Spatial resolution limits for the localization of noise sources using direct sound mapping

D. Fernandez Comesana, K. R. Holland, Efren Fernandez Grande

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Abstract

One of the main challenges arising from noise and vibration problems is how to identify the areas of a device, machine or structure that produce significant acoustic excitation, i.e. the localization of main noise sources. The direct visualization of sound, in particular sound intensity, has extensively been used for many years to locate sound sources. However, it is not yet well defined when two sources should be regarded as resolved by means of direct sound mapping. This paper derives the limits of the direct representation of sound pressure, particle velocity and sound intensity by exploring the relationship between spatial resolution, noise level and geometry. The proposed expressions are validated via simulations and experiments. It is shown that particle velocity mapping yields better results for identifying closely spaced sound sources than sound pressure or sound intensity, especially in the acoustic near-field. (C) 2016 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalJournal of Sound and Vibration
Volume375
Pages (from-to)53-62
ISSN0022-460x
DOIs
Publication statusPublished - 2016

Keywords

  • Structural acoustics and vibration
  • Acoustic noise, its effects and control
  • Measurement of acoustic variables
  • acoustic field
  • acoustic intensity measurement
  • acoustic noise
  • vibrations
  • noise source localization
  • direct sound mapping
  • spatial resolution limits
  • vibration
  • acoustic excitation
  • sound intensity
  • sound pressure
  • particle velocity
  • noise level
  • acoustic near-field
  • ACOUSTICS
  • ENGINEERING,
  • MECHANICS
  • FIELD
  • Direct sound mapping
  • Spatial resolution
  • Source localization

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