Experimental Analysis and Simulation of a Porous Absorbing Layer for Noise Barriers

Experimental Analysis and Simulation of a Porous Absorbing Layer for Noise Barriers

Blog Article

Noise barriers are common noise mitigation measures usually implemented near roads or railways, with proven efficiency.This work presents a study of a porous concrete material incorporating expanded clay as aggregate, to be used on the sound-absorption layer of noise barriers.A theoretical material model is calibrated using experimental data and then used to estimate the diffuse field sound absorption from the normal incidence sound absorption estimation/measurement.

Validation of such estimation is performed Play Tents by comparing to reverberant room measurements.Numerical simulations are carried out using the boundary element method (BEM) and the CNOSSOS-EU calculation method to assess the performance of different types of barriers incorporating this material.L-shaped and vertical barriers are tested, as well as low-height and conventional (taller) barriers, Shuffleboard employed in the context of a railway noise scenario.

Different results are obtained by the two methods, mainly due to the different underlying physical principles.Good insertion loss values may be obtained using both conventional and low-height noise barriers together with the porous concrete material if a careful choice of its location within the barrier is made.