Tensegrity is a structural principle in biomechanics and architecture enabling to design rigid and mechanically stable structures by combining prestressed cables and isolated beams in compression. The present work reports a new class of tunable tensegrity-type metamaterials capable of manipulating the propagation of elastic waves by varying the level of prestrain in incorporated strings or/and manipulating the angle of rotation of inclined bars. We numerically demonstrate the generation of broadband low-frequency band gaps in the proposed meta-structures and analyze their evolution for different geometric and mechanical parameters. The transmission analysis demonstrates excellent wave attenuation efficiency by using a few metamaterial building blocks that makes the proposed meta-structures promising candidates for multiple engineering applications. Our design approach enriches the emerging class of mass-lattice metamaterials and provides meta-structures capable of attenuating elastic waves at broadband ranges in challenging low-frequency regimes.

Harnessing tensegrity to design tunable metamaterials for broadband low-frequency wave attenuation

Amendola A.;Miranda R.;Fraternali F.
2019

Abstract

Tensegrity is a structural principle in biomechanics and architecture enabling to design rigid and mechanically stable structures by combining prestressed cables and isolated beams in compression. The present work reports a new class of tunable tensegrity-type metamaterials capable of manipulating the propagation of elastic waves by varying the level of prestrain in incorporated strings or/and manipulating the angle of rotation of inclined bars. We numerically demonstrate the generation of broadband low-frequency band gaps in the proposed meta-structures and analyze their evolution for different geometric and mechanical parameters. The transmission analysis demonstrates excellent wave attenuation efficiency by using a few metamaterial building blocks that makes the proposed meta-structures promising candidates for multiple engineering applications. Our design approach enriches the emerging class of mass-lattice metamaterials and provides meta-structures capable of attenuating elastic waves at broadband ranges in challenging low-frequency regimes.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/4735573
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