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Fabricating Metamaterials Using the Fiber Drawing Method

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Published on: October 18, 2012

Triangular reentrant honeycomb metamaterial structure for broadband sound attenuation using shape memory polymers.

Musa'ab Ejaz¹, Nabihah Sallih², Yasir Mujahid¹

¹Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar, 32610, Perak, Malaysia.

Scientific Reports

|October 21, 2025

Summary

A novel metamaterial earmuff insert allows speech passage while blocking hazardous noise. This innovation enhances workplace safety and communication for users of passive noise cancellation devices.

Keywords:

Bragg scattering Helmholtz resonator Local resonance Metamaterial design Sound absorption coefficient Transmission loss

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Area of Science:

Acoustics
Materials Science
Metamaterials

Background:

Passive noise cancellation (PNC) earmuffs protect against workplace noise but hinder communication.
Removing earmuffs for communication exposes workers to hazardous noise levels.

Purpose of the Study:

To develop a metamaterial earmuff insert enabling speech intelligibility and high-frequency noise blocking.
To evaluate the acoustic performance and communication capabilities of the novel design.

Main Methods:

Finite element modeling (FEM) to analyze bandgaps and frequency response of a triangular reentrant honeycomb metamaterial.
Impedance tube experiments to measure sound absorption and transmission loss.
Earmuff insert testing with pink noise to assess speech intelligibility and hearing protection.

Main Results:

The optimized metamaterial achieved a peak sound absorption coefficient of 1 at 2392 Hz.
Transmission loss of 10-11 dB was recorded between 3000-6400 Hz.
The earmuff insert facilitated speech passage while providing hearing protection against 95 dB pink noise.

Conclusions:

The proposed metamaterial design effectively filters sound, allowing speech communication while blocking harmful high-frequency noise.
This technology holds significant potential for improving passive noise cancellation earmuffs.
The design offers a dual benefit of enhanced communication and robust hearing protection in noisy environments.