Simulation and Experimental Analysis of Aerodynamic Noise Generated by 600 km·h-1 High-Speed Maglev Train

Abstract:

In order to explore the aerodynamic noise characteristics of high-speed maglev trains， a TR08 high-speed maglev train was taken as the research object. Considering the compressibility of air， detached eddy simulation （DES） was used to calculate the transient flow field around the train. Based on the Lighthill acoustic analogy theory， the acoustic finite element method was used to calculate the aerodynamic noise. The accuracy of the numerical model was verified by comparing the online test data with the numerical simulation results. The results show that the aerodynamic noise of the high-speed maglev train is a kind of broadband noise. The noise sources are mainly distributed in the areas with a strong air separation and turbulence， such as the streamlined shoulders of the head and tail cars. When the train speed is 600 km·h^-1， the equivalent continuous A-weighted sound pressure level reaches 107.5dB（A） within the train passing time where the position is 25m from the track centerline and 3.5m above the track surface， and the noise peak is 101.9dB（A） which is at the center frequency of 1 600Hz in the 1/3 octave band.

Key words:high-speed maglev train;aerodynamic noise;Lighthill acoustic analogy;acoustic finite element method