Characteristics and Mechanism Analysis of Aerodynamic Noise Sources for High-Speed Train in Tunnel

Figure 14

Contour of on the high-speed train (units: Pa/s; free flow speed: 83 m/s): (a) 16 Hz, (b) 400 Hz, (c) 800 Hz, (d) 2 kHz, (e) 6.3 kHz, and (f) 10 kHz.