Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 163, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2021.108149
Keywords
Vibration attenuation band; Acoustic black hole; Local structural resonance; Modal transmission; Modal displacement cancellation
Categories
Funding
- National Natural Science Foundation of China [11532006, 51775267]
- Outstanding Youth Science Foundation of China [52022039]
- Research Grants Council of Hong Kong Special Administrative Region, China [PolyU 152023/20E]
- Natural Science Foundation of Jiangsu Province [BK20181286]
- Equipment Pre-research Foundation [80910010102]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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This study investigates the vibration transmission characteristics of a plate strip embedded with multiple 2D ABH without additional damping material. The results show vibration attenuation phenomenon below the cut-on frequency of ABHs, with the width and position of the attenuation bands depending on the number of ABHs. The analysis reveals dual physical effects and the important role of local structural resonances induced by ABHs in reducing modal transmission and cancellation. The attenuation phenomenon enriches the understanding of ABH structures and expands the design perspective for vibration attenuation through band creation.
Acoustic Black Hole (ABH) structures allowing for wave manipulation and energy focalization have potential applications in broadband structural vibration suppression. In this work, the vibration transmission characteristics of a plate strip embedded with multiple two-dimensional (2D) ABH without additional damping material were investigated. Both the simulation and experimental results show that the investigated structure exhibits attenuation bands with low vibration transmission, and the vibration attenuation phenomenon appears in frequency ranges well below the cut-on frequency of the ABHs. The width and position of the attenuation bands depend on the number of ABHs. A numerical investigation was carried out on the mechanism of the attenuation band generation. The analysis results show dual physical effects: low modal transmission in asymmetrical structures and modal displacement cancellation on the receiving side in both asymmetrical and symmetrical structures. Strong local structural resonances induced by ABHs play an important role in modal transmission reduction, modal displacement cancellation and weak excitation of some modes. The attenuation phenomenon reveals a new ABHspecific feature which enriches the existing knowledge on ABH structures and broadens the design perspective of vibration attenuation through band creation.
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