Study of Low-frequency Band Gaps and Vibrational Properties in Novel Monophasic Metamaterials
Low frequency vibration and noise suppression has always been a problem that needs to be overcome.Therefore,a novel single-phase metamaterial structure is proposed in this paper.Based on Bloch's theorem and finite element method,the bandgap characteristics and formation mechanism of the proposed structure are numerically analyzed,and the dependence of the bandgap on geometric size is parameterized.The propagation characteristics of waves in the structure are explored using three-dimensional dispersion surfaces,frequency contours,phase velocity,and group velocity,Moreover,the attenuation of elastic waves in finite size lattices was analyzed,verifying the effective suppression effect on band gaps on elastic waves.The results indicate that the proposed structure has excellent bandgap characteristics,and the bandgap is sensitive to geometric dimensions,which can achieve tunable bandgap.The proposed structure can effectively suppress elastic waves within a frequency range of 1000Hz.It provides important clues and ideological guidance for the design of devices with low-frequency vibration isolation performance.
low frequency bandgapwave propagationvibration suppressiongroup velocityphase velocity
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