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- Title
Acoustic radiation features and structural-acoustic sensitivity of channel beam.
- Authors
Jinbo Song; Rui Song; Zhi Xiong
- Abstract
This paper aims to disclose the effects of structural parameters on the structural noise of channel beam. To this end, a finite-element model of rail transit channel beam was established based on vehicle-track coupling dynamics, and the vibration response of the channel beam was computed under the load of train. Then, the noise features of the rail transit channel beam were analyzed by indirect boundary element method, and the structuralacoustic sensitivity of the channel beam was calculated by finite-difference method. After that, the author discussed how the bottom plate thickness, web thickness and flange plate thickness of the channel beam affect the linear sound pressure level at different frequencies and different points of the acoustic field. The results show that the peak noise frequency of the rail transit channel beam fell in the range of 31.5~80Hz. The thickening of the bottom plate helps to control the structural noise in a small near-bridge area but cannot reduce the noise at farfield points. The thickening of the web will increase the peak sound pressure level at nearfield points and reduce the noise at far-field points. The bottom plate thickness and web thickness have a small impact on the sound pressure of the field points, so does the effect of flange plate thickness on the structural noise of the channel beam. The research findings provide a reference for noise reduction of bridge structures and the optimization of bridge design.
- Subjects
BOUNDARY element methods; SOUND pressure; STRUCTURAL acoustics
- Publication
Traitement du Signal, 2018, Vol 35, Issue 1, p35
- ISSN
0765-0019
- Publication type
Article
- DOI
10.3166/TS.35.35-45