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<p>With the rapid development of rail transit, research on vibration reduction and isolation had become a hotspot issue in rail transit operation and maintenance. Among them, low-frequency vibration reduction (LFVR) is a difficult problem in rail transit vibration reduction technology. Firstly, this paper proposes a phononic-like crystal (PLC) model based on locally resonant theory, and establishes a phononic-like crystal polymer concrete (PLCPC) track bed structure model on this basis. Secondly, the bandgap (BG) frequency range, frequency response function and vibration reduction BG mechanism of the PLCPC track bed structure are calculated and analyzed. Then, the BG regulation of the PLCPC is studied and analyzed in detail. Finally, based on the PLCPC track bed structure model, a novel PLCPC track bed is developed to attenuate and control low-frequency vibration generated during subway operation. The develops PLCPC track bed is applied to the north extension line engineering of Nanjing metro line 1 in Nanjing of China. The principle of regulating the vibration reduction characteristics of the PLCPC composite material is to enhance the strength of locally resonant, which can achieve low frequency wide BG. The field test results shows that the PLCPC track bed has good LFVR performance in subway operation, and opening the LFVR BG. The vertical vibration attenuation range is 1–250&#xa0;Hz, and the maximum insertion loss of one-third octave for vertical of the tunnel wall is 13.17 dB, and the maximum vertical Z-vibration level difference of the tunnel wall within the range of 1–80&#xa0;Hz is 6.47 dB. The PLCPC track bed not only achieves LFVR, but also has advantages such as low construction cost and environmental protection, which can provide theoretical and technical support for the engineering applications of polymer concrete track bed.</p>

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Vibration reduction bandgap characteristics of novel phononic-like crystal structure

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Peng Xiao,
  • Linchang Miao,
  • Haizhong Zheng,
  • Benben Zhang,
  • Lijian Lei,
  • Jing Zhang,
  • Tianshuang Geng

摘要

With the rapid development of rail transit, research on vibration reduction and isolation had become a hotspot issue in rail transit operation and maintenance. Among them, low-frequency vibration reduction (LFVR) is a difficult problem in rail transit vibration reduction technology. Firstly, this paper proposes a phononic-like crystal (PLC) model based on locally resonant theory, and establishes a phononic-like crystal polymer concrete (PLCPC) track bed structure model on this basis. Secondly, the bandgap (BG) frequency range, frequency response function and vibration reduction BG mechanism of the PLCPC track bed structure are calculated and analyzed. Then, the BG regulation of the PLCPC is studied and analyzed in detail. Finally, based on the PLCPC track bed structure model, a novel PLCPC track bed is developed to attenuate and control low-frequency vibration generated during subway operation. The develops PLCPC track bed is applied to the north extension line engineering of Nanjing metro line 1 in Nanjing of China. The principle of regulating the vibration reduction characteristics of the PLCPC composite material is to enhance the strength of locally resonant, which can achieve low frequency wide BG. The field test results shows that the PLCPC track bed has good LFVR performance in subway operation, and opening the LFVR BG. The vertical vibration attenuation range is 1–250 Hz, and the maximum insertion loss of one-third octave for vertical of the tunnel wall is 13.17 dB, and the maximum vertical Z-vibration level difference of the tunnel wall within the range of 1–80 Hz is 6.47 dB. The PLCPC track bed not only achieves LFVR, but also has advantages such as low construction cost and environmental protection, which can provide theoretical and technical support for the engineering applications of polymer concrete track bed.