A directive sound source array and a method for adjusting directivity using metamaterials

CN117351926BActive Publication Date: 2026-07-21HEBEI HANGUANG HEAVY IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HEBEI HANGUANG HEAVY IND
Filing Date
2023-08-30
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In the existing technology, parametric acoustic arrays are complex to design and manufacture, and the size of the speaker array is large, making it difficult to achieve efficient directional sound source control.

Method used

A directional sound source array designed with metamaterials achieves super-directivity of sound waves in multiple directions by distributing directional devices around non-directional sound sources, forming curved resonators using single-layer and double-layer fan-ring cavities, and optimizing the parameters of each component using a particle swarm optimization algorithm.

Benefits of technology

Super-directivity of the sound source is achieved in multiple directions, providing adjustable beam direction and width for directional sound sources, simplifying the design and manufacturing process, and improving the efficiency of directional sound source arrays.

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Abstract

The application provides a directional sound source array and a directional adjusting method realized by using a metamaterial, which comprises a non-directional sound source and four directional devices uniformly distributed around the non-directional sound source, a single-layer fan ring cavity or a double-layer fan ring cavity is arranged in a cylinder to obtain a single-layer curved surface resonator type directional device and a double-layer curved surface resonator type directional device; then, a multi-resonator coupling cylinder structure is used to control sound waves, a resonance mode in which a single pole mode and a double pole mode of the cylinder structure are coupled with each other is activated in a lower frequency range, the resonance mode of the cylinder structure excited by the sound source is coupled with the sound source to interact with each other, so that the sound waves have energy in a specified direction and are cancelled in the remaining directions, thereby realizing the super directivity of the sound source at a far field position; the application adopts four directional devices to form a directional array, can realize the super directivity in multiple directions at the same time, and provides a condition for preparing a directional sound source.
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