Computational Method of the Interior Aerodynamic Noise of the High-speed Train

Abstract

The computational method of interior aerodynamic noise of the high-speed train was proposed based on the large eddy simulation (LES) and statistical energy analysis (SEA). Based on the SEA theory, the computation model of the interior aerodynamic noise was established, which included 422 car-body structural subsystems and 170 interior acoustic cavity subsystems. The fluctuating pressure spectrums on the car-body structural subsystems were obtained by the LES, and then the interior aerodynamic noise of the high-speed train was computed and analyzed. Computational results show that the sound pressure level of the drive’s cab cavity and passenger compartment cavity has low frequency characteristics for the linerweighted sound pressure level and has broadband characteristics for the A-weighted sound pressure level. For the A-weighted sound pressure level, the sound energy of the drive’s cab cavity is mainly distributed between 100~2000Hz, the sound energy of the passenger compartment cavity is mainly distributed between 50~2000Hz. The sound pressure level of the interior aerodynamic noise can be reduced for every frequency by improving interior sound absorption performance and increasing the damping of the car-body plate.