Investigation of a Plate with Vibroacoustic Metamaterials tuned to the coincidence Frequency of the Plate

The present work addresses the investigation of an aluminum plate with vibroacoustic metamaterial, where the natural frequency of the attached resonators is tuned to the coincidence frequency of the base plate. The work involves numerical prediction of the stop band, manufacturing of the prototype and validation measurements in terms of structural dynamics and acoustic emission. In the frequency ranges of 1480 -2040 Hz and 2310 -2995 Hz, two significant stop bands can be observed. In the stop band regions, a vibration reduction of up to 36 dB and a reduction of the sound power level of up to 38 dB can be achieved compared to doubling the thickness of the base plate.