An ultralight phononic beam with a broad low-frequency band gap using the complex lattice of acoustic black holes. (1st July 2019)

• Record Type: Journal Article
• Authors: Zhang, Yanni; Chen, Kean; Zhou, Shengxi; Wei, Zhengyu
• Is Part Of: Applied physics express. Volume 12:Number 7(2019)
• Publication Date: 2019-07-01
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/1882-0786/ab2a6d
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: An ultralight phononic beam (PB) using the complex lattice of acoustic black holes (ABHs) is designed for producing broad low-frequency band gaps (BGs). Its unit-cell contains in-series outward-and-inward-curved ABHs and is over one-third lighter than its simple-lattice counterparts. Ultrawide low-frequency BGs are achieved due to multi-modal and complex-modal behaviors and the reduced structure stiffness by extra ABH introduced in the unit-cell. The BGs are tunable to lower and broader frequencies by adjusting the residue thickness of each ABH. Furthermore, broad low-frequency vibration attenuations of the finite-size PB are investigated and experimentally verified. Our approach allows broadband low-frequency vibration control by using an ultralight structure.