著者

Yasushi UJITA Kohji FUNATSU Yasufumi SUZUKI

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.44, no.1, pp.28-33, 2003 (Released:2006-09-13)

参考文献数

6

被引用文献数

6 7

---

Serious railway accidents in recent years in Japan were surveyed in order to clarify the target of railway crashworthiness. From the result, it was found that level crossing collision accidents were one of the most important targets of the crashworthiness of railway carriages. Both numerical simulations and empirical method to analyze crushing behaviour of railway carriages in Japan were applied in this research work. As the empirical methods, quasi-static compression tests for carbody sections were used to understand crushing behaviour of the carbody. Using the crushing characteristics obtained from the test, one-dimensional lumped mass numerical model was built and calculated to evaluate impacting behaviour of the trains at collision accidents. Three-dimensional FE analysis and real size train crash test were also included in this research program. The results of both numerical method and experimental tests were compared.

著者

Takayasu KITANO Yuki OTA Shigeru TANIGUCHI Koji IWATA Shota SAIKI Masayuki KITORA Akira ASANO

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.61, no.2, pp.114-119, 2020-05-01 (Released:2020-05-30)

参考文献数

6

---

An on-board train positioning and train integrity system combining inertial sensors and tachometer generators has been developed to detect train position and presence in a section using a radio train control system. In this system, curves and slopes which are registered as distinctive points on the track in an on-board database are used to detect train position and calculate train length. Additionally, train splitting can also be detected by the difference in acceleration between the head vehicle and the tail vehicle. Running tests using fail-safe processors equipped with these functions have demonstrated the feasibility of this system.

著者

Kikuo TAKAO Ken-ichi URUGA

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.44, no.3, pp.103-108, 2003 (Released:2006-07-20)

被引用文献数

1 3

---

We have been developing a variable gauge system for through-operation between standard-gauge Shinkansen and narrow-gauge conventional sections since 1994. A Gauge Change Train (GCT), an experimental 3-motor-car electric multiple unit (EMU), was completed for test purposes in autumn 1998 to verify the basic efficiency of this system. It has been designed to run at a maximum speed of over 300 km/h on Shinkansen and 130 km/h on conventional lines under a catenary voltage of 20 kV, 25 kV (50/60 Hz) AC and 1.5 kV DC. It had already been for a year's high-speed endurance evaluation at the Transportation Technology Center in Pueblo, U.S.A. from spring 1999 before being subjected to highspeed and curving performance trials on JR Kyushu and JR Shikoku narrow-gauge lines and gauge change performance and AC-DC section running tests with JR West from 2001 to 2003. We verified running stability at 130km/h on narrow gauge lines and will implement a high-speed performance test on Shinkansen lines in the near future.

著者

Yoshitaka MURONO

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.56, no.4, pp.245-249, 2015-11-01 (Released:2016-01-07)

参考文献数

5

---

The Railway Technical Research Institute opened the Center for Railway Earthquake Engineering Research on April 1, 2014 amid increasing concern about the risk of seismic disasters caused in particular by massive earthquakes. Violent earthquake disasters are becoming more common and more complex. In order to achieve safer railway systems able to cope with these conditions, the center was established as a unique "base" for railway-seismic technology in Japan. The center also integrates RTRI's research resources on quake-motion, seismic design and countermeasure, and early warning. This report introduces the role of CREER and recent research into earthquake-related technology.

著者

Kunihiro KAWASAKI

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.61, no.2, pp.82-85, 2020-05-01 (Released:2020-05-30)

参考文献数

3

---

Following recent developments in information and communication technology (ICT), various research and development projects are ongoing around the world to propose new train control technology for safer and more stable transportation services. In particular, 5th generation mobile communication network systems (5G) which will be partially available in 2019 are expected to be used for critical roles in various safety related systems in the future, such as for automatic driving systems for road vehicles and train control systems. This paper outlines recent trends in basic studies for utilizing various communication network techniques including content centric network techniques and 5G systems to sophisticate signalling systems and train control systems. This paper also introduces a future plan for the challenges of the developing autonomous train operation and control system to realize safer, more stable and low-cost train operation services.

