Statistical energy prediction for environmental noise around box-girders caused by train running.

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Bibliographic Details
Title:	Statistical energy prediction for environmental noise around box-girders caused by train running.
Authors:	Wei, Xuanwan¹ (AUTHOR) weixuanwan@126.com, Lei, Peng¹ (AUTHOR), Wu, Meiqiong¹ (AUTHOR), Fang, Qile² (AUTHOR)
Source:	Journal of Mechanical Science & Technology. Apr2025, Vol. 39 Issue 4, p1791-1798. 8p.
Subjects:	Statistical energy analysis, Civil engineering, Box beams, Acoustic radiation, Acoustic field
Abstract:	This study first established an acoustic prediction model for subway box girder bridges using the statistical energy analysis (SEA) method. Second, wheel-rail forces and noise in the frequency domain were computed based on the wheel-rail-track impedance model. Following this, vibration-induced noise emanating from the box girder structure was calculated, and the model was validated. Finally, utilizing the acoustic model, the fundamental sound field distribution patterns at the bridge side, as well as the attenuation laws of sound pressure levels (SPLs) in both horizontal and vertical directions, were analyzed. The results indicate that the acoustic predictions from the box girder acoustic model align well with measured SPLs within the analyzed frequency range of 20–2000 Hz. Maximum structural acoustic radiation occurs at the wheel-rail excitation point, decaying radially with faster attenuation for high-frequency SPLs compared to low frequencies. In the horizontal direction, the combined effects of structural noise from the box girder and wheel/rail noise result in higher SPLs radiating further, with notable attenuations of approximately 6 dB and 15 dB at horizontal distances of 7.5, 15, and 25 meters, respectively. Vertically, the SPL peaks at 11.3 meters due to the superposition of flange and web vibrations with wheel/rail noise, while it is minimal near the ground. At 11.3 meters from the bridge, vertical SPLs decay by approximately 1 dB (0.3 dB on the far side) and up to 20 dB (8 dB on the far side) towards the ground. It can better investigate the vibration transmission in subway box girders and the characteristics of ambient noise at the bridge side. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	This study first established an acoustic prediction model for subway box girder bridges using the statistical energy analysis (SEA) method. Second, wheel-rail forces and noise in the frequency domain were computed based on the wheel-rail-track impedance model. Following this, vibration-induced noise emanating from the box girder structure was calculated, and the model was validated. Finally, utilizing the acoustic model, the fundamental sound field distribution patterns at the bridge side, as well as the attenuation laws of sound pressure levels (SPLs) in both horizontal and vertical directions, were analyzed. The results indicate that the acoustic predictions from the box girder acoustic model align well with measured SPLs within the analyzed frequency range of 20–2000 Hz. Maximum structural acoustic radiation occurs at the wheel-rail excitation point, decaying radially with faster attenuation for high-frequency SPLs compared to low frequencies. In the horizontal direction, the combined effects of structural noise from the box girder and wheel/rail noise result in higher SPLs radiating further, with notable attenuations of approximately 6 dB and 15 dB at horizontal distances of 7.5, 15, and 25 meters, respectively. Vertically, the SPL peaks at 11.3 meters due to the superposition of flange and web vibrations with wheel/rail noise, while it is minimal near the ground. At 11.3 meters from the bridge, vertical SPLs decay by approximately 1 dB (0.3 dB on the far side) and up to 20 dB (8 dB on the far side) towards the ground. It can better investigate the vibration transmission in subway box girders and the characteristics of ambient noise at the bridge side. [ABSTRACT FROM AUTHOR]
ISSN:	1738494X
DOI:	10.1007/s12206-025-0307-1