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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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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, 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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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Active structural acoustic illusions.

Daniel Eggler1, Nicole Kessissoglou2

  • 1School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, 2052, Australia. d.eggler@unsw.edu.au.

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Summary
This summary is machine-generated.

We demonstrate active structural acoustic illusion by manipulating vibrations in an elastic body. This technique misrepresents exterior acoustic objects

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Area of Science:

  • Acoustics and structural mechanics.
  • Vibration manipulation and acoustic field generation.

Background:

  • Understanding acoustic scattering is crucial for object detection and characterization.
  • Current methods often rely on passive properties of objects.

Purpose of the Study:

  • To present a novel method for generating acoustic illusions using active structural manipulation.
  • To demonstrate the ability to misrepresent object properties like size, number, and location through controlled vibrations.

Main Methods:

  • Utilizing an elastic cylindrical shell as the experimental model.
  • Actively modifying the radial motion of the shell at its cavity resonance frequencies.
  • Applying localized mechanical forces to control vibrations.

Main Results:

  • Successfully generated acoustic illusions that alter the perception of exterior acoustic objects.
  • Demonstrated that the illusions can mimic the scattered acoustic fields of different rigid cylinders.
  • Showcased the ability to misrepresent object nature, size, and number.

Conclusions:

  • Active structural acoustic illusion is a viable technique for manipulating acoustic perception.
  • This method offers a new paradigm for controlling acoustic fields and creating artificial acoustic environments.
  • The findings have potential applications in areas requiring acoustic cloaking or targeted acoustic manipulation.