Abstract
Phononic crystals (PCs) and acoustics/elastic metamaterials (AMs/EMs) have aroused increasing attentions for potential applications in low-frequency vibration control due to their outstanding mechanical and physical performances. So far, most reported metamaterials aim to obtain low-frequency broad band-gaps as required to satisfy the practical application. In this paper, we propose a new lightweight low-frequency broadband metamaterial beam. The low-frequency broadband from 390 to 920 Hz of the proposed metamaterial beam is confirmed through vibration transmittance frequency response functions (FRFs) obtained numerically and experimentally. Finally, the steady-state vibration deformations are acquired to illustrate the attenuating effect of the metamaterial beam band-gaps. The research in this paper offers a novel and advantageous method for designing of structures that both broadband damping and lightweight required, such as space-arm and framework of antenna in the field of aerospace.
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