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Related Concept Videos

Sound as Pressure Waves01:17

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.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
Sound Waves: Interference00:53

Sound Waves: Interference

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...
Perception of Sound Waves01:01

Perception of Sound Waves

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.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same frequency...
Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
Sound Intensity00:58

Sound Intensity

The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the emitted...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Characterizing Dissipative Elastic Metamaterials Produced by Additive Manufacturing
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Published on: June 28, 2024

Multistable mechanical metamaterials for sound absorption.

Jianhao Man1,2, Bo Cao3, Liang Yu3

  • 1Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, China. xiaojun_tan1@163.com.

Materials Horizons
|May 14, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a tunable acoustic metamaterial using multistable structures for effective low-frequency, broadband sound absorption. The innovative design achieves tunable near-perfect sound absorption, offering robust noise control solutions.

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Area of Science:

  • Acoustics
  • Materials Science
  • Metamaterials

Background:

  • Achieving high sound absorption at low frequencies and broad bandwidths is a significant challenge in acoustic metamaterial design.
  • Existing solutions often lack tunability or structural compactness.

Purpose of the Study:

  • To propose and demonstrate a tunable acoustic metamaterial capable of low-frequency broadband sound absorption.
  • To leverage multistability for enhanced dissipation mechanisms and robust tunability.

Main Methods:

  • Integration of multistable thin-walled tube (MTWT) units with embedded neck structures to create Helmholtz-type resonators.
  • Exploitation of multistability to induce acoustic soft boundaries and enhance thermoviscous dissipation.
  • Experimental and simulation validation of the proposed metamaterial's acoustic performance.

Main Results:

  • The metamaterial achieves near-perfect sound absorption between 436-1141 Hz.
  • Continuous tunability of the absorption coefficient from 0 to 1 within the target frequency range.
  • Demonstrated robust and energy-efficient tunability through discrete, self-sustained geometric configurations.

Conclusions:

  • The proposed multistable acoustic metamaterial offers a novel strategy for multi-dimensional tunability in sound absorption.
  • This design shows significant potential for applications in low-frequency broadband noise control.
  • The synergistic combination of dissipation mechanisms and tunable states provides a flexible solution for acoustic challenges.