A tunable acoustic metamaterial based on piezo buzzers and passive circuits. (31st October 2019)

• Record Type: Journal Article
• Authors: Zhu, Xiaohui; Qiao, Jing; Shao, Guangbin; Zhang, Guangyu; Li, Longqiu
• Is Part Of: Applied physics express. Volume 12:Number 12(2019)
• Publication Date: 2019-10-31
• Subjects: acoustic metamaterial -- tunable -- transfer matrix; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/1882-0786/ab4f4b
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: The limitation of current acoustic metamaterials with fixed properties or working at fixed frequency ranges once they are fabricated promotes the investigation of tunable metamaterials. Here, we propose a tunable acoustic metamaterial consisting of piezo buzzers and passive circuits. An analytic approach is developed to analyze the acoustic characteristics. Results show that the exterior passive circuit can induce a band gap at wavelengths much larger than the structure size. In this gap, the structure behaves as an effective medium with positive density and negative elastic modulus. Our work provides a feasible and simple approach to design adjustable acoustic filters or insulators.