Quarterly Report of RTRI
Online ISSN : 1880-1765
Print ISSN : 0033-9008
ISSN-L : 0033-9008
Volume 41, Issue 3
Displaying 1-6 of 6 articles from this issue
PAPERS
  • Hiroaki SUZUKI, Hiroaki SHIROTO, Ayano TANAKA, Kazuhiko TEZUKA, Hideyu ...
    2000 Volume 41 Issue 3 Pages 106-111
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    A series of experiments for evaluating the railway riding comfort on curved sections were carried out with subjects riding on trains or mock-up vehicles. In this paper, we propose a riding comfort index on curved sections, which uses stationary lateral acceleration jointly with peak-to-peak lateral acceleration and show acceptable values of discomfort. This paper also proposes an index for evaluating the riding comfort of a tilting train passing transition curves, to which roll motion is added. In addition, we make it possible to quantitatively express the relationship between the discomfort of passengers and the tilt angle of the floor when a train stops on a canted curve.
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  • Yuusuke SATOH, Takefumi SHIMADA, Tadashi KOHIDA
    2000 Volume 41 Issue 3 Pages 112-116
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    Presently the pole positions on overhead contact lines of electric railways are detected by comparing data measured by electric inspection cars in reference to the measuring places. The detection is done aboard the electric inspection cars by a program method using an optical pole detector and a distance pulse generator installed on the wheel axle. The drawback of this method is that distance pulses are not generated due to sliding wheels. We developed a new pole position detecting system using a Doppler laser distance-measuring device and an ATS beacon position detector. Tests at RTRI made it clear that the Doppler laser device using two optical sensors could measure the distance exactly. Successive test results with the electric inspection car show that this device can measure the running velocity and distance when supplemented with an interpolate function. We confirmed the effectiveness of this system.
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  • Hiroki NAGASAWA, Takahiro FUKUTANI, Shun-ichi KUSUMI
    2000 Volume 41 Issue 3 Pages 117-119
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    For the maintenance of overhead contact line, it is important to know the exact state of contact wire wear in electric railways. A new type of measuring apparatus has been developed, which is sufficiently small to be installed on the roof of commercial car. The apparatus has an optical system composed of sodium vapor lamps and CCD line sensor cameras with optical filters. This apparatus detects the width of wear surface of wire, and calculates the residual height from the width. The measuring frequency of the cameras is 1 kHz. The new apparatus has been tested in a laboratory and in the field by using an inspection car. The results show that it can be used at the speed of 100 km/h in daytime at a standard deviation of measuring error of 0.3 mm.
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  • Masato UKAI
    2000 Volume 41 Issue 3 Pages 120-126
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    It is now practical to use continuously scanned images (CSI), taken by a line sensor camera, for inspection of railway facilities. Such inspection system has been under development since 1995. Railway facilities are so extensive that this system will provide an effective tool of taking those images. In this paper, we report the result of its application as an inspection system of tunnel wall deformation. Especially, we focus on the image processing technique to extract those deformations. We completed an original image processing database system and a graphical user interface for convenient and easy operation. This system enables us to diagnose the soundness and durability of tunnel wall at a higher accuracy level.
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  • Hideshi KAKISHIMA, Takafumi NAGATOMO, Hiroshi IKEDA, Takeo YOSHIOKA, A ...
    2000 Volume 41 Issue 3 Pages 127-130
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    In this study, we measured the acoustic emission (AE) and vibration of rolling bearings with an artificial defect on the raceway surface, investigated the detective capacity of AE method for such surface defect , and compared it with that taken from the vibration measurement.
    From the measurement results, we concluded that it was possible to detect a raceway surface defect in rolling bearings by measuring AE, and that the detective capacity of the AE method for the surface defect was the same level as that of the vibration measurement within the range of present measurement.
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  • Tomoki WATANABE, Kiyoshi KAWAGUCHI, Masamichi OGASA, Satoru HATSUKADE
    2000 Volume 41 Issue 3 Pages 131-135
    Published: 2000
    Released on J-STAGE: September 20, 2007
    JOURNAL FREE ACCESS
    Presently electric locomotives and electric multiple units are designed by assuming high adhesion performance. However, they often cause problems of slip and slide of wheels. We developed a "Vehicle Traction Tester" to facilitate the analysis of wheel slip and slide and other phenomena at running performance tests. A.C. traction motor currents always vary to make it impossible to grasp the instantaneous current vector from one-phase current as is usually measured. We introduced a "Vector Calculator" that uses two-phase currents so that we can see the instantaneous amplitude and phase of the current vector. Furthermore, we developed a new "Train Running Resistance Analyzer" that shows running resistance on a display on a real time basis and makes statistical data processing faster and easier.
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