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Optimized sound diffusers based on sonic crystals using a multiobjective evolutionary algorithm.

J Redondo1, J V Sánchez-Pérez1, X Blasco1

  • 1Universitat Politècnica de València, Camino de Vera S/N, 46022 Valencia, Spain.

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Sonic crystals offer a thin alternative to traditional diffusers for scattering low frequencies. Multiobjective evolutionary algorithms significantly enhance their diffusion bandwidth for improved acoustic performance.

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Area of Science:

  • Acoustics
  • Materials Science
  • Computational Physics

Background:

  • Sonic crystals show promise as thin acoustic diffusers for low frequencies, overcoming limitations of conventional thick structures.
  • Current sonic crystal designs exhibit narrow bandwidth performance, limiting their effectiveness across the desired low-frequency range.

Purpose of the Study:

  • To broaden the operational bandwidth of sonic crystals for low-frequency sound scattering using multiobjective evolutionary algorithms.
  • To investigate the impact of various cost functions on optimization flexibility and identify potential challenges.
  • To assess the robustness of optimized sonic crystal designs and introduce a selection parameter.

Main Methods:

  • Application of multiobjective evolutionary algorithms to optimize sonic crystal structures.
  • Exploration of diverse cost functions to guide the optimization process.
  • Analysis of design robustness and introduction of a parameter for candidate selection.

Main Results:

  • Demonstrated significant enhancement in sound diffusion bandwidth across the entire low-frequency spectrum.
  • Illustrated the flexibility of multiobjective optimization and highlighted issues with specific cost functions.
  • Presented a robustness study for optimized diffusers, including a selection parameter.

Conclusions:

  • Multiobjective evolutionary algorithms effectively extend the bandwidth of sonic crystals for low-frequency sound diffusion.
  • The choice of cost functions critically influences optimization outcomes and design robustness.
  • Optimized sonic crystals offer a significant improvement over conventional designs, with a robust method for selecting the best candidates.