Contribution
Predicting the Insertion Loss of Complex Noise Barrier Shapes Using a Versatile Numerical Testing Suite (2D)
* Presenting author
Abstract:
Standard noise emission estimators including the Nordic Prediction Method rely on a simple, ray-like representation of the sound path around an object. However, the computational efficiency of these models comes with a tradeoff: When calculating the insertion loss of complex barrier shapes, they often require approximate height corrections to yield accurate results. In the presented study a numerical testing suite was developed based on steady-state, acoustic Finite Element to capture complex effects such as diffraction, interference, and reflections around detailed geometries.The aim of the study was a case-specific comparison of several barrier designs intended for mitigation of high speed railway noise. These designs included varying T-shape widths, different diffraction-based tops, and a redirecting unit relying on passive, destructive interference. The simplest barrier case was validated successfully against the Nordic Prediction Method.