Enhanced absorption with multiple quadratically tapered elastic wedges of different lengths terminating a uniform beam

Karlos, Angelis; Hook, Kristian; Cheer, Jordan

doi:10.1016/j.jsv.2022.116981

Cited by 14 publications

(1 citation statement)

References 22 publications

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“…A summary of some of these works can be found in a review by Pelat et al (2020). While most studies on structural acoustic black holes focus on their wave absorption properties (Chen et al, 2023;Deng et al, 2023;Deng et al, 2019;He et al, 2023;Karlos et al, 2022;Liu et al, 2022;Ouisse et al, 2019;Sheng et al, 2023), a few have explored alternative applications, including weak signal sensing (Zhao et al, 2022), wave focusing and acoustic lensing (Deng et al, 2021b;Tang and Cheng, 2019;Zhao et al, 2023;Zhu and Semperlotti, 2017), energy harvesting (Deng et al, 2021a;Ji et al, 2019;Li et al, 2022;Maugan et al, 2019;Zhao et al, 2014), and even ultrasonic tweezers (Liu et al, 2023). Despite the diverse range of applications, all these studies harness the wave-focusing property of acoustic black holes to achieve their respective objectives.…”

Section: Introductionmentioning

confidence: 99%

Topology optimization of a waveguide acoustic black hole for enhanced wave focusing

Mousavi,

Berggren,

Hägg

et al. 2024

The Journal of the Acoustical Society of America

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The waveguide acoustic black hole (WAB) effect is a promising approach for controlling wave propagation in various applications, especially for attenuating sound waves. While the wave-focusing effect of structural acoustic black holes has found widespread applications, the classical ribbed design of waveguide acoustic black holes (WABs) acts more as a resonance absorber than a true wave-focusing device. In this study, we employ a computational design optimization approach to achieve a conceptual design of a WAB with enhanced wave-focusing properties. We investigate the influence of viscothermal boundary losses on the optimization process by formulating two distinct cases: one neglecting viscothermal losses and the other incorporating these losses using a recently developed material distribution topology optimization technique. We compare the performance of optimized designs in these two cases with that of the classical ribbed design. Simulations using linearized compressible Navier–Stokes equations are conducted to evaluate the wave-focusing performance of these different designs. The results reveal that considering viscothermal losses in the design optimization process leads to superior wave-focusing capabilities, highlighting the significance of incorporating these losses in the design approach. This study contributes to the advancement of WAB design and opens up new possibilities for its applications in various fields.

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