Structural Engineering and Mechanics

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Prediction and analysis of structural noise of a box girder using hybrid FE-SEA method

  • Luo, Wen-jun (MOE Engineering Research Center of Railway Environment Vibration and Noise, East China Jiaotong University) ;
  • Zhang, Zi-zheng (MOE Engineering Research Center of Railway Environment Vibration and Noise, East China Jiaotong University) ;
  • Wu, Bao-you (China Railway Electrification Engineering Group Company Limited) ;
  • Xu, Chang-jie (MOE Engineering Research Center of Railway Environment Vibration and Noise, East China Jiaotong University) ;
  • Yang, Peng-qi (JSTI Group Company Limited)
  • Received : 2020.01.02
  • Accepted : 2020.02.22
  • Published : 2020.08.25
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Abstract

With the rapid development of rail transit, rail transit noise needs to be paid more and more attention. In order to accurately and effectively analyze the characteristics of low-frequency noise, a prediction model of vibration of box girder was established based on the hybrid FE-SEA method. When the train speed is 140 km/h, 200 km/h and 250 km/h, the vibration and noise of the box girder induced by the vertical wheel-rail interaction in the frequency range of 20-500 Hz are analyzed. Detailed analysis of the energy level, sound pressure contribution, modal analysis and vibration loss power of each slab at the operating speed of 140 km /h. The results show that: (1) When the train runs at a speed of 140km/h, the roof contributes more to the sound pressure at the far sound field point. Analyzing the frequency range from 20 to 500 Hz: The top plate plays a very important role in controlling sound pressure, contributing up to 70% of the sound pressure at peak frequencies. (2) When the train is traveling at various speeds, the maximum amplitude of structural vibration and noise generated by the viaduct occurs at 50 Hz. The vibration acceleration of the box beam at the far field point and near field point is mainly concentrated in the frequency range of 31.5-100 Hz, which is consistent with the dominant frequency band of wheel-rail force. Therefore, the main frequency of reducing the vibration and noise of the box beam is 31.5-100 Hz. (3) The vibration energy level and sound pressure level of the box bridge at different speeds are basically the same. The laws of vibration energy and sound pressure follow the rules below: web

Keywords

Acknowledgement

This research is supported by the National Natural Science Foundation (51768022, 51978265), Jiangxi Provincial Science and Technology Innovation Team Construction Plan (20181BCB24011), Jiangxi Provincial Academic and Technical Leader Training Program (20194BCJ22009), and the National Science Fund for Distinguished Young Scholars (51725802), to which the authors are very grateful.

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