety of system. The inductance of antenna is change and in return the resonance frequency of antenna is varied by the electromagnetic induction. Therefore, the information signal is not received exactly in the combined on-board system and in return accidents between trains occur. In this paper, electric model of the combined on-board system for considering the ATS and ATP antenna is presented. Moreover, the mutual inductance including the distance between the ATS and ATP antenna is calculated. As a result of the frequency response of the antennas, the mutual inductance met on operation range of resonance frequency is defined.
Safety Margin Evaluation of Railway wheel Based on Fracture Scenarios
Kwon, Seok Jin ; Lee, Dong Hyung ; Seo, Jung Won ; Kwon, Sung Tae ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 84~88
DOI : 10.7782/IJR.2012.5.2.084
Derailment due to wheel failure would cause a tremendous social and economical cost in service operation. It is necessary to evaluate quantitatively the safety with respect to high-speed train. Although the safety of railway wheel has been ensured by an regular inspection, all critical defects cannot be detected in inspection cycles and the wheel has been replaced because a defect quickly become critical for safety. Therefore, it is important to calculate quantitatively the fracture limit and remnant life of damaged railway wheel in wheel-rail system. In present paper, the critical crack size of wheel for high-speed train is simulated based on fracture scenario and the safety of wheel is evaluated.
Effective Notch Stress Method for Fatigue Evaluation of Welded Joints in a Steel Bridge Deck
Sim, Hyoung-Bo ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 89~92
DOI : 10.7782/IJR.2012.5.2.089
Effective notch stress, as an approach to evaluate the local stress at a notch (weld toe or root), is defined as the total stress assuming linear-elastic material behavior. This method can be effectively used to evaluate the fatigue performance of welded joints. In this study, finite element analysis results using the effective notch stress method were correlated with fatigue test results of rib-to-deck welded joints in a steel orthotropic bridge deck. Effective notch stress approach provided a good correlation with the crack pattern observed in the full-scale fatigue test. A higher effective notch stress at the critical weld toe than at the weld root was consistent with the dominant crack pattern observed at the weld toe during testing. The effective notch stress at the toe on the deck plate was about 80% higher than that on the rib; no cracks at the weld toe on the rib in the testing were observed. Maximum effective notch stress at the weld root occurred on the upper side of the root notch, which indicates that cracks are more likely to propagate into the deck plate, not into the weld metal. This is also consistent with the observed crack pattern in which the crack from the root propagated upward into the deck plate. No such crack pattern, propagating into the weld metal, was observed in the testing.
Effect of Crosswind on Derailment of Railway Vehicles Running on Curved Track at Low Speed
Hosoi, Takahiro ; Tanifuji, Katsuya ;
International Journal of Railway, volume 5, issue 2, 2012, Pages 93~101
DOI : 10.7782/IJR.2012.5.2.093
Owing to the lightening of railway vehicles and increased operation speeds, the reduction of running safety in the presence of crosswind is becoming an important problem. In particular, the running safety tends to decrease when vehicles run on curved track. When a crosswind acts on a vehicle negotiating a curve from the outer side, flange climbing can occur. In this study, a full-vehicle model was constructed using the multi-body simulation software SIMPACK, and a simulation of a bogie vehicle with two-axle trucks negotiating a curve was carried out to examine the running safety under the condition where a crosswind acts on the vehicle from the outer side of the curve. As a result, it was verified that the derailment coefficient of the first wheelset becomes large in the exit transition curve and the coefficient of the third wheelset does in the entrance transition curve, and this trend becomes pronounced at low operation speeds in the presence of a stronger crosswind. It was also shown that the critical derailment coefficients obtained by modified Nadal`s formula considering the effect of attack angle become close to the actual derailment coefficients at the timing that flange climbing occurs.