Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
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Volume 55, Issue 2
Displaying 1-9 of 9 articles from this issue
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PAPERS
  • Wear Modes of Contact Wire and Contact Strip under Electric Current Condition
    Chikara YAMASHITA, Atsushi SUGAHARA
    2014 Volume 55 Issue 2 Pages 67-72
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.67
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    To suggest measures for reducing wear of current collecting materials such as contact wires and contact strips, it is necessary to understand actual phenomena generated at the point of electric contact. For this study on classification of wear modes and transition conditions between hard drawn copper contact wire and iron-based sintered alloy contact strips, a linear wear testing method was newly introduced. As a result, it was found that the contact temperature which was estimated from the contact voltage depended on electric current and contact load. Consequently it was possible to classify wear modes of the current collecting materials under electric current conditions into three types depending on the maximum contact temperature.
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  • Measurement of the Contact Force of the Pantograph by Image Processing Technology
    Tatsuya KOYAMA, Mitsuru IKEDA, Shigeyuki KOBAYASHI, Kotaro NAKAMURA, S ...
    2014 Volume 55 Issue 2 Pages 73-78
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.73
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    Contact force between a pantograph and catenary is one of the most important indices for evaluating the contact performance of the pantograph-catenary system. Hence, some contact force measuring methods have been developed. However, currently used measurement methods have some problems. Firstly, the installation of sensors in a panhead could affect the dynamic characteristics of the pantograph. Secondly, they need data transmitting equipment, because built-in sensors are set under high-voltage condition. Thirdly, some kinds of pantographs cannot be equipped with sensors in a panhead because of structural restriction. To eliminate these problems, the authors have developed a new contact force measuring method by using image processing sensors mounted on the rooftop of a train.
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  • Improvement of Control Method for Fixed Energy Storage System
    Takeshi KONISHI, Tsurugi YOSHII, Hidenori SHIGEEDA
    2014 Volume 55 Issue 2 Pages 79-85
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.79
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    A new control method was developed, which ensures that an adequate constant power is supplied to electric rolling stock, while a storage unit is kept at a middle state of charge for subsequent powering or regenerating phases. A prototype storage system, applying the developed control method and employing electric double layer capacitors (EDLCs) as the storage unit, was built. Tests were performed using a railway test line and electric rolling stock, and it was confirmed that the system could charge or discharge according to powering/regenerating of electric rolling stock.
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  • Methods for Analyzing Passenger Flows During Train Traffic Disruption Using Accumulated Passenger Data
    Taketoshi KUNIMATSU, Chikara HIRAI
    2014 Volume 55 Issue 2 Pages 86-90
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.86
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    When rescheduling train traffic after an operational disruption, train operation companies endeavor to take passenger flows into account. In this paper, a method was developed utilizing accumulated passenger data and records of arrival and departure times of each train to estimate passenger flows in such situations. The first step was to devise a visualization method to understand the relationship between rescheduling arrangements and passenger flows. Multiple regression analysis was also applied to collected data from the previous twelve months in order to develop a model for estimating passenger flows during traffic disruption. The methods are verified by applying them to actual cases of train traffic disturbances, which confirmed their reliability and effectiveness.
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  • Development of a Method to Evaluate Ease of Intermodal Transfer between Rail and Bus Services Considering the Characteristics of a Station's Surroundings
    Takamasa SUZUKI, Masai MUTO, Masakazu YAMAMOTO
    2014 Volume 55 Issue 2 Pages 91-97
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.91
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    This research aims to establish a method for evaluating the convenience of rail to bus transfer routes, focusing on physical and structural characteristics. An online survey was conducted to obtain passenger opinion about rail to bus transfer convenience. With the data obtained, a model was developed to evaluate the convenience in making such transfers, in order to quantify the effect of physical characteristics of transfer routes on such an evaluation. Besides horizontal walking distances, use of stairs, features outside stations, including safety concerns and bus stop structures, were also considered. The developed models were then applied to a sample case to demonstrate how transfer convenience can be evaluated in practice.
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  • Development of Train Location Detection Methods for Signalling
    Mitsuyoshi FUKUDA, Hiroyuki SUGAHARA, Akihiro GION, Yuto ONO, Takayasu ...
    2014 Volume 55 Issue 2 Pages 98-104
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.98
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    The exact detection of train positions is a prerequisite for operational safety. Nowadays, in order to detect positions more accurately and to reduce the cost of ground equipment, a great many of the systems used for these calculations are on-board. However, existing on-board systems encounter problems such as calculation errors due to wheel slip and slide. Consequently, a new train location detection method for signalling was developed using an inertial sensor and/or a millimeter wave. This paper outlines the method in question and reports on results obtained through field tests.
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  • Development of a Rail Brake Derived from Linear Motor Technology
    Yasuaki SAKAMOTO, Takayuki KASHIWAGI, Takashi YONEYAMA, Shin-ichi SAGA
    2014 Volume 55 Issue 2 Pages 105-111
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.105
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    Studies have been carried out on a rail brake developed by applying a linear induction motor technology, called LIM-type rail brake. This brake is capable of generating braking forces without contact. In addition, this method decreases the rise in rail temperature, and on-board supply of electric power is not required by using dynamic braking. It is however necessary to install this brake in the limited space between front and rear wheels of the bogie. A prototype rail brake system was designed and built and its electromagnetic characteristics were examined on a test track in RTRI. These investigations revealed that the LIM-type rail brake could be applicable for practical use.
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  • 5 Tesla Class REBCO (Rare Earth-Ba-Cu-O) Superconducting Magnet with a Simplified Cooling System
    Katsutoshi MIZUNO, Masafumi OGATA, Ken NAGASHIMA
    2014 Volume 55 Issue 2 Pages 112-118
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.112
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    REBCO coated conductors have several characteristics which are superior to other superconductors. For example, its critical current is quite high even in the presence of high magnetic fields. Therefore, REBCO coated conductors make it possible to raise the operational temperature of superconductor applications. In turn, higher operational temperatures mean that the magnet cooling system consumes less energy. In the case of Maglev applications, it also means downsizing of the on-board power source and a reduction in the overall weight. A trial REBCO magnet that capable of generating 5 T (Tesla) was built. The magnets demonstrated that a magnetic flux density of 5 T was achievable at 45 K.
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  • Characteristics of a Magnetic Refrigerator with New Magnetocaloric Materials
    Yoshiki MIYAZAKI, Koichiro WAKI, Yuuki ARAI, Katsutoshi MIZUNO, Keisuk ...
    2014 Volume 55 Issue 2 Pages 119-124
    Published: May 01, 2014
    Released on J-STAGE: May 28, 2014
    DOIhttps://doi.org/10.2219/rtriqr.55.119
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    The aim of this study is to put a cooling technology using a magnetocaloric effect to practical use for air conditioners of railway vehicles in order to save energy. New magnetcaloric materials which have larger a magnetocaloric effect compared with Gd have been developed in the region of room temperature. Nevertheless, little discussion exists about how much the new materials affect the properties of a magnetocaloric cooling system. Therefore, the characteristics of the cooling system with Gd and La(Fe0.84Co0.06Si0.10)13 have been studied experimentally and analytically.
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