Transmission Reduction on noise Barriers with locally resonant Vibroacoustic Metamaterials

In the presented work an acrylic noise barrier demonstrator with vibroacoustic metamaterial is numerically designed, prototypically built and experimentally investigated in terms of noise transmission. To enlarge the stop band region, alternately differently tuned resonators are used. Within the stop band frequency-range from about 500 to 3000 Hz, a maximum reduction in noise transmission of 16 dB can be achieved. In comparison to the doubling of the wall thickness of the noise barrier, a reduction of up to 12 dB is observable.