A study on low-frequency vibration-mitigation performance of a phononic crystal floating slab track

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (12) : 36-42.

SHENG Xi，ZENG Huike，SHI Can，DU Yanliang

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Abstract

Low-frequency ground-borne vibrations induced by subway trains can have adverse impacts on humans, precision instruments and buildings, causing universal attentions. Using the phononic crystal theory, this paper proposes a novel phononic crystal floating slab track (FST) structure based on the steel-spring FST. The low-frequency vibration-mitigation performance can be improved by the introduction of the elastic wave band gap behaviors. The periodic half-track model for the calculation of the band gap is established and then solved by the spectral element method. The band structure and the band gap characteristics of the phononic crystal FST are revealed. Subsequently, the receptance amplitudes of the track components, the transmissibility and the insertion loss of the infrastructure are calculated with the finite half-track model which is also solved by the spectral element method. The results show that the peak values of receptance amplitudes of the infrastructure, the floating slab and the rail are notably decreased within the low-frequency band gap range. Compared to the steel-spring FST, the phononic crystal FST realizes the improvement of the low-frequency vibration-mitigation performance as well as the attenuation of the vibration response of the track structure.

Key words

phononic crystal / band gap characteristic / spectral element method / low-frequency vibration mitigation

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SHENG Xi，ZENG Huike，SHI Can，DU Yanliang. A study on low-frequency vibration-mitigation performance of a phononic crystal floating slab track[J]. Journal of Vibration and Shock, 2022, 41(12): 36-42

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