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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

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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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Sound Waves: Interference00:53

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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...
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Sound Intensity00:58

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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...
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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Sound Waves: Resonance01:14

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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...
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Perception of Sound Waves01:01

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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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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Ultra-sparse near-perfect sound absorbers.

Jun Ji1, Junfei Li2, Steven A Cummer2

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Researchers achieved near-perfect sound absorption using sparse monopole-dipole resonators. This breakthrough overcomes the traditional trade-off, offering significant potential for noise control applications.

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Area of Science:

  • Acoustics
  • Wave Physics
  • Materials Science

Background:

  • Wave physics dictates a trade-off between absorber array sparseness and sound absorption efficiency.
  • Traditional acoustic absorbers often require dense configurations, limiting practical applications.

Purpose of the Study:

  • To demonstrate near-perfect sound absorption (99%) using a sparse array of monopole-dipole resonators.
  • To investigate the physical conditions required for achieving critical coupling in such resonator systems.
  • To explore the implications for noise control and electromagnetic wave absorption.

Main Methods:

  • Frequency domain simulations to analyze acoustic performance.
  • Eigenfrequency simulations to determine resonant modes.
  • Coupled mode theory to elucidate the underlying physics of critical coupling.

Main Results:

  • Achieved 99% sound absorption with a sparse array of monopole-dipole resonators.
  • Demonstrated that near-perfect absorption occurs when the spatial period is near one working wavelength (95% of wavelength).
  • Identified critical coupling of degenerate monopole-dipole resonators as the condition for perfect absorption.

Conclusions:

  • Sparse resonator arrays can achieve high sound absorption, overcoming previous limitations.
  • The findings have direct applications in noise control, particularly in systems with airflow.
  • The principles demonstrated may also apply to the design of electromagnetic wave absorbers.