Thin-layer low-frequency underwater sound insulation metamaterial

US12387705B2 · kind B2 · utility

Assignee

• NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY · CN

Inventors

• Honggang Zhao · Changsha, CN
• Yang Wang · Chandler, US
• Chao-Hsiang Wang · Lo Wu, CN
• Junhui Cao · Changsha, CN
• Jihong Wen · Hunan, CN

Key dates

• Filing date: Apr 21, 2022
• Grant date: Aug 12, 2025
• Expiry date: Jun 3, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G10K2200/11
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

The present disclosure provides a thin-layer low-frequency underwater sound insulation metamaterial, including two cover plates and a sound insulation layer. The sound insulation layer is composed of sound insulation components arranged in an array periodically. The sound insulation components each include a sound insulation unit and four connecting units. The sound insulation unit is of a hollow rectangular column structure. The four connecting units are arranged at four corners of the sound insulation unit. Every two adjacent sound insulation units are connected through the connecting units. A long side wall of the sound insulation unit and the corresponding cover plate have an included angle of 0-90°. The metamaterial can obtain a smaller equivalent acoustic impedance in propagation direction of acoustic waves, and compared with a sound insulation material of a square honeycomb structure with the same thickness, the metamaterial has greatly improved sound insulation performance.