著者

Masahiro KORENAGA Shunroku YAMAMOTO Shunta NODA Shin AOI

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.60, no.2, pp.134-139, 2019-05-01 (Released:2019-05-26)

参考文献数

9

被引用文献数

4

---

This article explains processes for improving the railway earthquake early warning system. These processes were introduced to use data transmitted in real time from recently developed ocean bottom seismic networks. Three mechanisms were designed to be able to exploit this data: 1) an algorithm for servers in OBS system base stations; 2) a procedure to allow transmissions between the servers and railway company receivers; and 3) a system built into the receiver to determine whether running trains need to be stopped or not. Confirmation was obtained that the proposed processes were able to reduce the risks to railways from earthquakes, because they are capable of extending the lead time before the arrival of strong seismic motion.

著者

Tomoki WATANABE

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.41, no.1, pp.5-10, 2000 (Released:2007-10-03)

被引用文献数

1 2

---

Inverters have made a great progress due to the development of power semiconductors. Smaller power convertors offer larger passenger rooms and higher productivity. Convertors on-board can be much smaller if we utilize 3.3 kV or 4.5 kV IGBTs and two-level convertors instead of three-level ones. Smaller loss and smaller harmonics are always expected for convertors to enable self-cooling and avoid additional measures for EMC requirements.If 10-40 kV power semiconductors are available, it may be possible to realize transformerless railway vehicles for the 25 kV ac system by assigning convertors with the role of the main transformer in the traction circuit.

著者

Tomohiro OKINO Keisuke NAGATA Kazuma NAKAI Hidetoshi KOBAYASHI

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.62, no.3, pp.185-190, 2021-08-01 (Released:2021-08-26)

参考文献数

3

被引用文献数

1

---

While standards for crashworthiness of railway vehicles have been defined in Europe and the U.S., there is no standard in Japan. Therefore, it is important to establish an evaluation method for crashworthiness of railway vehicles in Japan. The authors carried out finite element analyses under various conditions based on the statistical analysis of serious level-crossing accidents. We evaluated the mean decelerations (conforming to European standard), the maximum decelerations (U.S. standard) and integrated values of the deceleration, which are obtained from impact deceleration waveforms in the passenger area. We also performed finite element analyses of dummy's behavior and injury values using these deceleration waveforms as input. We examined the correlation between these evaluation results and dummy's injury values. As a result, we confirmed that the integrated values of the deceleration of the passenger area had the highest correlation with the dummy's injury values.

著者

Tomoyuki OGAWA Shinichi MANABE Gaku YOSHIKAWA Yoichi IMAMURA Masahisa KAGEYAMA

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.58, no.1, pp.21-27, 2017-02-01 (Released:2017-03-09)

参考文献数

2

被引用文献数

2 6

---

Running resistance is one of the important factors in the design of train performance and the planning of speed profiles. Running resistance is also an important factor in the analysis of energy consumption, because it is the main source of energy consumption. This paper proposes a method for calculating running resistance under various conditions by using commercial running data obtained through a train data collection device instead of running tests. This paper describes how the proposed method was verified through running tests, and presents running resistance under various conditions calculated using the proposed method.

著者

Katsutoshi ANDO Makoto SUNAGA Hifumi AOKI Osamu HAGA

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.42, no.1, pp.35-41, 2001 (Released:2007-08-22)

参考文献数

5

被引用文献数

29 56

---

Thirty years have passed since the world's first use of slab tracks by the former Japanese National Railways. It is recognized that they have excellent performance for maintaining good track geometries and reduce track maintenance costs through this experience. However, there were still some points to be improved. This paper describes the present condition of slab tracks, development of a new structure on earthworks and reduction of construction costs for the Hokuriku Shinkansen line.

著者

Kazuhide YASHIRO Yoshiyuki KOJIMA Mitsuru SHIMIZU

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.48, no.3, pp.136-141, 2007 (Released:2007-10-16)

参考文献数

1

被引用文献数

21 96

---

Since mountain tunnels are generally surrounded by stable ground, their displacement during seismic activity tends to be minimized, making such structures less susceptible to seismic damage. Despite this, many railway mountain tunnels have sustained damage, from the 1923 Kanto Earthquake to the 2004 Niigataken-Chuetsu Earthquake. This paper provides an outline of the historical damage to mountain tunnels in Japan and outlines the results of case studies on damage sustained in mountain tunnels. Also outlined here is a classification of the damage patterns and the conditions of damage based on the results of the case studies, and we refer to the estimated causes of damage to tunnels in the 2004 Niigataken-Chuetsu-Earthquake.

