Keywords: vibration control, flexural vibration, carbody, active mass damper.

Recent light-weighted and structurally simplified railway vehicle carbodies tend to have complicated three-dimensional flexural vibration modes, according to the vibration measurement test results. In particular, plural flexural vibration modes having natural frequencies around 10Hz are known to have a major impact on ride quality. Therefore these vibration modes need to be reduced to improve ride quality. In order to reduce vibration corresponding to these modes, the authors proposed a multimodal vibration control method using two active mass dampers (AMDs), and the feasibility of the proposed method was confirmed. In this paper, numerical studies were firstly carried out to develop a more practical AMD system, then compact AMDs were designed based on the calculation results. As a next step, the excitation tests using Shinkansen-type test vehicle at the rolling stock testing plant at Railway Technical Research Institute (RTRI) were conducted to confirm the ability of the compact AMDs. As a result, it was shown that the vibrations corresponding to the two target modes were reduced. Finally, running tests on the actual track using an actual Shinkansen vehicle were carried out, and the vibration control effect using the compact AMDs has been obtained on actual running state.

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