Acoustic Radiation Study of a Box Girder Viaduct Considering the Frequency-Dependent Viscoelasticity of the Rail Pad

In order to investigate the mechanism of frequency-dependent viscoelasticity rail pad on acoustic radiation characteristics a box girder viaduct, this study establishes high-order model its dynamic parameters reveal frequency-varying pad, and vehicle–track–viaduct vertical coupling model. Finally, viaduct are analyzed by combining finite element method boundary theory. The results show that S-stiffness D-stiffness increase with in frequency, frequency sensitivity is greater than D-stiffness. characterization has good fitting effect. main influence band variable wheel–rail force equivalent discrete spring sliding layer 30–90 Hz, resulting shift dominant high 4 Hz. We consider will cause pressure level field point 4–6 which greatest sound each at Peak Frequency Point Insertion Loss (PFPIL), degree consistent, maximum value total surface increasing 4.1 dB. Without considering 20–53 Hz be overestimated 53–100 underestimated. panel power contribution coefficient obviously different points.