N-order acoustic meta-material low-frequency sound insulation structure

Abstract

The invention discloses an N-order acoustic meta-material low-frequency sound insulation structure, which relates to the technical field of mechanical noise and environmental noise control. The N-order acoustic meta-material low-frequency sound insulation structure comprises a plurality of (N-1)-order acoustic meta-material low-frequency sound insulation structures extending in an array mode in xand y directions, N-order mass blocks adhered to the centers of the (N-1)-order acoustic meta-material low-frequency sound insulation structures, and an external supporting frame, wherein N>=2; when Nis equal to 2, the second-order acoustic meta-material low-frequency sound insulation structure comprises a plurality of acoustic meta-material unit cells extending in an array mode in the x direction and the y direction and the second-order mass blocks attached to the center of the extending structures; and a sound insulation peak generated by the N-order acoustic meta-material low-frequency sound insulation structures is generated by a modal coupling anti-resonance effect of acoustic meta-materials of adjacent orders, and the N-order mass block is used for enhancing the modal coupling anti-resonance effect. The N-order acoustic meta-material low-frequency sound insulation structure has the advantages of being simple in structure, easy to adjust and the like, meanwhile, the structure haslarge expansion space, and potential application prospects are achieved for multi-frequency sound insulation within the low-frequency range.

Description

technical field [0001] The invention relates to the technical field of mechanical noise and environmental noise control, in particular to an N-order acoustic metamaterial low-frequency sound insulation structure. Background technique [0002] With the extensive use of electromechanical equipment, the problem of noise is becoming more and more serious in our daily production and life. Especially the isolation of low-frequency noise is more difficult, because low-frequency noise has a longer wavelength and can easily penetrate the sound barrier. According to the law of mass, it can be known that the use of traditional homogeneous materials for noise attenuation requires a sufficiently large surface density of the structure, which often makes the weight and thickness of the sound insulation structure too large, making it difficult to use in practical engineering. However, the emergence of acoustic metamaterials has brought new ideas and methods for noise control. Acoustic met...

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Problems solved by technology

[0004] However, the current research shows that when the acoustic metamaterial unit cell array is extended to a large-scale structure, its sound insulation performance is different from that of the acoustic metamaterial unit cell, that is, the low-frequency sound insulation design for the unit cell is no longer suitable for large-scale structures. The scale structure, and the low-frequency sound insulation performance of the extended structure after the unit cell array is very poor, and it is difficult to form an effective low-frequency sound insulation peak

This problem severely limits the engineering application performance of acoustic metamaterials in low-frequency sound insulation

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