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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2017.tde-04042017-093331
Document
Author
Full name
Érica Regina Filletti Nascimento
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2002
Supervisor
Committee
Seleghim Júnior, Paulo (President)
Bannwart, Antonio Carlos
Fontes, Sergio Rodrigues
Title in Portuguese
Estudo sobre a utilização de tomografia acústica para a reconstrução de campos internos de temperatura
Keywords in Portuguese
Problema inverso
Sensibilidade
Tomografia acústica
Abstract in Portuguese
Esta dissertação apresenta um estudo sobre a utilização de tomografia acústica para reconstruir a distribuição interna de temperaturas de um corpo ou escoamento. Para tanto, o problema inverso foi modelado matematicamente a partir da equação de propagação acústica e de um funcional de erro quantificando a sensibilidade dos perfis de pressão acústica externa relativamente a variações na distribuição interna de impedância acústica. Simulações numéricas foram realizadas em um modelo de um problema real, tendo sido testadas duas técnicas de excitação, a clássica tipo Dirac e uma estratégia otimizada segundo um perfil triangular.
Title in English
Study about the utilization of acoustic tomography to reconstruct the internal temperature distribution
Keywords in English
Acoustic tomography
Inverse problem
Sensitivity
Abstract in English
This work presents a study about the utilization of acoustic tomography to reconstruct the internal temperature distribution of a body or a flow. To do this, the inverse problem was mathematically modeled from the acoustic propagation equation and a error functional quantifying the sensitivity of external acoustic pressure profile according to changes in the internal acoustic impedance distribution. Numerical simulations were done in a real problem model, two excitation techniques were tested, the classical Dirac type and a optimized strategy with a triangular profile.
 
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Publishing Date
2017-04-04
 
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