The impact of resonant additions’ footprint on the stop band behavior of 1D locally resonant metamaterial realizations

A metamaterial consisting of an acoustic black hole plate with local resonators for broadband vibration reduction

“…Such metamaterials generally involve the arrangement of sub-wavelength material designs periodically or randomly distributed on a host structure. In particular, locally resonant [49] acoustic metamaterials with periodic resonators have been extensively studied for vibration reduction [50][51][52], sound suppression [53][54][55], and wave manipulation [56,57]. Nevertheless, the frequency bandgaps that can be achieved with locally resonant metamaterials are usually very narrow.…”

The use of locally resonant metamaterials to reduce flow-induced noise and vibration

“…ratio between their respective modal eective masses and nominal masses, around 63%. The design approach also takes into account the footprint of the realizable resonators, since it is known that smaller footprints can lead to wider stop bands [53]. To be able to compare, in a later stage, the LRM reduction performance with an equivalent mass case, a block with its rst resonance frequency at 5260 Hz, i.e.…”

Development of the SmartAnswer Demonstrator: a Didactic Wind Tunnel for Aeroacoustic Applications

“…Nonetheless, the light designs exhibit worse noise, vibration, and harshness behavior, and novel low-mass and compact solutions are required to improve it. With this regard, locally resonant metamaterials can create frequency zones of strong vibration and/or noise attenuation, i.e., stop bands, by reducing the flow-induced vibrations of flexible structures and the consequential transmission of noise [31,32]. The technology consists of a flat plate onto which the resonant structures, called resonators, are glued.…”