Volume 21 Issue 3
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2021  >  21(3): 258-268
ZHANG Shu-min, SHI Jia-wei, SHENG Xiao-zhen. Aerodynamic excitation characteristics of pantograph area and their effects on interior noise[J]. Journal of Traffic and Transportation Engineering, 2021, 21(3): 258-268. doi: 10.19818/j.cnki.1671-1637.2021.03.018
Citation: ZHANG Shu-min, SHI Jia-wei, SHENG Xiao-zhen. Aerodynamic excitation characteristics of pantograph area and their effects on interior noise[J]. Journal of Traffic and Transportation Engineering, 2021, 21(3): 258-268. doi: 10.19818/j.cnki.1671-1637.2021.03.018
shu

Aerodynamic excitation characteristics of pantograph area and their effects on interior noise

doi: 10.19818/j.cnki.1671-1637.2021.03.018
  • 1.

    State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China

Funds:

National Natural Science Foundation of China U1834201

National Key Research and Development Program of China 2016YFE0205200

More Information
  • Author Bio:

    ZHANG Shu-min(1990-), female, doctoral student, fxzhangshumin@163.com

    SHENG Xiao-zhen(1962-), male, professor, PhD, shengxiaozhen@hotmail.com

  • Received Date: 2021-01-19
    Available Online: 2021-08-27
  • Publish Date: 2021-08-27
    Abstract
  • Based on a three-dimensional compressible viscous fluid model, the unsteady flow field in the pantograph region at a speed of 350 km·h-1 was simulated, and the characteristics of the fluctuating pressure of the pantograph platform were analyzed. The wavenumber decomposition method was used to separate the fluctuating pressure on the pantograph platform, and the convective and acoustic pressures were obtained. The wavenumber and frequency domain characteristics of the two pressures were analyzed. Based on the statistical energy analysis method, a simplified prediction model of interior noise in the pantograph region was established, and the influences of two types of excitations on interior noise were analyzed. Analysis results show that the fluctuating pressure of the pantograph platform exhibits a significant low-frequency characteristic. With an increase in the frequency, the amplitude of the fluctuating pressure of the pantograph platform decreases rapidly. The wake vortex of the pantograph base frame and the insulators are the main factors that affect the amplitude of the fluctuating pressure of the pantograph platform. Considering the aerodynamic noise of high-speed train running at 350 km·h-1, the wavenumber decomposition method can be used to separate the two types of excitation effectively. The amplitude of the acoustic pressure of the pantograph platform is much smaller than that of the convective pressure. The main difference occurs in the frequency band of 800-3 500 Hz, and the maximum difference is approximately 20 dB. As the frequency increases, the difference becomes smaller. Although the amplitude of the acoustic pressure is considerably smaller than that of the convective pressure, its effect on the interior noise is greater. When the frequency is above 2 500 Hz, the interior sound pressure level response caused by the acoustic pressure excitation is approximately 10-20 dB higher than that caused by the convective pressure excitation. This is because the energy distribution difference between the two types of excitations in the wavenumber domain causes the acoustic pressure to have a higher transmission efficiency, especially when the frequency is higher than the critical value for the structure. The contribution of the acoustic pressure is dominant, and its effect on the interior noise cannot be ignored. 16 figs, 30 refs.

     

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