Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The Vibration Attenuation Properties of Locally Resonant Track Bed for Subway Engineering
Due to the high speed, large capacity, safety and reliability of subway traffic, it is of great significance to alleviate urban congestion. However, the ensuing vibration problem has caused a major adverse impact on building safety, precision instrument operation and human health. Although there are many kinds of vibration reduction measures, it is difficult to attenuate low frequency vibration and achieve satisfactory results between vibration attenuation effect and cost control. Based on the locally resonant phononic crystal theory, this paper proposes three-component locally resonant track bed (LRTB) and investigates the effects of geometrical parameters on the band gap features in detail. The band structures are calculated using improved plane wave expansion (IPWE) to determine the frequency attenuation range, and the transmission spectra are obtained by finite element method (FEM) to represent the attenuation efficiency. The results indicate LRTB designed based on locally resonant theory is able to give low frequency band gap to cover the main frequency of subway environment, and the band gap can be regulated by properly configurating the geometrical parameters to actualize low frequency broadband attenuation. With the increasing of the primitive cell number, the band gap attenuation efficiency continues to improve and eventually remain stable. To facilitate the application, the detailed flow chart of LRTB is proposed for actual engineering vibration environment. The investigations can provide inspiration for the design of subway vibration isolation structure.
The Vibration Attenuation Properties of Locally Resonant Track Bed for Subway Engineering
Due to the high speed, large capacity, safety and reliability of subway traffic, it is of great significance to alleviate urban congestion. However, the ensuing vibration problem has caused a major adverse impact on building safety, precision instrument operation and human health. Although there are many kinds of vibration reduction measures, it is difficult to attenuate low frequency vibration and achieve satisfactory results between vibration attenuation effect and cost control. Based on the locally resonant phononic crystal theory, this paper proposes three-component locally resonant track bed (LRTB) and investigates the effects of geometrical parameters on the band gap features in detail. The band structures are calculated using improved plane wave expansion (IPWE) to determine the frequency attenuation range, and the transmission spectra are obtained by finite element method (FEM) to represent the attenuation efficiency. The results indicate LRTB designed based on locally resonant theory is able to give low frequency band gap to cover the main frequency of subway environment, and the band gap can be regulated by properly configurating the geometrical parameters to actualize low frequency broadband attenuation. With the increasing of the primitive cell number, the band gap attenuation efficiency continues to improve and eventually remain stable. To facilitate the application, the detailed flow chart of LRTB is proposed for actual engineering vibration environment. The investigations can provide inspiration for the design of subway vibration isolation structure.
The Vibration Attenuation Properties of Locally Resonant Track Bed for Subway Engineering
Lecture Notes in Civil Engineering
Kang, Thomas (Herausgeber:in) / Lee, Youngjin (Herausgeber:in) / Lei, Lijian (Autor:in) / Miao, Linchang (Autor:in) / Li, Chao (Autor:in) / Wang, Junjie (Autor:in) / Zhang, Maolin (Autor:in)
31.01.2022
15 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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