TY - GEN
T1 - Resonance mode analysis of finite plate strip with acoustic black holes: the gap between bandgap and attenuation band
AU - Han, Bing
AU - Ji, Hongli
AU - Qiu, Jinhao
AU - Cheng, Li
N1 - Funding Information:
This work is partially supported by the National Key Research and Development Program of China (No. 2021YFB3400100), the National Natural Science Foundation of China (Nos. 52022039), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (Nanjing University of Aeronautics and astronautics, Nos. MCMS-I-0521G03) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
Publisher Copyright:
© 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.
PY - 2022/8
Y1 - 2022/8
N2 - Acoustic Black Hole (ABH) lattice structures show promise for achieving broadband bandgap in lightweight design. Existing ABH lattice research usually assumes that the bandgaps of infinite periodic structure are roughly the same as the attenuation band with strong energy attenuation in the finite counterpart. This work is concerned with comparison of the real attenuation bandwidth of finite ABH periodic structures and the bandgap of the infinite counterpart. The plate strips consisting of different numbers of periodic ABH elements are considered in the scenarios with and without additional damping layer. It is observed that the bandgap-predicted attenuation band is split into two narrow attenuation bands, so that the periodic ABHs fails to ensure a broadband and continuous attenuation in the finite scenarios. Results show that there are resonance modes of finite plate strips with ABHs falling into the bandgap due to the boundary reflection and would result in high transmission peaks within the bandgap-predicted attenuation band. This unexpected phenomenon suggests the gap between the attenuation bandwidth of finite periodic structure and the bandgap of the corresponding infinite one. Analysis suggests that the resonance mode of finite plate strips, which reduces the bandgap-predicted attenuation bandwidth, can be predicted and tuned by changing the structure details.
AB - Acoustic Black Hole (ABH) lattice structures show promise for achieving broadband bandgap in lightweight design. Existing ABH lattice research usually assumes that the bandgaps of infinite periodic structure are roughly the same as the attenuation band with strong energy attenuation in the finite counterpart. This work is concerned with comparison of the real attenuation bandwidth of finite ABH periodic structures and the bandgap of the infinite counterpart. The plate strips consisting of different numbers of periodic ABH elements are considered in the scenarios with and without additional damping layer. It is observed that the bandgap-predicted attenuation band is split into two narrow attenuation bands, so that the periodic ABHs fails to ensure a broadband and continuous attenuation in the finite scenarios. Results show that there are resonance modes of finite plate strips with ABHs falling into the bandgap due to the boundary reflection and would result in high transmission peaks within the bandgap-predicted attenuation band. This unexpected phenomenon suggests the gap between the attenuation bandwidth of finite periodic structure and the bandgap of the corresponding infinite one. Analysis suggests that the resonance mode of finite plate strips, which reduces the bandgap-predicted attenuation bandwidth, can be predicted and tuned by changing the structure details.
KW - ABH
UR - http://www.scopus.com/inward/record.url?scp=85147442824&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85147442824
T3 - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
SP - 245
BT - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
PB - The Institute of Noise Control Engineering of the USA, Inc.
T2 - 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022
Y2 - 21 August 2022 through 24 August 2022
ER -