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Master's Dissertation
DOI
10.11606/D.3.2011.tde-13072011-162109
Document
Author
Full name
Flávio Guimarães Caduda
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2011
Supervisor
Committee
Baccalá, Luiz Antonio (President)
Gerges, Samir Nagi Yousri
Meneghini, Julio Romano
Title in Portuguese
Método de alta resolução em imageamento acústico.
Keywords in Portuguese
Aeroacústica
Array ESPRIT
Beamforming acústica
Imageamento acústico
Abstract in Portuguese
O estudo concentra-se na localização de fontes de ruídos em aeroacústica, através do processamento digital de sinais. O objetivo em aeroacústica é localizar fontes de ruído em estruturas aerodinâmicas (e.g.: aerofólios, slats, flaps e trens de pouso), motores e turbinas. Isto se faz possível utilizando arranjos de microfones, ou simplesmente arrays, cujos sinais são processados para localizar as fontes. Ao utilizar o beamforming clássico para processar os sinais vindos do array, este é incapaz de localizar as fontes de ruído de forma satisfatória. O 2D-ESPRIT é um método de alta resolução que é apresentado como alternativa. Nas simulações, é possível perceber que o 2D-ESPRIT tem melhor desempenho que o beamforming clássico, conseguindo localizar fontes próximas com arrays quadrados e com um número reduzido de amostras de sinal.
Title in English
High resolution method for acoustic imaging.
Keywords in English
Acoustic imaging
Aeroacoustics beamforming
Array ESPRIT
Abstract in English
This study focuses on locating sources of noise in aeroacoustics, through digital signal processing. An objective in aeroacoustics is to locate sources of noise in aerodynamic structures (e.g.: airfoils, slats, flaps and landing gears), engines and fans. This is possible using microphone arrays, whose signals are processed to locate the sources. Using classical beamforming as the processing scheme for these signals, it is shown that it is incapable of locating sources satisfactorily in many of the practical scenarios. 2D-ESPRIT is a high resolution processing scheme that is presented as an alternative. Simulations show that 2D-ESPRIT outperfoms classical beamforming, locating closely positioned sources with the simple URA and with a reduced number of signal samples.
 
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Publishing Date
2011-08-01
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • CADUDA, F. G., and BACCALÁ, L. A. High Resolution Acoustic Source Localization for Aeroacoustic Arrays. In High Resolution Acoustic Source Localization for Aeroacoustic Arrays, Portland, OR, 2011. 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference) Proceedings 2011. : AIAA, 2011.
All rights of the thesis/dissertation are from the authors
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