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Novel design for acoustic silencers for ducts with flow based on the bound states in the continuum

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Abstract

The concept of bound states in the continuum and leaky resonances is utilized in the design of a reactive silencer that can effectively suppress significant spectral lines while maintaining a low-pressure drop within the flow duct and does not require additional installation space. By adjusting the geometrical parameters of thin plates that are embedded in a waveguide, quasi-bound states (or leaky resonances) can be achieved. An optimization algorithm is employed to fine-tune these parameters, and this process is illustrated through two specific examples. The resulting design is validated through numerical simulations that account for the effects of low Mach number flow. The investigations showed that it is possible to design a spectral silencer with low-pressure drop based on the chosen approach. By combining several leaky resonances, stopbands were created with a transmission loss of up to 17 dB in a frequency range of 10 Hz.

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Acknowledgements

This work was supported by the Grant Agency of the Czech Republic (GACR) Grant No. 22-33896S.

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Author notes

  1. Antonín Krpenský, Michal Bednar̆ík and Felix Czwielong have contributed equally to this work.

Authors and Affiliations

  1. Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27, Prague, Czech Republic

    Viktor Hruška, Antonín Krpenský & Michal Bednar̆ík

  2. Institute for Fluid Mechanics, Friedrich-Alexander-University Erlangen-Nuernberg, Cauerstraße 4, 91058, Erlangen, Germany

    Felix Czwielong

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  1. Viktor Hruška
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  2. Antonín Krpenský
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  3. Michal Bednar̆ík
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Contributions

VH, AK conceptualized the study; VH, AK, FC helped in methodology; VH, FC were involved in writing—original draft preparation; MB was involved in writing—review and editing, funding acquisition and supervision.

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Correspondence to Viktor Hruška.

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Hruška, V., Krpenský, A., Bednar̆ík, M. et al. Novel design for acoustic silencers for ducts with flow based on the bound states in the continuum. Arch Appl Mech 93, 4517–4526 (2023). https://doi.org/10.1007/s00419-023-02508-y

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