Vibroacoustic damping optimisation of high-speed train floor panels in low- and mid-frequency range

Abstract

As a good noise and vibration reduction material, water-based damping coating is widely used in railway floor structures. However, spraying the entire top and bottom surfaces of the railway floor results in excessive mass increase. Thus, a modal adaptive damping treatment optimisation design was proposed for the railway floor structures. In addition, the vibroacoustic performance was improved by the damping treatment with lightweight design considerations. Moreover, an approximate model was applied instead of the time-consuming regular calculation model for the optimisation design of high-speed train floors. For the train running at speeds of 250, 300, and 350 km/h, the mass of the damping treatment was reduced by 14.6% compared to the original design; the overall radiated sound power levels of the railway floor were decreased by 1.7, 1.1, and 0.7 dBA.