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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


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


Doi H.,Vehicle Mechanics Laboratory | Miyamoto T.,Vehicle Mechanics Laboratory | Suzumura J.,Lubricating Materials Laboratory | Nakahashi J.,Vehicle Dynamics Laboratory | And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2012

A number of flange climb derailments have occurred in sharp curves or curves with turnouts within relatively short accumulated running distances subsequent to wheel turning. This indicates that a change in the condition of the turned wheel surface might be a factor inducing flange climbing. Through several experiments and numerical simulations, the authors investigated the relationship between the running safety of a vehicle and its wheel surface condition especially in terms of wheel/rail friction. Furthermore, lubrication just after wheel turning was proposed as a countermeasure to flange climb derailments and its effectiveness and persistence were evaluated. Source


Kuzuta M.,Vehicle Mechanics Laboratory | Ueki K.,Research and Development Promotion Division | Miyamoto T.,Vehicle Mechanics Laboratory | Nishiyama Y.,Research and Development Promotion Division | Maebashi E.,Vehicle Mechanics Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

The dynamic motion of a train set will be affected by the change in running resistance as the wheels run over sleepers or ballast. It is therefore important to determine the motion of vehicles in such situations both experimentally and theoretically. A 1 to 10 scale model vehicle was used to perform running tests during which the vehicle was made to collide against model iron sleepers. Further running tests were carried out involving a real single bogie falling onto ballast or a concrete sleeper. These experiments were used as a basis to develop a numerical simulation program, capable of calculating the dynamic motion of a train after its derailment, and computed dynamic behavior of 5 cars after their derailment. Source

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