Characteristics and energies in different frequency bands of environmental noise in urban elevated rail

LI Li; YIN Tie-feng; ZHU Qian; LUO Yan-yun

doi:10.19818/j.cnki.1671-1637.2018.02.013

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LI Li, YIN Tie-feng, ZHU Qian, LUO Yan-yun. Characteristics and energies in different frequency bands of environmental noise in urban elevated rail[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 120-128. doi: 10.19818/j.cnki.1671-1637.2018.02.013

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LI Li, YIN Tie-feng, ZHU Qian, LUO Yan-yun. Characteristics and energies in different frequency bands of environmental noise in urban elevated rail[J]. Journal of Traffic and Transportation Engineering, 2018, 18(2): 120-128. doi: 10.19818/j.cnki.1671-1637.2018.02.013

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Characteristics and energies in different frequency bands of environmental noise in urban elevated rail

doi: 10.19818/j.cnki.1671-1637.2018.02.013

1.
Institute of Rail Transit, Tongji University, Shanghai 201804, China
2.
Ningbo Rail Transit Group Co., Ltd., Ningbo 315101, Zhejiang, China

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Author Bio:
LILi (1974-), female, associate researcher, PhD, lilee@tongji.edu.cn
Received Date: 2017-10-21
Publish Date: 2018-04-25

Abstract

Abstract

The environmental noises of bridge side of the first stage elevated line of Metro Line 1 in a city were compared and tested, where the common monolithic track beds without sound barrier and the slab mat track bed with closed sound barrier were used separately.The Aweighted total sound pressure level and 1/3 octave linear sound pressure level of each measuring point on the bridge side were analyzed.The linear sound pressure level cloud diagrams were plotted.Noise energy ratio in each frequency band was studied.Analysis result shows that the slab mat track bed with closed sound barrier can effectively reduce the noise at the noise source strength point and the environmental noise on the bridge side.The noise reduction effect and energy distribution are related to the locations of frequency band and measuring point.At measuring points of similar bridge height, the noise reduction effect decreases with the increase ofthe distance from the centerline of line, while the noise reduction effect at the near-ground point increases with the increase of the distance from the centerline of line.The noise reduction effect of slab track mattress with closed sound barrier is significantly higher in mid-high frequency range than in low frequency range.When the center frequency of the 1/3 octave is 20.0-31.5 Hz, 55.0 m away from the centerline of line, the linear sound pressure level of slab mat track bed with closed sound barrier is 0.82-6.96 dB higher than that of common monolithic track bed without sound barrier.In the section of common monolithic track bed without sound barrier, the noise energy is mainly below 200 Hz above the ground of 1.2 and 9.8 m, in 250-400 Hz above the ground of 11.3 m, in 400-1 000 Hz above the ground of 12.8 m.Above the ground of 11.3 m, below 200 Hz, the noise energies are nearly equal between the common monolithic track bed without sound barrier and the slab mat track bed with closed sound barrier.In the slab mat track bed area with closed sound barrier, the noise energy below 200 Hz at the bridge side is higher.Therefore, it is recommended to take targeted measures for vibration reduction and noise reduction according to the locations of sensitive points beside the elevated bridge, and to focus on the problems that low frequency noise appears prominently after it has lost the shielding of medium and high-frequency noise.
- urban rail transit,
- environmental noise,
- elevated bridge,
- 1/3 octave,
- noise energy,
- low frequency

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Characteristics and energies in different frequency bands of environmental noise in urban elevated rail

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