Adjustable single-stage multi-band-gap acoustic metamaterial structure and adjusting method

Abstract

The invention belongs to the technical field of acoustic metamaterials, and discloses an adjustable single-stage multi-band-gap acoustic metamaterial structure and an adjusting method. A basic structure is connected with concentrated mass through a plurality of vibration absorption springs and vibration absorption dampers at different positions; the vibration absorption dampers are located on onesides of the corresponding vibration absorption springs. The vibration absorption springs, the vibration absorption dampers and the concentrated mass form a single-stage vibrator; the plurality of single-stage oscillators are periodically arranged on the basic structure to form the single-stage adjustable multi-band-gap acoustic metamaterial. The method for generating the number of the band gaps and adjusting the positions of the band gaps by the acoustic metamaterial comprises the following steps of: periodically adding the metamaterial structure to a classic beam, a classic plate and a classic shell, and adjusting the number of the band gaps generated by the acoustic metamaterial and the positions of the band gaps by adjusting the rigidity of the vibration absorption springs, the dampingcoefficients of the vibration absorption dampers and the mounting positions of the vibration absorption springs. The single-stage adjustable oscillator is periodically arranged on a beam, a plate anda shell of a traditional continuous structure, so that the vibration transmissibility on the beam, the plate and the shell is remarkably reduced in a generated band gap.

Description

technical field [0001] The invention belongs to the technical field of acoustic metamaterials, and in particular relates to an adjustable single-stage multi-bandgap acoustic metamaterial structure and an adjustment method. Background technique [0002] At present, the purpose of constructing acoustic metamaterial beams, plates, and shells with additional local resonance oscillators is to generate low-frequency, broadband, and multi-frequency band gaps to suppress the transmission of low-frequency and different frequency band vibrations. The configuration of acoustic metamaterials that produce multi-frequency band gaps is mainly through the addition of multi-level oscillators, while the configuration of acoustic metamaterials that generate low-frequency band gaps is mainly through the addition of concentrated mass, and broadband acoustic metamaterials can be achieved by coupling multiple band gaps. achieve. Analyzing different configurations of acoustic metamaterials, adding...

AI Technical Summary

Problems solved by technology

Increasing the number of vibrators can produce multiple band gaps in metamaterial beams and plates, but increasing the number of vibrators will increase the proportion of the vibrator mass, making the structure bulky

[0004] Through the above analysis, the problems and defects of the existing technology are: the performance of the single-stage vibrator in the prior art is poor, and the acoustic metamaterial beam and plate structure mainly has high vibration suppression frequency bands and few vibration suppression frequency bands.

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