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Application de l'approche de la réponse impulsionnelle à la modélisation du rayonnement de transducteurs acoustiques de structure arbitraire

Abstract : The work done in this thesis has led to the development of simulation software "DREAM" to calculate the sound field radiated by transducers of flat surfaces and quasi-plane whose openings can be structured in an almost arbitrary. It takes into account all the characteristic parameters of a transducer or transducer array (geometry, apodization, focusing, scanning, excitement, ... etc..). The analysis of the behavior of the transducer in the near to far field and the determination of antenna directivity can be made for both broadband and harmonic excitations. The original options "Arbitrary Matrix" and "3D structure" used to define an array transducer structure almost arbitrary. The calculation program is purely digital, it uses the formalism of the impulse response and it operates directly in the time domain. The calculation procedure, based on the approach of "discrete representation", generates the desired solution in the same manner as the acoustic field is created physically by a transducer. Thus, a solution exists for each case causal achievable in practice. Initially, the program validation was performed using numerous examples and tests demonstrated the reliability of the results obtained. In a second step, it was applied to four different studies including analysis of a transducer array designed for sonar, analysis and comparison of radiation of two transducers, circular geometric and electronic focus, the study of an active noise control system, the study and comparison "geometric - electronic" multi-element transducers of convex and concave cylindrical shape. Regarding the case of active noise control system was used to study its experimental validation of the method of calculation by comparing the results of the latter with measurements. Overall, the potential of the software allow DREAM to create a large majority of studies in which individual authors have already developed their own method of calculation
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https://tel.archives-ouvertes.fr/tel-00687979
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Submitted on : Monday, April 16, 2012 - 11:30:01 AM
Last modification on : Wednesday, March 23, 2022 - 3:50:25 PM
Long-term archiving on: : Tuesday, July 17, 2012 - 2:27:30 AM

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  • HAL Id : tel-00687979, version 1

Citation

Khalid Sbai. Application de l'approche de la réponse impulsionnelle à la modélisation du rayonnement de transducteurs acoustiques de structure arbitraire. Acoustique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambresis, 1996. Français. ⟨NNT : 1996VALE0023⟩. ⟨tel-00687979⟩

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