Noise contribution and coherence analysis of high-speed train head shape under moving slab track

Abstract

Aerodynamic noise generated by 1:8 scale three carriages high-speed train was investigated by numerical simulation and wind tunnel test. The difference of far-field noise below 1600 Hz between simulation based on dense mesh and test is less than 3 dB(A), which indicates that the current simulation method has reasonable accuracy. It is found that dipole source can be used as the only sound source to calculate the far-field noise because its intensity is more significant than that of the quadrupole source. The subdomain method is applied to investigate the noise contribution and coherence analysis of full-scale head shape. It is found that the far-field noise contributions of the frame, bogie cavity and wheel set are significant, and the peak frequency occurs at the frequency of 630 Hz. Coherence analysis indicates that the far-field noise with the train body as the sound source has a relatively high correlation with the pressure pulsation caused by the vortex structure generated at the wiper housing and the bogie. Also, the side vortex near the front wheel has a higher correlation with the far-field noise at a higher frequency, while a stronger correlation between that near the rear wheel and the far-field noise occurs at a lower frequency.

Numerical investigation on aerodynamic noise sources identification and noise radiation characteristics of the bogie region of high speed train

“…However, due to that only the bogie cavity is modeled, the influence of the bogie on the cavity flow field and far-field noise is unclear, the coupling effect between the cavity and the bogie needs to be further studied. In a recent study, Li et al (2023) applied the subdomain method to the simulation of flow field of a full-scale train head and performed contribution and coherence analysis. They pointed out that the far-field noise contribution of the frame, bogie cavity, and wheelset is significant.…”