Sound barriers based on metamaterials

Currently, airborne sound insulation is achieved simply by the mass of the materials used and good sealing of the noise barrier elements towards the uprights. The aim is to simulate, design and evaluate laboratory demonstrators using acoustic measurements. These laboratory demonstrators are measured on a specially built test rig and compared with the results of the simulation. At the same time, work is also being carried out on production development and testing the cost-effectiveness of manufacturing the new sound barriers. Once the optimisation work has been completed, final laboratory demonstrators and prototypes will be built. The prototypes are subjected to various acoustic measurements, which are later required for certification. For example, measurements are carried out in the reverberation chamber to determine the sound reflection and on the window and wall test bench to measure the airborne sound insulation. In addition, these parameters are also measured in-situ in a real structure.