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On aerodynamic noises radiated by the pantograph system of high-speed trains

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Abstract

Pantograph system of high-speed trains become significant source of aerodynamic noise when travelling speed exceeds 300 km/h. In this paper, a hybrid method of non-linear acoustic solver (NLAS) and Ffowcs Williams-Hawkings (FW-H) acoustic analogy is used to predict the aerodynamic noise of pantograph system in this speed range. When the simulation method is validated by a benchmark problem of flows around a cylinder of finite span, we calculate the near flow field and far acoustic field surrounding the pantograph system. And then, the frequency spectra and acoustic attenuation with distance are analyzed, showing that the pantograph system noise is a typical broadband one with most acoustic power restricted in the medium-high frequency range from 200 Hz to 5 kHz. The aerodynamic noise of pantograph systems radiates outwards in the form of spherical waves in the far field. Analysis of the overall sound pressure level (OASPL) at different speeds exhibits that the acoustic power grows approximately as the 4th power of train speed. The comparison of noise reduction effects for four types of pantograph covers demonstrates that only case 1 can lessen the total noise by about 3 dB as baffles on both sides can shield sound wave in the spanwise direction. The covers produce additional aerodynamic noise themselves in the other three cases and lead to the rise of OASPLs.

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Authors and Affiliations

  1. LMFS, Institute of Mechanics, Chinese Academy of Sciences, 100190, Beijing, China

    Hua-Hua Yu, Jia-Chun Li & Hui-Qin Zhang

Authors
  1. Hua-Hua Yu
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  2. Jia-Chun Li
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  3. Hui-Qin Zhang
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Corresponding author

Correspondence to Jia-Chun Li.

Additional information

The project was supported by the National Key Technology R&D Program (2009BAG12A03) and the Knowledge Innovation Project of Chinese Academy of Sciences of China (KJCX2-EW-L02-1).

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Yu, HH., Li, JC. & Zhang, HQ. On aerodynamic noises radiated by the pantograph system of high-speed trains. Acta Mech Sin 29, 399–410 (2013). https://doi.org/10.1007/s10409-013-0028-z

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  • DOI: https://doi.org/10.1007/s10409-013-0028-z

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