A time-domain broadband acoustic carpet-type invisibility cloak and method of making the same

An invisibility cloak and carpet technology, applied in the field of acoustic carpet cloaks and production, can solve the problem of inability to achieve time-domain broadband stealth and other problems
CN112254579BActive Publication Date: 2022-07-19TIANJIN UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN UNIV
Publication Date
2022-07-19

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Abstract

The invention belongs to the technical field of acoustics, and in particular relates to a time-domain broadband acoustic carpet-type invisibility cloak and a manufacturing method. By combining a broadband sound pressure local reflection theorem and a parameter optimization method, a multi-layer air square hole stacking The structure of the metasurface is the basic structural unit of the metasurface, and a time-domain broadband metasurface structure is designed by using genetic algorithm reverse optimization; Stealth, its relative bandwidth has reached more than 93%, and at the same time, it exhibits the stealth performance of time-domain broadband under the incidence of multi-frequency pulses, breaking the limitation of narrow bandwidth of traditional passive metasurfaces and the defects of tunable metasurfaces time-domain broadband. The structural design of acoustic metasurfaces and the practical application of broadband acoustic devices provide a key research basis.
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Description

technical field

[0001] The invention belongs to the technical field of acoustics, and in particular relates to a time-domain broadband acoustic carpet-type invisibility cloak and a manufacturing method. Background technique

[0002] In recent years, acoustic metamaterials have demonstrated a unique ability to manipulate sound waves. As a two-dimensional planarization of acoustic metamaterials, the thickness of the acoustic metasurface is controlled within the sub-wavelength scale, and the phase and amplitude of the acoustic wave can be arbitrarily regulated only by the gradient arrangement of one layer of microstructure units, thereby Achieving the goal of controlling large wavelengths with small size, breaking the limitation of large size of bulk acoustic metamaterials.

[0003] The regulation of acoustic waves by acoustic metasurfaces is usually based on the generalized Snell's theorem, which controls the propagation direction of acoustic waves by setting the phase distri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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