Meta-Kagome lattice structures for broadband vibration isolation: Fid-Bau Portal

Meta-Kagome lattice structures for broadband vibration isolation

An, Xiyue / Yuan, Xinfeng / Fan, Hualin

Highlights • The meta-Kagome lattice (MKL) structure is innovatively constructed with broadband vibration isolation performance. • The load-bearing capacity of the MKL structure can be improved by adding interfaces. • The vibration isolation performance of the sandwich structures composed of MKL cores is studied. • The samples were fabricated by 3D printing technology and the transmission tests were conducted to verify the results.

Abstract One-dimensional (1D) phononic crystal (PC) beams have been extensively studied due to their bandgap properties, but the idea of using this functional beam components to form three-dimensional (3D) periodic structures has rarely been mentioned. In this paper, the PC beam element is used to replace the ordinary member of the conventional Kagome lattice structures, thus, a meta-Kagome lattice (MKL) structure is innovatively constructed with broadband vibration isolation performance. The dispersion analysis is performed to reveal the mechanism of bandgap formation and the reason of getting broad bandgaps. Three kinds of MKL structures, namely, with triangular, rectangular and hexagonal pyramids are designed. The vibration transmission properties of the MKL columns with or without interfaces are studied to illustrate the isolation effect. Moreover, the vibration isolation performance of the sandwich structures composed of MKL cores is also studied, and the influence of the skin characteristics on the properties is discussed. Vibration transmission tests were conducted to verify the results. This work provides a new method to develop 3D multi-functional lattice structures, especially for load-bearing and vibration reduction.