Journal
APPLIED PHYSICS LETTERS
Volume 117, Issue 22, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0031891
Keywords
-
Categories
Funding
- National Natural Science Foundation of China [11972029]
- Hong Kong Research Grants Council General Research Fund [16202519]
Ask authors/readers for more resources
This Letter reports an acoustic metasurface for low-frequency sound absorption with a compact size in both vertical and lateral directions, which is constructed by a series of Helmholtz resonators with spiral extended necks. Analytical, numerical, and experimental results show that the metasurface with a thickness of 13.5mm possesses total sound absorption at 320Hz under normal incidence. The thickness of the prototype is only about 1/80th of the operating wavelength (lambda). What is more, the side length of the basic unit (25mm) is also on the deep-subwavelength scale ( lambda / 43). To widen the narrow effective absorption bandwidth of the uniform absorber, the strategy of parallel arrangement of different elements is employed. A wideband absorber consisting of four inhomogeneous units is optimally designed to maximize the averaged absorption coefficient in a prescribed frequency range of [360, 410] Hz. The experimental results show that the absorber with a thickness of 13.5mm exhibits high absorption (the averaged absorption coefficient is about 0.9) in the desired frequency range. The features of effective low-frequency sound absorption, compact dimension, and high absorption with a tunable bandwidth make the proposed acoustic metasurface promising for various applications in noise control engineering.
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