Fractal labyrinthine acoustic metamaterial in planar lattices

Space-coiling fractal metamaterial with multi-bandgaps on subwavelength scale

FEA method is applied in order to investigate the bandgaps of two-dimensional (2D) phononic crystals which are composed with self-similarity hollow inclusions. Transmission spectra together with dispersion relations and displacement fields have been studied with FEA in detail. The simultaneous mechanisms of Bragg scattering enable multiterm bandgaps to be unfolded by the structure that can be effectively shifted by changing the lattice constant, matrix density and degree of self similarity. The smallest bandgap is located in the infrasonic wave range. Our results verify these phononic crystals with self-similar hollow inclusion structure which can change the number, location and width of bandgaps.

A hollow inclusion self-similarity phononic crystal with an ultra-low-frequency bandgap

Dual-functional hierarchical mechanical metamaterial for vibration insulation and energy absorption

Acoustic Metamaterial With Fractal Coiling Up Space for Sound Blocking in a Deep Subwavelength Scale

The influences of the T-square fractal holes on the band structures of two-dimensional phononic crystals with periodic distributed void pores are studied. Through using the finite element method, the dispersion relations in the two-dimensional phonoinc crystals with different level fractal holes are illustrated. The absolute bandgap can be easily formed in the phononic crystal with high level fractal holes, but hardly for first level ones. And the frequencies of the band structure are decreased with the increase of the fractal level. By analyzing the vibration modes of the unit cell of the phononic crystal, we find the origin of the lower frequency band is due to the locally resonant mechanism. Moreover, the impacts of the size of the fractal hole on the band structure are studied.

The influence of T-square fractal shape holes on the band structure of two-dimensional phononic crystals

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The influence of T-square fractal shape holes on the band structure of two-dimensional phononic crystals