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Theses

Synthèse d'un champ acoustique avec contraste spatial élevé

Abstract : The goal of this thesis is the design of a transportable speaker system, able to generate a predefined and focused sound field with a high spatial contrast. This system has eventually to allow carrying out different types of studies, for example acoustic transmission loss tests or vibration tests in non-anechoic conditions. The minimization of the number of driven channels and the number of transducers is one of the main goals of the work. The choice of the number of sources and the selection of their optimal positions in order to generate a target acoustic field has no trivial solution. To answer this question, the proposed method is based on the decomposition of the source radiation into a series of independent orthogonal functions (the “radiation modes”), constructed numerically via a singular value decomposition of the impedance matrix. By filtering the evanescent terms, the far field can be reconstructed using a small number of terms. In addition, the method allows the estimation of an efficient flow distribution to generate the target field. With the proposed method having been scarcely studied in the literature, the first part of the thesis is devoted to the problem of the experimental validation of the direct method and the study of the main parameters that are influencing the result. The work done in this context was shared with the “audio” community, and a new alternative method for characterizing acoustic sources was proposed, that can be used in anechoic conditions as well as in situ. The problem of sources positioning in order to synthesize a predefined and focused sound field is discussed in the second part of the thesis. The radiation modes method is combined with control techniques that promote an acoustic contrast. A first prototype was designed basing on this approach, and is the subject of an experimental characterization.
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https://tel.archives-ouvertes.fr/tel-01815464
Contributor : Maryna Sanalatii <>
Submitted on : Thursday, June 14, 2018 - 10:37:53 AM
Last modification on : Tuesday, March 31, 2020 - 3:21:13 PM
Long-term archiving on: : Monday, September 17, 2018 - 12:26:27 PM

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  • HAL Id : tel-01815464, version 1

Citation

Maryna Sanalatii. Synthèse d'un champ acoustique avec contraste spatial élevé. Acoustique [physics.class-ph]. Le Mans Université - LAUM - Le Mans (72), 2018. Français. ⟨tel-01815464⟩

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