Phononic metastructures with ultrawide low frequency three-dimensional bandgaps as broadband low frequency filter

Abstract Vibration and noise control are among the classical engineering problems that still draw extensive research interest today. Multiple active passive techniques to resolve these have been reported, however, challenges remain substantial. The recent surge of activities on acoustic metamaterials for vibration testimony fact metamaterial is no longer limited pure theoretical concepts. For over an ultrawide frequency region, 3-D metastructures emerge as a novel solution tool this problem. In context, present study reports proposal monolithic phononic with capability induce low three-dimensional bandgaps relative bandwidth enhancements 157.6% 160.1%. proposed metastructure designs consist elastic frame assembly connected rigid cylindrical masses. Such structural configuration mimics monoatomic mass-spring chain where spring mass. We develop analytical model based determine mode responsible opening bandgap. wave dispersion reveals presence both types metastructures. modal analysis shows distribution energy in bandgap ( global resonant ) closing local bounding edges. further analyze band structures discuss physical concepts govern such attenuation inside range demonstrated by response studies conducted two different finite element models. Thanks additive manufacturing technology, prototypes prepared amplitude test performed validate numerical findings. Experimental results show zone spreads broadband spectrum. reported scale material independent. methodology, modelling design strategy presented here may pave way development meta-devices noises range.