Research on the design and application of low-frequency vibration and noise reduction of railroad metamaterial wave-resistant pads
This study addressed the challenges posed by low-frequency vibration and noise in urban rail transit systems,which have adverse effects on line equipment,surrounding structures,and human well-being.In response to these issues,the research focused on the development of a novel metamaterial wave resistor pad utilizing local resonance mechanism technology.The pad,constructed with a periodic arrangement of steel sheet nested rubber structures,aimed to enhance overall structural elastic wave attenuation and improve vibration damping efficiency.The study began by deriving the bandgap calculation formula and discussing the impact of geometric parameters on bandgap generation.Additionally,it employed frequency domain dynamics and boundary element methods to analyze indoor vibration and secondary noise distribution in adjacent buildings.Results demonstrate the effectiveness of the metamaterial wave-resistive pad in controlling vibration and secondary noise within the bandgap frequency range,achieving up to 20 dB vibration attenuation.Notably,within the optimal frequency range of 17～28 Hz,the pad exhibits significant noise reduction,with a maximum average sound pressure level reduction of 25 dB across all floors.Overall,the study underscored the effectiveness of the metamaterial wave-resistant pad in mitigating low-frequency vibration and noise induced by subway trains,offering valuable insights for real-world applications in subway vibration and noise reduction projects.
metamaterial wave-resistive padsmetacellsbandgapslocalized resonancevibration and noise reduction
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维普
