This paper investigates the main scale analysis of the aerodynamic noise in the foremost bogie area by the large-eddy simulation (LES) and the Ffowcs Williams-Hawkings (FW-H) analogy. The mechanism of the aerodynamic noise in this area has been excavated. The aerodynamic excitation results show that the bogie divides the bogie compartment into two cavities, each of which contains a large circulating flow and presents multi-peak characteristics in the frequency domain. The far-field noise results suggest that in the speed range of 200–350 km/h, the aerodynamic noise mechanism in the bogie area is the same. Cavity noise is the main noise mechanism in the foremost bogie area, and the bogie divides the bogie cabin into two cavities, thereby changing the aerodynamic noise in this area.

本文通过大涡模拟（LES）和Ffowcs Williams-Hawkings（FW-H）类比，研究了最前转向架区域空气动力学噪声的主要尺度分析。挖掘了该区域的空气动力学噪声的机理。空气动力学激励结果表明，转向架将转向架隔室分成两个空腔，每个空腔都包含很大的循环流量，并在频域中表现出多峰特性。远场噪声结果表明，在200–350 km / h的速度范围内，转向架区域的空气动力学噪声机理是相同的。空腔噪声是最前面转向架区域的主要噪声机制，转向架将转向架舱分成两个空腔，从而改变了该区域的空气动力学噪声。