A Novel Sound-Absorbing Metamaterial Based on Archimedean Spirals

Area of Science:

• Acoustics
• Materials Science
• Electromagnetics

Background:

• Traditional acoustic metamaterials often rely on resonant cavities for sound absorption.
• A need exists for broadband sound absorbers applicable in engineering fields.

Purpose of the Study:

• To propose and investigate a novel acoustic metamaterial inspired by electromagnetic antennas.
• To achieve efficient broadband and low-frequency sound absorption using Archimedean spiral structures.

Main Methods:

• Developed a theoretical model using the transfer matrix method.
• Employed numerical simulations to analyze absorption performance and geometric parameter relationships.
• Fabricated samples using additive manufacturing for experimental validation.

Main Results:

• The proposed structure achieves efficient sound absorption across a wide frequency range.
• Absorption performance can be tuned for low-frequency applications by adjusting geometric parameters.
• Experimental validation confirmed the accuracy of theoretical and numerical models.

Conclusions:

• The novel Archimedean spiral acoustic metamaterial offers an effective solution for broadband sound absorption.
• The design's reliance on geometric parameters and viscous losses presents an alternative to resonant structures.
• This technology holds potential for practical engineering applications requiring advanced sound control.