Actively Encoded Tunable Metamaterial System for Broadband Vibration Isolation in Low Frequency Domain

Abstract

An actively coded and adjustable metamaterial system for broadband vibration isolation in the low frequency domain, including at least two coded and adjustable metamaterial supercell modules, the metamaterial supercell modules are vertically connected, and each metamaterial supercell module is composed of A plurality of metamaterial unit cells arranged in an orderly manner form a planar structure; each metamaterial unit cell has an adjustable local resonance frequency, including the matrix, the elastic element arranged inside the matrix, and the mass block connected to the elastic element. Multiple unit cells constitute an adjustable "mass-stiffness-damping-matrix" system. The invention adopts the technical means of joint coding and adjustable equivalent stiffness and equivalent mass, and combines 3D printing technology and active control strategy. The proposed active coding and adjustable metamaterial system has modular structure, small volume, low cost, It has the advantages of wide working frequency and flexible regulation.

Description

technical field [0001] The invention relates to a technology in the field of low-frequency vibration-isolation materials, in particular to an active coded adjustable metamaterial system for low-frequency broadband vibration isolation. Background technique [0002] Low-frequency vibration isolation has a wide range of applications in precision mechanical engineering, on-orbit aerospace engineering, and civil protection engineering. In many complex situations, it is a technical challenge to realize actively adjustable low-frequency vibration isolation in a wide frequency range. At present, metamaterials have been developed for low-frequency vibration isolation due to their subwavelength-scale vibration isolation bandgap characteristics, so as to realize the design of low-frequency vibration isolation structures with small volume and light weight. In the method for active adjustable vibration isolation, the traditional adjustable metamaterial technology is mainly to adjust the...

AI Technical Summary

Problems solved by technology

In the method for active adjustable vibration isolation, the traditional adjustable metamaterial technology is mainly to adjust the equivalent dynamic parameters of the structure, that is, to adjust the vibration transmission by simply changing the equivalent stiffness or equivalent mass of the structure. Band gap, these methods cannot adjust the two dynamic parameters of stiffness and mass at the same time, so the vibration isolation effect of 100Hz ultra-bandwidth cannot be achieved in the low frequency range within 120Hz

Among the methods for broadband vibration isolation, traditional metamaterial vibration isolation strategies include local resonance Bragg bandgap mixing, multi-bandgap coupling, and topology optimization techniques. In these traditional structural designs, metamaterial structures cannot achieve dynamic active adjustable, which greatly limits its application in engineering

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