Combining iterative modal strain energy method with BEM-SEA to predict structural noise from railway composite bridge damped with CLD

This paper presents a combined method to predict structural noise from railway composite bridge damped with constrained layer damping (CLD), in which the frequency-dependent properties of the viscoelastic material are accurately considered through the iterative modal strain energy (IMSE) method. To efficiently determine the forces transmitted to bridge, a simplified vehicle-track coupling model is proposed. Taking 200 Hz as the boundary frequency, the IMSE-boundary element method (BEM) and the IMSE-statistical energy analysis (SEA) are used in the frequency range of 20 ~ 200 Hz and 200 ~ 2000 Hz to realize the full-band noise prediction. Then, the on-site noise tests of a three-span railway composite bridge are carried out to verify the proposed method. Finally, the influences of the key design parameters of CLD on noise reduction are discussed, so as to provide reference for the research and application of CLD in railway bridge engineering.