Extraordinary acoustic absorption induced by hybrid resonance and electrical energy generation from sound by hybrid resonant metasurface

US9711129B2 · kind B2 · utility

Assignee

• The Hong Kong University of Science and Technology

Inventors

• Ping Sheng · Hong Kong, CN
• Zhiyu Yang · Dublin, US
• Guancong Ma · Hong Kong, CN
• Min Yang · Sherwood Park, CA
• Songwen Xiao · Hong Kong, CN

Key dates

• Filing date: Jul 17, 2014
• Grant date: Jul 18, 2017
• Expiry date: Jul 17, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K35/00
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

A sound absorbing metamaterial comprises an acoustic impedance-matched surface configured to minimize reflection from an incident acoustic wave. The surface is comprised of an elastic or flexible membrane and a substantially rigid mass mounted on the membrane. A relatively solid surface is provided as a reflective surface and is positioned behind the membrane. The reflective surface is separated by a predetermined distance from the elastic or flexible membrane and forms a fluid space between the membrane and the solid surface. The mass mounted on the membrane, in combination with the elastic membrane establish a plurality of eigenfrequencies.