著者

Yoko TAKEUCHI Norio TOMII Chikara HIRAI

出版者

公益財団法人 鉄道総合技術研究所

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.48, no.4, pp.197-201, 2007 (Released:2007-12-10)

参考文献数

8

被引用文献数

3 18 9

---

The aim of this study is to examine the qualitative and quantitative characteristics that robust train schedules should have. The method we propose to evaluate the robustness of train schedules has two main characteristics; one is a focus on passenger disutility, and the other involves the development of a probabilistic model for the statistical evaluation of train operations. To calculate the robustness indices, we applied a Monte Carlo simulation method that performs iterative train-passenger simulations. We then carried out simulation experiments using actual data to calculate the robustness indices for two train schedules, and compared the results.

著者

Tadao TAKIGAMI Takahiro TOMIOKA

出版者

公益財団法人 鉄道総合技術研究所

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.46, no.4, pp.225-230, 2005 (Released:2006-02-23)

参考文献数

10

被引用文献数

3 13

---

The goal of this study is to reduce the bending vibration of railway vehicles by applying a vibration suppression technique that utilizes piezoelectric elements electrically shunted by an external circuit. This paper presents an investigation that uses a scale model of a Shinkansen vehicle about 5m long. Small pieces of piezoelectric elements are bonded to its floor structure and electrically connected to a shunt circuit featuring a design based on a newly proposed method. The results of excitation tests show that the bending vibration of the carbody can be reduced successfully.

著者

Katsutoshi MIZUNO Masafumi OGATA Ken NAGASHIMA

出版者

公益財団法人 鉄道総合技術研究所

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.54, no.1, pp.46-51, 2013-02-01 (Released:2013-03-06)

参考文献数

5

被引用文献数

4 7

---

YBCO coated conductors attract attention because of their high critical current in high magnetic field conditions, hence calling for a suitable coil fabrication method. One of the critical problems associated with this process, however, is the negative impact on YBCO coil performance due to epoxy impregnation. Epoxy impregnation is an important technique to increase the mechanical strength and thermal conductivity of superconducting coils. However, the bonding strength of epoxy resin is stronger than the delamination strength of YBCO coated conductors in a certain direction. Therefore, thermal stress could damage epoxy impregnated YBCO coils. As a new impregnation material, we have focused on cyanoacrylate resin.

著者

Mitsuru IKEDA Takeshi MITSUMOJI

出版者

公益財団法人 鉄道総合技術研究所

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.49, no.3, pp.184-190, 2008 (Released:2008-09-08)

参考文献数

6

被引用文献数

3 18

---

The reduction of aeroacoustic noise generated by pantographs has been an important subject of discussion in increasing the speed of Shinkansen trains. As the panhead significantly influences the aeroacoustic characteristics of the pantograph, reduction of its aeroacoustic noise is strongly demanded. This paper describes a method of evaluating the contributions of low-frequency aeroacoustic noise sources around the panhead. Visualization of these contributions can indicate the structure of such noise sources.

著者

Yoshitaka MURONO Koichi GOTO

出版者

Railway Technical Research Institute

雑誌

Quarterly Report of RTRI (ISSN:00339008)

巻号頁・発行日

vol.52, no.4, pp.193-198, 2011 (Released:2011-11-17)

参考文献数

2

---

A great earthquake of magnitude M9.0, occurred around 14:46 pm on March 11, 2011, at an epicenter at an undersea depth of 24 km off the Sanriku coast line, an area in the northeastern part of the main island of Japan. The earthquake was named as "2011 off the Pacific Coast of Tohoku Earthquake." A large-scale fault slide occurred at the plate boundary stretching from the offshore area of Iwate to Ibaraki, and caused heavy tremors of level 7 Japanese Seismic Intensity at Kurihara City in Miyagi Prefecture, and of level 6+ in wider areas in Miyagi, Fukushima, Ibaraki and Tochigi prefectures. This article outlines the outline of the earthquake, and gives an overview of RTRI activities to support the recovery of railway networks damaged by the earthquake. The comparisons of the actual shaking waves of this earthquake with design waves in the Design Standards for Railway Structures: Volume of Seismic Design is also described.