Active coding adjustable metamaterial system for broadband vibration isolation of low frequency domain

Abstract

An active coding adjustable metamaterial system for broadband vibration isolation of a low frequency domain comprises at least two coding adjustable metamaterial super-cell modules which are connectedvertically; each metamaterial super-cell module forms a plane structure through a plurality of metamaterial unit cells distributed in sequence periodically; each metamaterial unit cell has an adjustable local resonance frequency, and comprises a substrate and an elastic element and a mass block connected with the elastic element, and the elastic element and the mass block are arranged in the substrate; and a plurality of unit cells form an adjustable "mass-rigidity-damping-substrate" system overall. According to the active coding adjustable metamaterial system, by adopting a joint coding adjustable technical means with equivalent rigidity and equivalent mass, a 3D printing technology and an active control strategy are combined, and the proposed active coding adjustable metamaterial systemhas the advantages of a structural module, small size, low cost, wide working frequency band, flexible control, etc.

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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