Abstract:

As one of the main aerodynamic noise source of high-speed train, the trailer bogie is a complex structure containing many components and the distribution of the flow field around a vortex disorders, for trailer bogie aerodynamic forces and noise are poorly understood. According to the models of steady-state RNGk-ε turbulence and the broadband noise source, carry on a preliminary study for the trailer bogie aerodynamic drag, aerodynamic lift and aerodynamic noise source, and combine with the large eddy simulation of transient state and the theory of acoustic analogy, analyze the far-field aerodynamic noise. The results show that the larger vortex exists between the air spring and anti-yaw vibration absorber, nearby the adjacent area of windward’ axle box and the frame’ side; The aerodynamic drag, aerodynamic lift are proportional to the square of running speed; The largest component of total resistance are frame(24.02%), wheel set(19.30%), corbel(18.08%), brake pad, antiroll torsion bar, brake disc, frame bracket and air spring, what’s more corbel lift is the maximum which is about 157.88% of the total lift; Wheel set, aframe, brake pad, brake disc, corbel, vertical shock absorber, antiroll torsion bar and other parts which is windward side surface are the noise source of trailer bogie. In addition that frame has the largest contribution for the bogie’s total noise, second is the wheel set, then are the brake discs and corbel. Antiroll torsion bar, vertical shock absorber, air spring and horizontal shock absorber have less contribution to the total noise. Far-field noise of trailer bogie is broadband noise that has noise directivity, attenuation characteristic and amplitude characteristic. The main energy is concentrated in the range of 28-56 kHz. Low frequency energy of aerodynamic noise of trailer bogie main exist 50 Hz, 100 Hz and 160 Hz, and it’s distribution’s regular does not change with the speed of change.

Key words: aerodynamic noise, large eddy simulation, noise contribution, trailer bogie, high-speed train