Quarterly Report of RTRI

PAPERS

Train Control System for Secondary Lines Using Radio Communications in Specific Area

Shigeto HIRAGURI, Mitsuyoshi FUKUDA, Hiroyuki FUJITA, Yuto ONO

2012 Volume 53 Issue 1 Pages 1-6
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.1

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An electronic token based blocking system has been used on secondary lines since the 1980s, and has contributed to more efficient administration of those sections. However, development of an alternative system is now required due to obsolescence and subsequent lack in supply of spare equipment. A new train control system was therefore designed relying on 2.4GHz band radio communication, for which a license is not required. This approach avoids having to replace the entire older system, and has demonstrated excellent performance in system replacement, since conventional equipment is still used as much as possible. The new system not only allows uncomplicated extensions of certain functions, but also overcomes some problems encountered with the conventional system. After performing field tests it was confirmed that the system performed basic functions without any problems.

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Development of a Lightning Surge Calculation Model for Level Crossing Signalling Equipment

Hideki ARAI, Hiroyuki FUJITA, Yuto ONO

2012 Volume 53 Issue 1 Pages 7-14
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.7

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The development of the effective and economical lightning protection measures is very important for railway signalling systems because lightning damage causes railway transportation disruption. This paper proposes a calculation model for lightning overvoltages on railway level crossing equipment. The calculation model consists of a propagation model of lightning surge along the rails and an equivalent circuit model of equipment. The authors validated the calculation model by comparison with field test results. This model is applicable for quantitative estimation of lightning protection measures of railway signalling equipment.

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Development of a Simulation Software to Calculate Fluctuations in Strength of Radio Frequency Noise Emitted from Electric Railway Systems into the Trackside Environment

Kunihiro KAWASAKI

2012 Volume 53 Issue 1 Pages 15-20
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.15

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Measurement methods and emission limits for radio frequency noise emitted from railway systems have already been established by the International Electro-technical Committee (IEC). Given the high cost and time consuming nature of the tests required to evaluate the effects of countermeasures aimed at containing the strength of emitted radio frequency noise within the allowable limits defined by the IEC standards, or, to grasp the characteristics of the radiated emissions, has worked on a study to establish a method to calculate the strength of radiated emissions from the railway system through numerical analysis. This paper outlines an improved railway antenna model and simulation support software which employs a numerical electromagnetic analysis software based on the Richmond Method of Moments.

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Method to Estimate Equivalent Natural Period with Micro-tremor Measurements

Munemasa TOKUNAGA, Masamichi SOGABE, Fumiaki UEHAN, Hiroyuki TANIMURA, ...

2012 Volume 53 Issue 1 Pages 21-27
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.21

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The object of this paper is to propose a method to estimate the equivalent natural period with micro-tremor measurements on the basis of the correlation between the natural frequency and the yield frequency. A method, combining the Eigensystem Realization Algorithm and some empirical hypotheses of vibration modes, was proposed for identifying the first natural vibration modes of structures. A ratio of the yield frequency to the natural frequency was mostly a certain constant value and the average value of the ratio depends on the type of structures. This paper proposes a simple procedure for estimating the yield frequency with micro-tremor measurements.

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Advanced Active Control of Contact Force between Pantograph and Catenary for High-Speed Trains

Yoshitaka YAMASHITA, Mitsuru IKEDA

2012 Volume 53 Issue 1 Pages 28-33
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.28

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This paper presents a method for suppressing the contact force fluctuation between pantograph and catenary for high-speed trains using pantographs equipped with two types of active control technology. One is PID active pantograph control, which utilizes the contact force as a feedback signal to the controller. The other is impedance control, which employs the frame displacement as a feedback signal. Impedance control outperforms PID control in terms of the reduction in contact force fluctuation due to lower noise contamination of the frame displacement signal compared with that of the contact force signal.

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Development of a Lateral Damper to Improve the Running Safety of Railway Vehicles during an Earthquake

Kohei IIDA, Mitsugi SUZUKI, Takefumi MIYAMOTO, Yukio NISHIYAMA, Daichi ...

2012 Volume 53 Issue 1 Pages 34-40
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.34

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This paper describes the development of a lateral damper designed to improve the running safety of railway vehicles during seismic activity. The developed damper was tested experimentally using a full-scale vehicle model consisting of one bogie and a half carbody on our own large shaking test facility. Results confirmed that the running safety of the vehicle equipped with the prototype damper was better protected against earthquakes than the vehicle equipped with a conventional damper. The performance of the prototype damper in providing better protection to Shinkansen vehicles under earthquake conditions was numerically verified. Finally, line tests carried out confirmed that the developed lateral damper behaved in the same way as a conventional damper under ordinary running conditions.

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Performance of Linear Motor Type Rail Brake Using Roller Rig Test Bench

Yasuaki SAKAMOTO, Takayuki KASHIWAGI, Hitoshi HASEGAWA, Takashi SASAKA ...

2012 Volume 53 Issue 1 Pages 41-45
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.41

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Studies have been carried out on a rail brake applying 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 no onboard supply is required by using dynamic braking. It is necessary however to install this brake 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 bench with a roller rig. These investigations revealed that the LIM-type rail brake could be applicable for practical use.

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Development of the On-board Maintenance Management System for Ground Coils of Maglev by Using RFID Technology

Minoru TANAKA, Noriyuki TAKAHASHI, Masao SUZUKI, Ryohei IKEDA, Sei NAG ...

2012 Volume 53 Issue 1 Pages 46-51
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.46

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In superconducting magnetic levitation (Maglev) transportation systems, a vast number of ground coils are installed along the entire length of the guideway which must withstand long periods exposed to outdoor environment. Periodical maintenance work is essential to secure Maglev system operational reliability. However, maintenance work is time and effort consuming given the vast number of ground coils all with similar appearances. Establishment of a reliable and convenient maintenance management system is important. A maintenance management system was therefore developed for ground coils utilizing a maintenance vehicle and radio frequency identification (RFID) technology.

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Examination of Vehicle Motion Characteristics of a Maglev Train Set Using a Reduced-scale Model Experiment Apparatus

Hironori HOSHINO, Erimitsu SUZUKI, Takenori YONEZU, Ken WATANABE

2012 Volume 53 Issue 1 Pages 52-58
Published: 2012
Released on J-STAGE: February 15, 2012

DOIhttps://doi.org/10.2219/rtriqr.53.52

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This paper focuses on the vehicle dynamics of superconducting magnetically levitated (Maglev) vehicles as a train set, and reports results of computer simulation as well as results of experiments using a reduced-scale Maglev model vehicle dynamics experiment apparatus (MAGMOX). The previously constructed MAGMOX consisting of a single car was expanded to form a train set comprising several cars. The computer simulations and MAGMOX experiments produced results that demonstrated their effectiveness in reproducing testing conditions of the full-scale Maglev system that are difficult to achieve on an actual full-scale vehicle due to vehicle structure constraints and rigging space.

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