Structural Engineering and Mechanics

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Structural noise mitigation for viaduct box girder using acoustic modal contribution analysis

  • Liu, Linya (Engineering Research Center of Railway Environment Vibration and Noise Ministry of Education, East China Jiaotong University) ;
  • Qin, Jialiang (Engineering Research Center of Railway Environment Vibration and Noise Ministry of Education, East China Jiaotong University) ;
  • Zhou, Yun-Lai (Department of Civil and Environmental Engineering, National University of Singapore) ;
  • Xi, Rui (Engineering Research Center of Railway Environment Vibration and Noise Ministry of Education, East China Jiaotong University) ;
  • Peng, Siyuan (Engineering Research Center of Railway Environment Vibration and Noise Ministry of Education, East China Jiaotong University)
  • Received : 2018.10.31
  • Accepted : 2019.06.20
  • Published : 2019.11.25
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Abstract

In high-speed railway (HSR) system, the structure-borne noise inside viaduct at low frequency has been extensively investigated for its mitigation as a research hotspot owing to its harm to the nearby residents. This study proposed a novel acoustic optimization method for declining the structure-borne noise in viaduct-like structures by separating the acoustic contribution of each structural component in the measured acoustic field. The structural vibration and related acoustic sourcing, propagation, and radiation characteristics for the viaduct box girder under passing vehicle loading are studied by incorporating Finite Element Method (FEM) with Modal Acoustic Vector (MAV) analysis. Based on the Modal Acoustic Transfer Vector (MATV), the structural vibration mode that contributes maximum to the structure-borne noise shall be hereinafter filtered for the acoustic radiation. With vibration mode shapes, the locations of maximum amplitudes for being ribbed to mitigate the structure-borne noise are then obtained, and the structure-borne noise mitigation performance shall be eventually analyzed regarding to the ribbing conduction. The results demonstrate that the structural vibration and structure-borne noise of the viaduct box girder mainly occupy both in the range within 100 Hz, and the dominant frequency bands both are [31.5, 80] Hz. The peak frequency for the structure-borne noise of the viaduct box girder is mainly caused by $16^{th}$ and $62^{th}$ vibration modes; these two mode shapes mainly reflect the local vibration of the wing plate and top plate. By introducing web plate at the maximum amplitude of main mode shapes that contribute most to the acoustic modal contribution factors, the acoustic pressure peaks at the field-testing points are hereinafter obviously declined, this implies that the structure-borne noise mitigation performance is relatively promising for the viaduct.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China

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