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Your search keyword '"Kamada, Takayoshi"' showing total 155 results
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155 results on '"Kamada, Takayoshi"'

1. Active vertical vibration suppression of high-speed railway vehicles by controlling internal pressure of the air spring using μ-synthesis control.

Author

Kamada, Takayoshi and Karaki, Tsubasa

Subjects
*HIGH speed trains, *RAILROAD trains, *AIR pressure, *AIR suspension for automobiles, *PRESSURE control, *INTERNAL auditing, *RUNNING speed
Abstract

In recent years, railway vehicles have become lighter since it corresponds not only to the improvement of the running speed but also to the reduction of running cost and environmental noise. On the other hand, this causes an increase in the vertical elastic vibration of the car body and the riding comfort has deteriorated. Therefore, various strategies to reduce vertical vibration have been studied. In this study, vertical vibration reduction, by controlling the internal pressure of the air spring using µ-synthesis control, is proposed. The merit of µ-synthesis control is that it can guarantee robust performance. A controller by µ-synthesis was designed for vibration reduction of a 1/6 scale railway model and compared nominal performance and robust performance with H∞ control theory. Moreover, a feasibility study of this strategy was investigated for full-scale railway vehicles through simulation. [ABSTRACT FROM AUTHOR]

Published
2024
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15. A three-dimensional analytical model and parameter determination method of the elastic vibration of a railway vehicle carbody.

Author

Akiyama, Yuki, Tomioka, Takahiro, Takigami, Tadao, Aida, Ken-ichiro, and Kamada, Takayoshi

Subjects
RAILROAD trains, THREE-dimensional modeling, DEGREES of freedom
Abstract

Reducing railway vehicles' three-dimensional (3D) elastic vibration is needed to improve passenger comfort. This paper presents a 3D analytical model and parameter determination method for the elastic vibration of a carbody. The carbody is modelled as a simple box-type structure consisting of an anisotropic 3D elastic body treated as a continuous system. This model can express complicated 3D elastic vibration (such as lateral–vertical coupled vibration) with fewer degrees of freedom and at a lower computational cost than the detailed finite element model. A model parameter determination method using particle swarm optimisation was also proposed. Application to a Shinkansen-type test vehicle showed good agreement between measured and calculated results with a maximum natural frequency differences of the targeted six elastic vibration modes within 0.86%, indicating the effectiveness of the proposed model and parameter determination method. [ABSTRACT FROM AUTHOR]

Published
2020
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