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Sound as Pressure Waves

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
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Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...

Sound Waves

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Updated: Sep 6, 2025

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Moth wings as sound absorber metasurface.

Thomas R Neil¹, Zhiyuan Shen¹, Daniel Robert¹

¹School of Biological Sciences, University of Bristol, Bristol, UK.

Proceedings. Mathematical, Physical, and Engineering Sciences

|June 27, 2022

Summary

Moth wings act as natural, deep-subwavelength sound absorbers, reducing noise reflection by up to 87%. Their unique scale structure and orientation are key to this bioinspired sound mitigation capability.

Keywords:

acoustic metamaterial bioinspired metamaterials biological sound absorber deep-subwavelength

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Area of Science:

Acoustics
Materials Science
Bioinspired Engineering

Background:

Metasurface absorbers aim for deep-subwavelength performance in noise control, a challenging technological goal.
Natural structures like moth wings exhibit sound absorption properties due to their complex surface features.

Purpose of the Study:

To investigate the potential of moth wings as natural metasurface sound absorbers.
To quantify their sound absorption efficiency and understand the role of their unique structures.

Main Methods:

Experimental measurement of sound reflection reduction by moth wings on acoustically reflective substrates.
Analysis of the effect of scale removal and wing orientation on absorptive performance.
Numerical simulations to explore the influence of air gaps and scale presence.

Main Results:

Moth wings achieved up to 87% sound reflection reduction at 20 kHz, with a thickness to wavelength ratio as low as 1/50.
Scale removal and reversed wing orientation significantly altered sound absorption, highlighting the importance of scales and air gaps.
Numerical simulations confirmed the critical role of scales and the underlying air gap in absorption.

Conclusions:

Moth wings function as effective deep-subwavelength sound-absorbing metasurfaces.
The findings open avenues for bioinspired, high-performance acoustic mitigation solutions.
The specific arrangement of scales and the air gap are crucial for the observed sound absorption properties.