Publication detail

Comparison of patch acoustic holography methods for confined space

HAVRÁNEK, Z. BENEŠ, P. KLUSÁČEK, S.

Original Title

Comparison of patch acoustic holography methods for confined space

English Title

Comparison of patch acoustic holography methods for confined space

Type

conference paper

Language

en

Original Abstract

Localization and characterization of noise and vibration sources through measurement of sound fields radiated from vibrating structures plays an important role in vibration diagnostics. Sound pressure field measured in closed distance to the source with a microphone array is then inversely processed with the suitable near-field acoustic holography method to obtain the estimation of sound field very near the identified source surface. Several restrictions apply when measurement is performed in non-anechoic conditions and with the array smaller than the examined source. In these cases patch holography methods with sound field separation technique should be used. The Equivalent Source Method (ESM), Statistically Optimized Near-field Acoustical Holography (SONAH) and iteratively enhanced Fourier transformation based procedure are examples of such methods. In this paper an extensive comparison of these source identification methods has been carried out while other disturbing sources affect the acquired data. Experimental evaluation of the methods has been performed in ideal anechoic conditions and further in disturbing environment. Real measurement data has been obtained with double layer planar rectangular microphone array with MEMS transducers and the results of principal source identification accuracy for all methods have been presented. Some practical aspects of applicability of each method are also discussed.

English abstract

Localization and characterization of noise and vibration sources through measurement of sound fields radiated from vibrating structures plays an important role in vibration diagnostics. Sound pressure field measured in closed distance to the source with a microphone array is then inversely processed with the suitable near-field acoustic holography method to obtain the estimation of sound field very near the identified source surface. Several restrictions apply when measurement is performed in non-anechoic conditions and with the array smaller than the examined source. In these cases patch holography methods with sound field separation technique should be used. The Equivalent Source Method (ESM), Statistically Optimized Near-field Acoustical Holography (SONAH) and iteratively enhanced Fourier transformation based procedure are examples of such methods. In this paper an extensive comparison of these source identification methods has been carried out while other disturbing sources affect the acquired data. Experimental evaluation of the methods has been performed in ideal anechoic conditions and further in disturbing environment. Real measurement data has been obtained with double layer planar rectangular microphone array with MEMS transducers and the results of principal source identification accuracy for all methods have been presented. Some practical aspects of applicability of each method are also discussed.

Keywords

acoustic holography, microphone arrays, confined space

RIV year

2014

Released

16.11.2014

Publisher

The Australian Acoustical Society

Location

Melbourne, Victoria, Austrálie

ISBN

978-0-909882-04-4

Book

Proceedings of 43rd International Congress on Noise Control Engineering

Pages from

1

Pages to

10

Pages count

10

Documents

BibTex


@inproceedings{BUT110986,
  author="Zdeněk {Havránek} and Petr {Beneš} and Stanislav {Klusáček}",
  title="Comparison of patch acoustic holography methods for confined space",
  annote="Localization and characterization of noise and vibration sources through measurement of sound fields radiated from vibrating structures plays an important role in vibration diagnostics. Sound pressure field measured in closed distance to the source with a microphone array is then inversely processed with the suitable near-field acoustic holography method to obtain the estimation of sound field very near the identified source surface. Several restrictions apply when measurement is performed in non-anechoic conditions and with the array smaller than the examined source. In these cases patch holography methods with sound field separation technique should be used. The Equivalent Source Method (ESM), Statistically Optimized Near-field Acoustical Holography (SONAH) and iteratively enhanced Fourier transformation based procedure are examples of such methods. In this paper an extensive comparison of these source identification methods has been carried out while other disturbing sources affect the acquired data. Experimental evaluation of the methods has been performed in ideal anechoic conditions and further in disturbing environment. Real measurement data has been obtained with double layer planar rectangular microphone array with MEMS transducers and the results of principal source identification accuracy for all methods have been presented. Some practical aspects of applicability of each method are also discussed.",
  address="The Australian Acoustical Society",
  booktitle="Proceedings of 43rd International Congress on Noise Control Engineering",
  chapter="110986",
  howpublished="electronic, physical medium",
  institution="The Australian Acoustical Society",
  year="2014",
  month="november",
  pages="1--10",
  publisher="The Australian Acoustical Society",
  type="conference paper"
}