A study on noise reduction performance of low-height curved noise barriers on rail transit bridges

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (24) : 143-151.

SONG Lizhong1,2,3，GAO Kui1，FENG Qingsong2，LIU Quanmin3，LUO Xinwei4，LI Xiaozhen5

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Abstract

The low-height curved noise barriers installed on an urban rail transit viaduct were taken as the research object. The sections with and without noise barriers were selected, respectively, to carry out the noise test when the train passes. A total noise prediction model of rail transit viaduct was established by using the finite element method, boundary element method and statistical energy analysis, and was then verified by the test. Based on the test and prediction results, the noise spatial distribution of the elevated urban rail transit was studied, the noise reduction characteristics of the low-height curved noise barrier were analyzed, and the influence of low-height curved noise barrier on the noise distribution beside the bridge was discussed. The results show that the measuring points below the rail surface are mainly influenced by low frequency bridge-borne noise. The noise below the rail surface decrease slowly with distance, which decrease about 2.44 dB(A) when the distance doubled in the section without noise barrier. The measuring points above the rail surface are mainly influenced by high frequency wheel-rail noise. The noise above the rail surface decrease rapidly with distance, which decrease about 5.68 dB(A) when the distance doubled in the section without noise barrier. The low-height curved noise barrier has a good noise reduction effect on the middle and high frequency noise, but increases low frequency noise, which may be caused by the secondary structure-borne noise radiation of the noise barrier. The insertion losses of low-height curved noise barrier are about 5~8 dB(A) and 2~6 dB(A) at 7.5 m and 25 m from the center of the rail line, respectively. The insertion loss of low-height curved noise barrier is about 4~6 dB(A) beside the bridge. Due to the secondary structure-borne noise radiated from the low-height curved noise barrier, the noise increases in local areas of the bridge mid-span section.

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elevated rail transit / low-height curved noise barrier / insertion loss / in-site measurement / attenuation characteristics

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SONG Lizhong1,2,3，GAO Kui1，FENG Qingsong2，LIU Quanmin3，LUO Xinwei4，LI Xiaozhen5. A study on noise reduction performance of low-height curved noise barriers on rail transit bridges[J]. Journal of Vibration and Shock, 2023, 42(24): 143-151

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