High frequency traction rod model and its structure-borne sound transmission characteristic of high-speed trains

With respect to high-speed trains, a significant proportion of interior noise is caused by high-frequency vibrations, which are generated at the wheel-rail contact and transmitted through the secondary suspension system in the bogie, to the carbody. Among suspension components, the effect of the traction rod is always underestimated. To research this structure-borne sound transmission, a structure-borne sound model of the traction rod was established, and introduced into a 3D train/track coupled dynamic model. This is suitable to research dynamic behavior at high frequencies, since it considers the inertial effect of heavy and suspension components. The simulated results of these models show that the traction rod force within 26 Hz significantly increases during variable-speed operation, due to the large vertical and pitch movements of the carbody, caused by acceleration and deceleration. In the 26-1000 Hz range, the structural eigenmodes of the traction rod are excited, causing many maxima to occur in the traction force curves. The power contribution rate of the traction rod to the carbody in the 32-259 Hz range varies significantly, from less than 20%, to more than 40%, at different running stages. The influence of the traction rod on structure-borne sound cannot be neglected.