4.5 Article

A lightweight metastructure for simultaneous low-frequency broadband sound absorption and vibration isolation

Journal

JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 153, Issue 1, Pages 96-104

Publisher

ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/10.0016824

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We study a lightweight metastructure that can simultaneously reduce vibration and noise in a broad low-frequency range through theoretical, numerical, and experimental methods. By introducing spiral slits and micro-perforations in the panel and core plate, respectively, we achieve broadband low-frequency sound absorption and vibration isolation. This multifunctional metastructure provides a new route to design lightweight load-bearing structures with noise and vibration reduction performance for potential applications in aerospace engineering and transportation vehicles.
We theoretically, numerically, and experimentally study a lightweight metastructure that can simultaneously reduce vibration and noise in a broad low-frequency range. We introduce spiral slits and micro-perforations in the panel and core plate of a face-centered cubic sandwich structure, respectively. A bottom-up acoustic impedance theory is developed to describe the impedance of a single unit cell. Broadband low-frequency sound absorption is achieved for a 3 x 3 supercell via reinforcement learning optimization. The resonant coupling of the upper spiral panel and the lower panel of the unit can form a wide hybridized bandgap for flexural waves, which is further validated for vibration isolation with a one-dimensional supercell. The proposed multifunctional metastructure provides a new route to design lightweight load-bearing structures with noise and vibration reduction performance for potential applications such as aerospace engineering and transportation vehicles, among others.

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