声子晶体型浮置板轨道低频减振性能研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (12) : 36-42.

论文

声子晶体型浮置板轨道低频减振性能研究

盛曦，曾会柯，石灿，杜彦良

作者信息 +

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

SHENG Xi，ZENG Huike，SHI Can，DU Yanliang

Author information +

文章历史 +

摘要

地铁列车运行诱发的低频环境振动会对人体、精密仪器和建筑物产生不利影响，引起了人们的普遍重视。基于声子晶体理论，在钢弹簧浮置板轨道(floating slab track，FST)结构基础上，提出了一种声子晶体型浮置板轨道结构，通过引入弹性波带隙提升其低频减振性能。建立了周期半轨道模型，采用谱元法对其进行求解，揭示了声子晶体型浮置板轨道的能带结构与带隙特性；建立了有限半轨道模型，采用谱元法计算分析了不同轨道部件的位移导纳幅值，传递率与基础插入损失。结果表明：基础、浮置板和钢轨位移导纳幅值在低频带隙范围内的峰值显著降低，相比于钢弹簧浮置板轨道，声子晶体型浮置板轨道不仅低频减振性能得以提升，其轨道结构振动响应也有所减弱。

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.

导出引用

盛曦，曾会柯，石灿，杜彦良. 声子晶体型浮置板轨道低频减振性能研究[J]. 振动与冲击, 2022, 41(12): 36-42

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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