Abstract
With the continuous increase in the operating speed of trains, the fluctuating pressure on noise barriers has increased rapidly. The development of perforated noise barriers, which can reduce this fluctuation, is imperative. Based on diffraction theory, in this study, the relationship between the transmission loss (TL) and insertion loss (IL) of noise barriers is investigated with wheel/rail noise. Subsequently, the finite element method (FEM) model, using the three-dimensional FEM and one-dimensional wave equation, is used to predict the TL of the noise barriers. The verification of the predictive model is classified into two parts: theoretical and experimental. In theoretical validation, the rigid barrier without absorption materials is analogous to the double chamber muffler for verification using the FEM. In experimental verification, the predicted TL of the V-shaped noise barrier is compared with the experimental results of the reverberation chamber. Finally, the perforated combination, angle, and opening ratio of the V-shaped barriers were modeled to improve the TL.
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