Journal
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
Volume 226, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmecsci.2022.107396
Keywords
Metastructure; Fish belly beam; Sandwich structure; Sound absorption; Non-local coupling
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Funding
- National Natural Science Foundation of China [11902223]
- Young Elite Scientists Sponsorship Program by CAST [2021QNRC001]
- program for professor of special appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning
- Fundamental Research Funds for the Central Universities
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In this study, we propose a perforated metastructure combining fish-belly panels and a corrugated sandwich structure for broadband sound absorption. We also design the optimal structure using a reinforcement learning algorithm and introduce a figure of merit for a comprehensive evaluation.
We propose a perforated metastructure combining fish-belly panels and a corrugated sandwich structure for broadband sound absorption. The curved panels provide a new degree of freedom for sound absorption while the sandwich structure ensures a very good mechanical strength. We develop an effective impedance theory to study the relationship between sound absorption performance and geometric factors. To achieve a broadband absorption, we further propose a second original metastructure based on a 4-units coupling mechanism and the optimal structure is designed with the help of reinforcement learning algorithm. Finally, we define and discuss a figure of merit that reveals a global evaluation of both the acoustical and mechanical performances. Our work provides a promising platform, namely lightweight multifunctional structures for noise and load-bearing control in various industries with large-scale and inexpensive commercial manufacture technologies.
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