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Keywords = metasilencer

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20 pages, 490 KB  
Systematic Review
A Systematic Review of Emerging Ventilated Acoustic Metamaterials for Noise Control
by Linus Yinn Leng Ang, Fangsen Cui, Kian-Meng Lim and Heow Pueh Lee
Sustainability 2023, 15(5), 4113; https://doi.org/10.3390/su15054113 - 24 Feb 2023
Cited by 25 | Viewed by 7262
Abstract
As sustainability is one of the main pillars in developing future cities, adopting natural ventilation whenever possible is one way to reduce energy consumption, thus indirectly reducing carbon dioxide emissions. Lately, ventilated acoustic metamaterials have started to receive more research attention because of [...] Read more.
As sustainability is one of the main pillars in developing future cities, adopting natural ventilation whenever possible is one way to reduce energy consumption, thus indirectly reducing carbon dioxide emissions. Lately, ventilated acoustic metamaterials have started to receive more research attention because of how they can provide both ventilation and noise control. Motivated by this research attention, we present this timely systematic review of emerging ventilated acoustic metamaterials for noise control. By limiting the review to a five-year coverage (2018–2023), three kinds of ventilated acoustic metamaterials were identified—metamufflers, metapanels, and metacages. Based on the studies included in this review, we discuss the present challenges of metacages. More research efforts are still needed to see real-world applications of metacages as a novel ventilated noise control measure in the future. Full article
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12 pages, 6509 KB  
Article
Development of a Metasilencer Considering Flow in HVAC Systems
by Hyunsu Kim, Yoonjung Kwon, Sangwoo Lee, Juin Kim and Dongchul Park
Appl. Sci. 2022, 12(22), 11322; https://doi.org/10.3390/app122211322 - 8 Nov 2022
Cited by 5 | Viewed by 2509
Abstract
Although the driving noise of electric vehicles has been reduced compared with that of internal combustion engine vehicles, a new interior noise problem is emerging. It is crucial to reduce the noise of the heating, ventilation, and air conditioning (HVAC) system, which is [...] Read more.
Although the driving noise of electric vehicles has been reduced compared with that of internal combustion engine vehicles, a new interior noise problem is emerging. It is crucial to reduce the noise of the heating, ventilation, and air conditioning (HVAC) system, which is one of the main causes of interior noise. Therefore, in this study, a metasilencer with an acoustic metasurface structure is presented. The metasilencer was designed to restrain the travel direction of the sound wave of the target frequency into a U-shaped configuration using an acoustic metasurface while considering the flow noise effect of the HVAC system. Acoustic analysis confirmed the noise reduction frequency range and refraction effect of the metasurface. The speaker test confirmed the noise reduction effect of the silencer. The same was also confirmed via HVAC tests, even in the presence of a flow. Full article
(This article belongs to the Special Issue Recent Advance in Acoustic Metamaterials)
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