Design of a multi-resonator metamaterial for mitigating impact force

Abstract

In this paper, we propose a new multi-resonator metamaterial (MRM) for attenuating impact stress waves. Theoretical analyses show that the MRM has wider band gaps than those of a single-resonator metamaterial (SRM) and a dual-resonator metamaterial (DRM), and numerical studies are conducted to compare the performances of the MRM, SRM, and DRM in mitigating impact forces. The influences of the number of unit cells, the spring stiffnesses, and the resonator masses on the mitigation of impact force are analyzed by studying a one-dimensional impact wave model. In addition, the calculation results of a three-dimensional crash model clearly confirm the outstanding features of the MRM, which can provide a thin and light structure with a wider attenuation region of the frequency spectrum and a better mitigation effect of the impact force.

MetaNOR: A Meta-Learnt Nonlocal Operator Regression Approach for Metamaterial Modeling

“…Metamaterial is a group of artificial heterogeneous materials exhibiting unusual yet desired frequency dispersive properties from its composite microstructure. In the past decade, there have been increasing research interests in metamaterials in scientific and engineering communities, because of its applications in acoustic attenuation, noise control, and invisibility cloaking [1]. Metamaterials has been studied theoretically, numerically and experimentally [2][3][4], to optimize its microstructure for dispersive properties and performances in different environments.…”

Attenuation of impact waves in a nonlinear acoustic metamaterial beam

“…Properties and applications of linear acoustic metamaterials (LAMs) have been extensively studied [27][28][29][30][31][32][33], in which AMs are introduced to mitigate impact vibrations [18,34]. Metamaterials with single-, dual-and multi-resonators can enable negative effective mass densities, conducive to impact wave attenuation [35,36].…”

Mitigation of impact force through optimisation of three-phase locally resonant structures

“…On this basis, Khan, et al [23] presented a one-dimensional spring mass system, and the propagation characteristics of low-frequency stress wave under impact load was studied. Li, et al proposed the elastic LRSs with multiple oscillators [24][25][26] , and the viscoelastic was also considered [27] in the LRSs to mitigate the impact load in time domain and frequency domain. In short, the above researches have proved the feasibility of impact load mitigation based on LRSs.…”