- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LUO Wenfeng, WANG Honglin, WU Yudong, BI Haiquan, DING Weiping. Characteristics of Micro-Pressure Wave Noise at High-Speed Metro Tunnel Exits and Noise Reduction[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240194
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Micro-pressure waves are generated and noise is induced when the initial compression wave generated during the entry of a high-speed metro train into a tunnel propagates to the tunnel exit. In some cases, sonic booms may also occur, resulting in serious environmental problems for residents. To effectively control the micro-pressure wave noise at tunnel exits, numerical simulation studies on the acoustic characteristics of micro-pressure wave noise were conducted, and an acoustic suppression structure targeting low-frequency micro-pressure wave noise was proposed. Firstly, large eddy simulation (LES) was employed to obtain near-field unsteady flow field data at the tunnel exit, using the Ffowcs Williams-Hawkings (FW-H) acoustic analogy to predict the type of micro-pressure wave noise sources. Secondly, based on the unsteady flow field data, the acoustic finite element method (AFEM) was utilized to compute the far-field radiation of micro-pressure wave noise and analyze the mitigating effect of acoustic structures of the tunnel exit on micro-pressure wave noise. Finally, the accuracy of the numerical methods was validated through a moving model test. The results indicate that at a train speed of 160 km/h, dipole noise predominates in the micro-pressure wave noise at the tunnel exit. Dipole noise radiates outward in a semi-ellipsoidal shape, with its energy mainly concentrated below 20 Hz and a peak frequency being 4 Hz. The attenuation of dipole noise in the tunnel exit direction follows an exponential decay law. Adding acoustic structures at the tunnel exit significantly reduces micro-pressure wave noise. Specifically, the sound pressure levels (SPLs) outside the tunnel exit across various longitudinal planes decrease by approximately 3.00 dB. At the designated measurement points, located at 20 m and 50 m, the SPLs are reduced by 3.54 dB and 2.62 dB, respectively.
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