Research to suppress flexural vibration of car bodies
Recent railway vehicles are being made lighter in weight and simplified structurally. This contributes speedup, reduction of environmental vibration, saving energy and costs, etc. On the other hand, there are cases in which flexural vibration of car bodies becomes conspicuous, mainly due to decreases in their structural rigidity and damping. Since such vibration often occurs in the high sensitivity frequency region for human, suppression of the flexural vibration is important to improve riding comfort.
It has long been believed that the flexural vibration of car bodies is similar to the bending vibration of simple elastic beams. From the results of latest measurement tests and detailed study, however, it is found that recent lightweight car bodies have complicated vibration shapes, with the roof and floor moving out of phase.
A series of studies are carried out as follows to propose design guidelines for achieving lightweight and structurally simplified car body without increasing flexural vibration.
Stationary vibration test |
Running test |
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Study of vibration suppression measures |
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Application in actual vehicles |
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