Conveners
A10.07 Micro-perforated and Helmholtz-type resonant absorbers: modelling and characterisation: S066
- Cedric Maury (Laboratory of Mechanics and Acoustics)
- Teresa Bravo (Spanish National Research Council)
A10.07 Micro-perforated and Helmholtz-type resonant absorbers: modelling and characterisation: S312
- Teresa Bravo (Spanish National Research Council)
- Cedric Maury (Laboratory of Mechanics and Acoustics)
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Teresa Bravo (Spanish National Research Council)09/09/2026, 08:40A10 Materials and Metamaterials
Designing new kind of absorbers to avoid the use of porous or fibrous materials due to the presence of mean flow in a duct is a challenging topic in the field of noise control. Lately, the development of metamaterials has provided new noise control perspectives for this issue. Traditional Acoustic Black Holes (ABHs) have been derived with closed-ended configurations to achieve broadband...
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Cedric Maury (Laboratory of Mechanics and Acoustics)09/09/2026, 09:00A10 Materials and Metamaterials
This study investigates the aero-acoustic robustness of rainbow trapping structures (RTSs) with straight and coiled cavities in fully opened and flow-compliant convergent configurations under a low-speed grazing flow. A transfer matrix model is developed to predict dissipation, reflection, and transmission loss (TL), and validated against finite element simulations of the Linearized...
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Yuchen Zhao (School of Architecture, Southeast Univ)09/09/2026, 09:20A10 Materials and Metamaterials
Broadband noise attenuation in ventilated duct systems remains challenging in the low-to-mid frequency range. This study proposes a ventilated acoustic black hole-micro-perforated panel (ABH-MPP) structure that combines axial geometric variation with sidewall micro-perforations to enhance thermoviscous dissipation. A one-dimensional transfer matrix model is developed and validated against...
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Dario Magliacano (Politecnico di Torino)09/09/2026, 09:40A10 Materials and Metamaterials
Low-frequency sound absorption in underwater environments remains challenging due to the large acoustic wavelengths and strong fluid–structure interaction effects. While Helmholtz-type resonators generally offer a promising route toward compact subwavelength solutions, achieving efficient dissipation mechanisms in water is non-trivial because of the suppressed role of visco-thermal losses...
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Lucie Gallerand (École de technologie supérieure)09/09/2026, 10:20A10 Materials and Metamaterials
Microperforated plates (MPP) are simple structures that can operate in hostile conditions and withstand high-amplitude mechanical excitations. MPPs have been shown to dissipate energy through thermoviscous interactions between shear fluid layers adjacent to solid perforation walls. In linear operation, the added damping is maximal at a characteristic frequency determined by the perforation...
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Felicitas Spörk (Graz University of Technology)09/09/2026, 10:40A10 Materials and Metamaterials
Microperforated plates are thin plates containing perforations in the submillimeter range. As the incident sound wave penetrates the material, energy is dissipated by friction in the perforations. In this study, the acoustic mechanisms in microperforated plates and foils are investigated. Due to different manufacturing techniques, the investigated materials exhibit different perforation...
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Hequn Min (School of Architecture, Southeast Univ)09/09/2026, 11:00A10 Materials and Metamaterials
Achieving high-quality building acoustic environments requires absorbers that combine frequency-tailored absorption, multifunctional performance, and compact form factors, while remaining amenable to predictive modeling and reliable characterization. Within this scope, this contribution reviews recent advances developed by the authors on micro-perforated panel absorbers (MPPAs) with...
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Jiahua Zhang (Test Division, Siemens Industry Software NV)09/09/2026, 11:20A10 Materials and Metamaterials
Conventional acoustic material design typically optimizes for physical parameters such as absorption coefficients or transmission loss, which do not always correlate with human perception of sound quality. This research proposes an alternative design methodology consisting of identifying material designs which satisfy a set of target psychoacoustic metrics, and is here applied to...
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