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Structure-borne noise characteristics of fully-enclosed sound barriers on high-speed railway bridges(PDF)


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Structure-borne noise characteristics of fully-enclosed sound barriers on high-speed railway bridges
ZHENG Jing12 LI Xiao-zhen1 BI Ran1 ZHANG Xiao-bang1 HE Hao-nan1 HU Zhe3
(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. School of Architecture and Civil Engineering, West Anhui University, Lu'an 237001, Anhui, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China)
high-speed railway bridge engineering noise reduction noise test fast multipole boundary element method fully-enclosed sound barrier structure-borne noise
A test was conducted on the vibration and noise of typical structural cross-sections of high-speed railway bridges and bridge-fully-enclosed sound barriers. A numerical model was established based on the fast multipole boundary element method(FMBEM)for predicting the structure-borne noise of an high-speed railway bridge-fully-enclosed sound barrier system. The time-frequency characteristics of train-induced vibration and the structure-borne noise radiation of component plates and their correlations were analyzed in detail, and the accuracy of FMBEM numerical prediction model for calculating the structure-borne noise was verified. The spatial and frequency domain distribution characteristics of structure-borne noise of a 32 m simply supported box girder bridge with and without fully-enclosed sound barriers were compared and analyzed, and the calculation efficiencies of FMBEM and boundary element method(BEM)were compared. Analysis results indicate that the spectral distribution of component plate vibrations of the bridge-fully-enclosed sound barrier system is consistent with that of the structure-borne noise. Influenced by the sound insulation effect of fully-enclosed sound barriers and the shielding effect of girders, the noise signals measured at 0.3 m from the bottom plate of the box girder reflect the structure-borne noise characteristics of bottom plate. Additionally, other measurement points are influenced to varying degrees by the noise radiated from other component plates or the wheel-rail system. The amplitude-frequency characteristics of the simulated and measured noise are consistent with each other, and the simulation error of peak value is within 1.5 dB. The installation of fully-enclosed sound barriers reduces the vibration and structure-borne noise of bridge plates, and alters the distribution characteristics of sound field around the bridge. The overall sound pressure level of field points on the bridge plate surfaces decreases by 0.8 dB, whereas those under the girder and diagonally above the girder increase by 4.1-9.4 dB and 9.6-18.1 dB, respectively. The structure-borne noise at certain points above the bridge-fully-enclosed sound barrier system is approximately 12.4 dB greater than that of the bridge without sound barriers. Furthermore, the calculation time of FMBEM is 1/3 that of the traditional BEM, indicating the improved efficiency of FMBEM. 3 tabs, 16 figs, 30 refs.


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Last Update: 2021-07-20