Journal
JOURNAL OF SOUND AND VIBRATION
Volume 512, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2021.116401
Keywords
Acoustic black hole; Sonic black hole; Wave retarding and trapping; Micro-perforated panels; Low frequency and ultra-broadband perfect; sound absorption
Categories
Funding
- Fundamental Research Funds for the Central Universities [WUT: 2021IVA026]
Ask authors/readers for more resources
This paper proposes a Sonic black hole (SBH) sound absorber inside a circular duct in conjunction with the use of Microperforated panels (MPPs) to achieve broadband and low-frequency sound absorption. Through finite element simulations and experimental confirmation, the device is shown to have superior sound absorption performance and potential advantages over traditional noise control devices.
Acoustic black holes (ABHs) have been so far investigated mainly for flexural wave manipulation in structures. Exploration of ABHs for sound wave manipulation, referred to as Sonic black holes (SBHs), as well as the design of SBH-based noise control devices are scarce. To fill the gap, this paper proposes a SBH sound absorber inside a circular duct in conjunction with the use of Microperforated panels (MPPs) to achieve broadband and low-frequency sound absorption. Capitalizing on the ABH-specific wave retarding and trapping phenomena and the energy dissipation ability of the MPP, a compact and ultra-broadband near perfect sound absorbing device with subwavelength thickness is realized for noise abatement in a duct. Finite element simulations are performed to assess the achieved sound absorption performance, which is experimentally confirmed by impedance tube tests. Analyses reveal that the physical mechanism underpinning the superior sound absorption is attributed to the combined effects of the ABH-induced wave speed changes, energy trapping and the spatially graded local resonances of the cavity-backed MPP. The proposed solution shows promise for circumventing some existing limitations of traditional noise control devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available