Aeroacoustic sources of high speed maglev trains

This paper summarizes information from several studies regarding aeroacoustic sources of highspeed magnetically levitated trains (maglev). At low speed, the propulsion system, auxiliary equipment, and mechanical/structural radiation are the predominant sources of noise from maglev. At high speed, aeroacoustic sources dominate the noise. Noise from airflow over a train (aeroacoustic noise) is generated by flow separation and reattachment at the front, turbulent boundary layer over the entire surface of the train, flow interactions with edges and appendages, and flow interactions between moving and stationary components of the system. This paper discusses aeroacoustic mechanisms at the noise, the mechanisms related to the turbulent boundary layer, and edge mechanisms.