Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Optimal microphone selection for aero-engine acoustic measurement

Li, Zepeng LU ; Qiao, Baijie ; Wen, Bi ; Chen, Xuefeng and Jakobsson, Andreas LU orcid (2024) In Aerospace Science and Technology 148.
Abstract

Acoustic testing is crucial in the aero-engine design process, providing valuable information about the sound field in terms of acoustic modes. The conventional use of a uniform sampling array limits the achievable resolution for a given number of sensors, necessitating the use of a large number of sensors to achieve high-resolution estimates. This limitation may be overcome using a non-uniform sensing array. In this work, we propose an optimal microphone selection scheme to determine which microphone placements that are preferable given the typically available a priori knowledge of the relevant acoustic modes. Using a weighted A-optimality criterion, we formulate the sensor selection problem as the one minimizing the expected variance... (More)

Acoustic testing is crucial in the aero-engine design process, providing valuable information about the sound field in terms of acoustic modes. The conventional use of a uniform sampling array limits the achievable resolution for a given number of sensors, necessitating the use of a large number of sensors to achieve high-resolution estimates. This limitation may be overcome using a non-uniform sensing array. In this work, we propose an optimal microphone selection scheme to determine which microphone placements that are preferable given the typically available a priori knowledge of the relevant acoustic modes. Using a weighted A-optimality criterion, we formulate the sensor selection problem as the one minimizing the expected variance of the resulting parameter estimates. Using both numerical and measured data sets, we illustrate how the proposed scheme allows for improved performance as compared to random and uniform sensor placement schemes.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Acoustic mode analysis, Aero-engine measurements, Array design optimization, Cramér-Rao lower bound, Estimation theory
in
Aerospace Science and Technology
volume
148
article number
109079
publisher
Elsevier Masson SAS
external identifiers
  • scopus:85189042796
ISSN
1270-9638
DOI
10.1016/j.ast.2024.109079
language
English
LU publication?
yes
id
f6e4e29a-e97e-4652-b7d0-e971eacd2a0f
date added to LUP
2024-04-22 13:11:03
date last changed
2024-04-22 13:11:50
@article{f6e4e29a-e97e-4652-b7d0-e971eacd2a0f,
  abstract     = {{<p>Acoustic testing is crucial in the aero-engine design process, providing valuable information about the sound field in terms of acoustic modes. The conventional use of a uniform sampling array limits the achievable resolution for a given number of sensors, necessitating the use of a large number of sensors to achieve high-resolution estimates. This limitation may be overcome using a non-uniform sensing array. In this work, we propose an optimal microphone selection scheme to determine which microphone placements that are preferable given the typically available a priori knowledge of the relevant acoustic modes. Using a weighted A-optimality criterion, we formulate the sensor selection problem as the one minimizing the expected variance of the resulting parameter estimates. Using both numerical and measured data sets, we illustrate how the proposed scheme allows for improved performance as compared to random and uniform sensor placement schemes.</p>}},
  author       = {{Li, Zepeng and Qiao, Baijie and Wen, Bi and Chen, Xuefeng and Jakobsson, Andreas}},
  issn         = {{1270-9638}},
  keywords     = {{Acoustic mode analysis; Aero-engine measurements; Array design optimization; Cramér-Rao lower bound; Estimation theory}},
  language     = {{eng}},
  publisher    = {{Elsevier Masson SAS}},
  series       = {{Aerospace Science and Technology}},
  title        = {{Optimal microphone selection for aero-engine acoustic measurement}},
  url          = {{http://dx.doi.org/10.1016/j.ast.2024.109079}},
  doi          = {{10.1016/j.ast.2024.109079}},
  volume       = {{148}},
  year         = {{2024}},
}