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Vector intensity reconstructions in a volume surrounding a rigid spherical microphone array.

Earl G Williams1, Kazuhiro Takashima

  • 1Acoustics Division, Naval Research Laboratory, Washington, DC 20375, USA.

The Journal of the Acoustical Society of America
|February 9, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a novel technique for acoustic source localization using spherical microphone arrays. The method effectively images vector intensity to pinpoint noise sources in complex environments like vehicles.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Array Signal Processing

Background:

  • Acoustic intensity measurements are crucial for noise control.
  • Locating and quantifying acoustic sources in enclosed spaces presents significant challenges.

Purpose of the Study:

  • To develop and validate a technique for imaging vector intensity in the near field of a spherical microphone array.
  • To reconstruct volumetric vector intensity outside the sphere for source localization and quantification.

Main Methods:

  • Utilizing a spherical array of flush-mounted microphones on a rigid sphere.
  • Decomposing spatially measured pressure into Fourier harmonics for intensity reconstruction.
  • Applying Tikhonov regularization to address the ill-posed nature of the problem at low frequencies.

Main Results:

  • Successful imaging of vector intensity to locate and quantify exterior acoustic sources.
  • Demonstrated effectiveness in separating and imaging individual intensity fields of multiple uncorrelated sources.
  • Identified key source regions contributing to interior cabin noise in a practical automotive application.

Conclusions:

  • The developed technique is highly effective for noise control applications in interior spaces.
  • The method's performance is dependent on array design and frequency, with regularization needed below a cutoff frequency.
  • The technique offers a powerful tool for detailed acoustic source analysis and mapping.