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Iida K.,Vehicle Mechanics Laboratory | Suzuki M.,Vehicle Mechanics Laboratory | Miyamoto T.,Vehicle Mechanics Laboratory | Nishiyama Y.,Research and Development Promotion Division | Nakajima D.,Vehicle Mechanics Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2012

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. Source


Miyauchi T.,Frictional Materials Laboratory | Tsujimura T.,Research and Development Promotion Division
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

The use of high-strength flame-resistant magnesium alloy appears to be a promising route to reduce the weight of car body shells. Since research and development of flame-resistant magnesium alloy has just started, basic data and processing technologies still need to be investigated. This paper presents the results of investigations on its test processing, evaluation of its mechanical properties and workability. The trial manufacturing of hollow extrudedmaterials and welding processes using this alloy are also briefly described. Source


Nakajima D.,Vehicle Mechanics Laboratory | Suzuki M.,Vehicle Mechanics Laboratory | Nishiyama Y.,Research and Development Promotion Division | Miyamoto T.,Vehicle Mechanics Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

A crushable lateral displacement stopper has been developed whose gap from the center pin expands only when it receives a strong impact in case of a major earthquake. As a coun-termeasure to improve the running safety of railway vehicles during earthquakes the stopper is used together with a specialized lateral damper. This paper describes the crushable stopper and results of static load tests and shaking tests on the large shaking test facility of RTRI with a full-scale vehicle model consisting of one bogie and half a carbody. Source


Aeaki K.,Meteorological Disaster Prevention Laboratory | Fukuhara T.,Meteorological Disaster Prevention Laboratory | Shimamura T.,Research and Development Promotion Division | Imai T.,Meteorological Disaster Prevention Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

The safety of railway line sections against strong winds can be improved by setting up anemometers in locations where wind speeds frequently exceed the critical wind speed of overturning. In order to ensure optimum location of the anemometers, wind speed values need to be estimated over an N-year return period along railway lines. This paper introduces a method to estimate over a given return period the values of the maximum instantaneous wind-velocity along railway lines at interval of 100m, by using two kinds of numerical simulation techniques (the meteorological model and the Computational Fluid Dynamics model) and a topographical factor analysis. Source


Yamada S.,Architecture Laboratory | Shimizu K.,Architecture Laboratory | Takei Y.,Research and Development Promotion Division
Quarterly Report of RTRI (Railway Technical Research Institute) (Japan) | Year: 2011

The study presented in this paper verifies the seismic retrofitting effects of reinforcing over-track buildings with knee-brace dampers. Firstly shaking table tests were carried out on large-scale test models, to simulate over-track buildings reinforced with knee-brace dampers. Resulting responses or hysteresis loops, confirmed the seismic retrofitting effects of knee-brace dampers. In addition, natural frequencies and damping factors of the models were estimated by ARX model. Furthermore, analytical study of over-track building models simulating true structures confirmed the seismic retrofitting effects of kneebrace dampers. Source

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