Abstract
Acoustic metamaterials have opened promising opportunities for manipulation of low-frequency sound and development of compact structures with a broadband acoustic performance for noise mitigation applications, room, and architectural acoustics. So far, several mechanisms have been studied to achieve broadband sound absorption at subwavelength frequencies, when the system thickness is much smaller than the wavelength of sound waves. In this paper, we analyze two other approaches based on the use of interacting and coupled resonators with the aim to further reduce a structural thickness. We numerically demonstrate that properly designed panels with interacting resonators allow extending a single-peak absorption to broadband frequencies, while coupled resonators enable achieving broadband absorption at several frequency ranges. The developed designs are inspired by ancient Slavic folk patterns, attracting attention by their delicate ligature, multi-layered structure, and concealed meaning. Our results open new possibilities for creating acoustic metamaterials with art effects, which provide meaning to occupied space and make these metamaterials more appealing for applications.
Highlights
Manipulation of low-frequency sound is a challenge due to the limited acoustic performance of conventional materials (Allard and Atalla, 2009)
We numerically investigated two approaches for broadening the sound absorption of acoustic metamaterial panels with incorporated Helmholtz resonators (HRs)
We show that the panels with coupled HRs can attenuate broadband sound at several subwavelength frequency ranges
Summary
Manipulation of low-frequency sound is a challenge due to the limited acoustic performance of conventional materials (Allard and Atalla, 2009). A common approach to broaden the bandwidth is the use of multiple detuned resonating units with absorption peaks at different frequencies These can be optimally designed panels with graded sets of quarter-wavelength resonators (Jiang et al, 2014; Groby et al, 2016), series of detuned HRs (Groby et al, 2015; Jiménez et al, 2016, 2017b), space-coiled channels (Zhang and Hu, 2016; Tang et al, 2017; Jia et al, 2018) or poroelastic plates in rigidly-backed waveguides (Romero-García et al, 2016). Since even the thinnest absorbers reduce available space, they can be designed in a creative way, playing the role of artwork, in addition to tailored audible performance This can be achieved by incorporating ornamental designs of acoustic metamaterials, i.e., balancing the relationship between voids and solids, with the aim to improve visual experience and personalize the environment targeted at a specific audience.
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