Optimized reactive silencers composed of closely-spaced elongated side-branch resonators
| Autor: | Michal Bednařík, Milan Cervenka, Jean-Philippe Groby |
|---|---|
| Přispěvatelé: | Faculty of Electrical Engineering [Prague] (FEL CTU), Czech Technical University in Prague (CTU), Laboratoire d'Acoustique de l'Université du Mans (LAUM), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM) |
| Rok vydání: | 2019 |
| Předmět: |
Cognitive science
Absorption (acoustics) Acoustics and Ultrasonics Transmission loss Acoustics 02 engineering and technology 01 natural sciences Waveguide (optics) Thermodynamic properties Resonator 0203 mechanical engineering Arts and Humanities (miscellaneous) 0103 physical sciences Acoustical properties Thermodynamic states and processes Finite-element analysis 010301 acoustics Coupling Physics Optical absorption Optimization algorithms Silencer Acoustic field Finite element method [PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph] 020303 mechanical engineering & transports Speed of sound Reflection (physics) Acoustic signal processing |
| Zdroj: | Journal of the Acoustical Society of America Journal of the Acoustical Society of America, Acoustical Society of America, 2019, 145 (4), pp.2210-2220. ⟨10.1121/1.5097167⟩ |
| ISSN: | 0001-4966 1520-8524 |
| Popis: | International audience; This paper reports a theoretical study of the sound propagation in a rectangular waveguide loaded by closely-spaced elongated side-branch resonators forming a simple low-frequency broadband reactive silencer. Semi-analytical calculations account for the evanescent modes both in the main waveguide and side-branch resonators and for the viscothermal losses in the silencer elements.Reasonable accuracy is maintained in the evaluation of transmission, reflection, and absorption coefficients, while the calculation time is reduced by a few hundred times in comparison with the finite element method. Therefore, the proposed method is particularly suitable for optimization procedure. The lengths of the individual equally spaced side-branch resonators are optimized by a heuristic evolutionary algorithm that maximizes the minimum transmission loss (TL) over a predefined frequency range. Numerical results indicate that the minimum TL of the optimized silencers is reduced due to the destructive effect of the evanescent coupling from the resonators of the nearest side-branches. In the opposite, the TL increases linearly with the number of the side-branch resonators. |
| Databáze: | OpenAIRE |
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