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Fixed Target Serial Data Collection at Diamond Light Source
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Sound field reconstruction using multipole equivalent source model with un-fixed source locations.

Yangfan Liu1, J Stuart Bolton1

  • 1Ray W. Herrick Laboratories, Purdue University, 177 South Russell Street, West Lafayette, Indiana 47907-2099, USA.

The Journal of the Acoustical Society of America
|December 8, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel equivalent source method (ESM) where sources dynamically adjust their positions. This dynamic approach significantly enhances sound field prediction accuracy, especially at higher frequencies.

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Area of Science:

  • Acoustics
  • Computational physics
  • Signal processing

Background:

  • Equivalent Source Methods (ESM) are crucial for acoustic modeling.
  • Existing ESM models typically use fixed source locations, limiting accuracy.

Purpose of the Study:

  • To develop and validate a new ESM with adaptable source locations.
  • To improve the accuracy of sound field prediction using ESM.

Main Methods:

  • A nonlinear optimization procedure was employed to determine optimal source locations based on measured sound field data.
  • Experiments were conducted using a loudspeaker cabinet and a microphone array.
  • Boundary element calculations using laser vibrometer data were used for comparison.

Main Results:

  • Allowing source components to move improved sound field representation in near and far fields.
  • Accuracy enhancement was particularly notable at high frequencies.
  • The proposed ESM accurately predicted sound pressure distribution on the source surface.

Conclusions:

  • The dynamic positioning of equivalent sources offers superior acoustic modeling capabilities.
  • This advanced ESM provides a more accurate prediction of sound fields compared to fixed-source models.
  • The method is validated for predicting surface sound pressure distributions.