Abstract:

In order to study characteristics of the interior aerodynamic noise of the high-speed train, the computational model of the interior aerodynamic noise of the high-speed train is set up based on the statistical energy analysis method, which includes 422 car-body structural subsystems and 170 interior acoustic cavity subsystems. The modal density and internal loss factor for each subsystem, and the coupled loss factor for different subsystems, are computed based on the theoretical formula. The turbulent boundary layer inputs on the carbody subsystems are obtained using the large eddy simulation, and then the interior aerodynamic noise of the high-speed train is computed and analyzed. Computational results show that the fluctuating pressure spectrums on the carbody subsystems decrease with the increasing of the frequency. The sound pressure level of the interior aerodynamic noise for each frequency increases with the increasing of the train speed. The sound pressure level of the interior aerodynamic noise of the high-speed train has low frequency characteristics for the liner-weighted sound pressure level and has broadband characteristics for the A-weighted sound pressure level. For the A-weighted sound pressure level, the sound energy is mainly distributed between 100-2 000 Hz for the drive’s cab cavity and 50-2 000 Hz for the passenger compartment cavity. The linear-weighted and A-weighted sound pressure level of the interior aerodynamic noise of the high-speed train has a linear relationship with the logarithm of the train speed.

Key words: aerodynamic noise, fluctuating pressure, large eddy simulation, statistical energy analysis, high-speed train