Vibration reduction of a high-speed train floor using multiple dynamic vibration absorbers

Abstract

Due to local resonances, high vibration levels of the floor occur frequently in high-speed trains, which have a great negative impact on the ride comfort. A method is presented to control excessive local vibration of the internal floor of a high-speed electric multiple unit train by using multiple dynamic vibration absorbers (DVAs). The possible causes of the high vibration levels of the internal floor are investigated using operational and modal tests. To reduce the vibration, a model of the vehicle body with multiple DVAs is established based on the modal superposition method. The contribution of different modes at the dominant vibration peaks is assessed and targeted. It is found that a strong peak at around 12 Hz is dominated by a single mode, which can be attenuated by using a single DVA, which can be applied outside the car body, such as under-frame equipment. In the frequency region between 30 and 35 Hz several local modes contribute, and can be controlled by using multiple DVAs. Methods are studied to determine the optimal parameters for these DVAs, including location, natural frequency and mass. For a single DVA conventional fixed-point theory is used, whereas for multiple absorbers an optimization method is proposed. Finally, the effect of applying DVA solution is verified in the full vehicle model using frequency responses analysis. The results indicate that the proposed method can effectively reduce the vibration of targeted modes and improve the ride quality considerably in terms of the vertical motion.

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ORCID for David Thompson: orcid.org/0000-0002-7964-5906

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