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

A metamaterial and coding technology, which is applied in non-rotational vibration suppression, electric controllers, controllers with specific characteristics, etc., can solve the problem that the 100Hz ultra-bandwidth vibration isolation effect cannot be achieved, and the metamaterial structure cannot be dynamically and actively adjustable. Issues such as rigidity and quality cannot be adjusted at the same time to achieve the effect of structural modularization, low cost and small volume

Active Publication Date: 2020-10-30
SHANGHAI JIAO TONG UNIV
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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

Method used

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

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Embodiment Construction

[0027] Such as Figure 1 ~ Figure 3 As shown, this embodiment relates to an active coded tunable metamaterial system for realizing broadband vibration isolation in the low frequency domain, including: an adjustable metamaterial unit cell 1, and the metamaterial unit cell 1 includes a matrix 101, an elastic element 102 and a mass Block 103. The metamaterial unit cells 1 with adjustable dynamic parameters are arranged periodically to form the supercell module 2, and the arrangement is coded orderly arrangement. Code 1 is to change the equivalent stiffness and equivalent mass of the metamaterial unit cell 1, and code 0 is to not change the dynamic equivalent parameters of the metamaterial unit cell 1. Different supercell modules 2 are vertically connected to form an active coding adjustable metamaterial system 3 .

[0028] The supercell module 2 can be made by 3D printing, laser cutting, numerical control machining, gluing and other manufacturing methods, and the material can b...

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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...

Claims

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Application Information

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IPC IPC(8): F16F15/08G05B11/42
CPCF16F15/08G05B11/42
Inventor 何清波李崇姜添曦彭志科
Owner SHANGHAI JIAO TONG UNIV
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