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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...
Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave propagating...
Intensity and Pressure of Sound Waves01:05

Intensity and Pressure of Sound Waves

The intensity of sound waves can be related to displacement and pressure amplitudes by using their wave expressions and the definition of intensity. The critical step to achieve this is to write the power delivered by the particles on the wave as the product of force and velocity and simplify the force per unit area as the pressure. The velocity of the medium's particles can be derived from the displacement.
Unlike the time average of a sinusoidal term, which is zero since it is positive and...
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...
Application of Linearization and Approximation01:29

Application of Linearization and Approximation

A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...
Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

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Related Experiment Video

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The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe
08:53

The Measurement of Unsteady Surface Pressure Using a Remote Microphone Probe

Published on: December 3, 2016

Methods for reconstructing acoustic quantities based on acoustic pressure measurements.

Sean F Wu1

  • 1Department of Mechanical Engineering, Wayne State University, Detroit, Michigan 48202, USA.

The Journal of the Acoustical Society of America
|December 3, 2008
PubMed
Summary

This study reviews acoustic imaging methods, including near-field acoustical holography (NAH), for reconstructing sound from pressure measurements. It highlights NAH

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Area of Science:

  • Acoustics and Vibration Analysis
  • Signal Processing
  • Structural Dynamics

Background:

  • Acoustic imaging methods reconstruct sound fields from pressure measurements.
  • Near-field acoustical holography (NAH) is a prominent technique.
  • Understanding structural vibrations and sound radiation is crucial for noise control.

Purpose of the Study:

  • To provide an overview of acoustic imaging methods developed over three decades.
  • To compare the advantages and limitations of different reconstruction techniques.
  • To discuss the need for further advancements in noise and vibration analysis.

Main Methods:

  • Review of acoustic imaging techniques based on near-field acoustic pressure measurements.
  • Focus on Fourier transform-based near-field acoustical holography (NAH).
  • Discussion of alternative methods for 3D acoustic reconstruction on arbitrary surfaces.

Main Results:

  • Fourier transform-based NAH provides a wave number spectrum, enabling visualization of structural waves.
  • Other methods reconstruct acoustic quantities in 3D space but lack wave number spectrum information.
  • A critical difference exists in the ability to visualize structural waves, impacting understanding of vibration-sound relationships.

Conclusions:

  • Near-field acoustical holography (NAH) offers unique insights into structural wave phenomena.
  • Further development is needed to fully analyze the root causes of noise and vibration.
  • Comparing different acoustic imaging methods is essential for advancing noise and vibration control strategies.