Quarterly Report of RTRI

PAPERS

Repair Method for Ballasted Track by Composite Filling Material Consisting of Water Glass and Polymer

Takahisa NAKAMURA, Katsumi MURAMOTO

2010 Volume 51 Issue 2 Pages 55-59
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.55

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When ballasted tracks include a high-mix ratio of fine particles, track irregularities tend to increase soon after track maintenance performed by tamping because the density change of the ballast is large, and such work impairs the density of the ballast. Therefore, in this study, we developed a method to fill gaps under sleepers with a filling material for the realignment of tracks without impairing the density of the existing ballast. The authors also performed testing to confirm the validity of the method. The results confirmed that this technique is an effective approach for the repair of ballasted tracks.

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Expansion of Application Range of Continuous Welded Rail Integrated with Turnout

Hiroo KATAOKA, Hideaki YANAGAWA, Yuichi IWASA, Yuuki NISHINOMIYA

2010 Volume 51 Issue 2 Pages 60-65
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.60

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We used the finite element method to establish a technique to precisely evaluate the axial force, expansion and contraction of rails in areas with turnouts in succession integrated with a CWR on ballasted track laid on an earth roadbed or on ballastless track of viaduct. We carried out an on-site test in a CWR track section where two turnouts are located in succession integrated with a CWR on a ballasted track, and the test results were compared with the analytical results. We applied this technique to analysis of the rail axial force characteristics of a CWR connected with a turnout directly fastened to viaducts, and clarified the relationship between girder bridge length, girder arrangement and axial force in rails.

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Occurrence Conditions and Preventive Methods for Solidification Cracks in Alumino-thermic Welds

Hajime ITO, Yoshihiro TERASHITA, Mitsumasa TATSUMI, Ryu-ichi YAMAMOTO, ...

2010 Volume 51 Issue 2 Pages 66-71
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.66

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Although improvements in ultrasonic inspection methods have brought about a reduction in the incidence of alumino-thermic weld failure, some failures still occur in the early stages after installation of weld as a result of solidification cracks. It is considered that such cracks arise from rail movement in the longitudinal direction just before the weld metal solidifies. However, the details of the related occurrence conditions are not yet clear. In this study, the occurrence conditions of solidification cracking and preventive methods for weld failures caused by such cracking were discussed based on simulative testing of solidification cracks. As a result, the occurrence conditions were clarified, and preventive methods and detective methods for solidification cracks were suggested.

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An Algorithm for Freight Train Driver Rescheduling in Disruption Situations

Keisuke SATO, Naoto FUKUMURA

2010 Volume 51 Issue 2 Pages 72-76
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.72

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Railway operators adjust timetables and reschedule rolling stock operation plans and crew duties accordingly when operations are disrupted. This paper discusses the problem of rescheduling driver assignment to freight trains after timetable adjustment has been completed. We model the problem as an integer programming problem with set-covering constraints, and solve it using the column generation technique. Numerical experiments using real data have revealed that the method can provide a quality driver-rescheduling plan within an acceptable computing time.

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A Method to Evaluate the Economic Burden on Passengers Affected by Rail Transport Disorder

Masai MUTO, Toru SHIBATA

2010 Volume 51 Issue 2 Pages 77-81
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.77

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This study focused on a method to evaluate the economic burden on passengers affected by rail transport disorder. The authors developed a choice model for passenger behavior in regard to the two major options of either taking an alternative route or waiting for train services to be resumed. The value of time during the period of disorder was calculated using a model parameter ratio involving the travel time and the applicable fare. We accordingly proposed a new evaluation index to indicate the economic loss as calculated by the product of the value of time and the total time lost by all passengers.

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An Approach for Real-time Estimation of Railway Passenger Flow

Yoichi SUGIYAMA, Hiroshi MATSUBARA, Shuichi MYOJO, Kazuki TAMURA, Naoy ...

2010 Volume 51 Issue 2 Pages 82-88
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.82

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The ability to obtain passenger flow information in real time is expected to prove useful in application to railway traffic operations. In this report, forecasting of the number of gate passages according to the time of day was attempted using past data from automatic ticket-checking gates, and the number of passages by each origin station was estimated using the number of gate passages. As attributes of daily passage data were apparent, two prediction approaches were found to be applicable to stable data and irregular data. Consequently, the applicability criteria for each approach were clarified. Moreover, accurate forecasting of the number of OD (combination of Origin and Destination) passages was performed using the forecasting model developed.

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Development of Evaluation Method of Risk of Train Driver's Error with Consideration on Inducement Factors

Yumeko MIYACHI, Toru SHIBATA

2010 Volume 51 Issue 2 Pages 89-94
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.89

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In order to find an effective measure in limited time and budget, it is necessary to judge the priority of the purposes and effects of measures. One important factor s is the degree of risk. We improved FMEA for the risk assessment of human error phenomena, and developed it to a new risk assessment technique. In order to use this technique, sufficient background factors of accidents and incidents need to be analyzed. Moreover, for preventing human errors, not only the error phenomena but also the causative factors should be grasped. We combined the results of assessing the risk of error phenomena with causes of errors, to create a method of managing and preventing human errors which could be adopted in a railroad office.

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Development of Evaluation Method of Safety Climate in Work Site

Yumeko MIYACHI, Akiko MURAKOSHI, Hajime AKATSUKA, Ayako SUZUKI

2010 Volume 51 Issue 2 Pages 95-100
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.95

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There are many factors which specify the place of the work and kind of job. Among these factors, these factors are closely related with safety. "Safety Climate" is consciousness and attitude for these factors. We analyzed the contents of the items used by the past investigations, and conducted an investigation by which the importance of these contents were evaluated. We developed a technique to evaluate the safety climate of the place of work based on these analysis and results of the investigation. Furthermore, we reviewed many past researches and examined the subjects for the safety climate research which should be studied in the future.

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Fundamental Study on the Effect of High-frequency Vibration in the Vertical and Lateral Directions on Ride Comfort

Chizuru NAKAGAWA, Ryohei SHIMAMUNE, Ken WATANABE, Erimitsu SUZUKI

2010 Volume 51 Issue 2 Pages 101-104
Published: 2010
Released on J-STAGE: June 04, 2010

DOIhttps://doi.org/10.2219/rtriqr.51.101

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To develop a more suitable method of evaluating the ride comfort of railway vehicles, including high-speed trains, a fundamental study was conducted on passenger sensitivity to various frequencies of vibration with respect to ride comfort. Experiments were performed on 54 subjects using an electrodynamic vibration system that can generate vibrations in the frequency range of 1 to 80 Hz in the vertical and lateral directions. The results of the experiments indicated that the subjects tended to experience greater discomfort when exposed to high-frequency vibrations than presumed by Japan's conventional Ride Comfort Level assessment method.

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