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Vehicle, United States

Watanabe N.,Running Gear Laboratory | Stoten D.P.,University of Bristol
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2016

A rapid prototyping bogie (RPB) has multiple actuators to emulate missing bogie components. In the original RPB hybrid control system, deterioration in the control performance, which was caused by dynamic coupling between the multiple actuators, was observed during the RPB performance tests. To solve this issue, a new controller was developed, based upon the dynamically substructured systems (DSS) method, and trialled on an existing proof-of-concept test rig. Through random excitation tests, it was confirmed that the actuators were well controlled. As a consequence, the DSS approach was determined as a viable framework for future research into the RPB system. © 2016, Ken-yusha Inc. All rights reserved. Source


Koganei R.,Vehicle Noise and Vibration Laboratory | Watanabe N.,Running Gear Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

A 'Virtual Running Test Environment' has been in development, based on Hardware In the Loop Simulation (HILS) technology to emulate, in detail, railway vehicle motion on real tracks. The existing HILS system only reproduces the rigid body motion of a railway vehicle while running. In order to create a more realistic virtual running test environment, trials have been conducted to expand the frequency range of the HILS system to include and evaluate the elastic vibration of railway vehicle carbodies. This paper reports on frequency enhancement of the test equipment and about the construction of the numerical model including reproduction of elastic vibration. Source


Umehara Y.,Running Gear Laboratory | Ishiguri K.,Running Gear Laboratory | Yamanaga Y.,Running Gear Laboratory | Kamoshita S.,Vehicle Noise and Vibration Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

Bogie angle linked steering trucks have an excellent curving performance in circular curve sections. In order to gain even greater curving performance, a power-assisted steering system was developed for reducing wheel lateral forces in transition curve sections by generating the control force in the turning direction of the steering truck. In addition, a steering electro-hydraulic actuator was designed for reducing lateral forces in transition curve sections while preventing wrong direction steering operation which is the biggest problem with active steering systems. Finally, confirmation was obtained through running test on a test line that this steering actuator improved steering performance and maintained the fail-safe function. Source


Watanabe N.,Running Gear Laboratory | Morishita H.,Running Gear Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2012

In order to evaluate performance of a bogie more accurately in its planning stage, a rapid prototype bogie has been developed on which performance tests can be conducted on a rolling stock test plant without having to manufacture vital test components. The tests were executed by installing several actuators which were controlled to emulate the desired test dampers or rubber bushes. This paper describes the rapid prototype bogie and the results from actuator control tests on damper test equipment and from emulated running tests on the rolling stock test plant. Source


Kojima T.,Running Gear Laboratory | Sugahara Y.,Running Gear Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

This paper presents a technique for damper fault detection based on the phase difference between the bounce and pitch motions of bogie frames or a car body obtained with inertial sensors. This method avoids the need for mounting sensors in oil dampers. The result of vibration excitation tests with one vehicle on a testing plant demonstrated that the faults in a primary vertical damper were detectable by evaluating the phase difference between the bounce and pitch motions of the bogie frames. The results of running tests on a meter-gauge line demonstrated that secondary vertical damper faults were also detectable based on the phase difference between the bounce and pitch motions of the car body. Source

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