Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7152436 | Applied Acoustics | 2017 | 5 Pages |
Abstract
Sonic crystals are periodic arrangement of scatterers made of material with low acoustic impedance or sound hard materials [1]. Sonic crystals have numerous applications such as green belts and sound barriers. Here we showed that a typical maze structure at children playground can attenuate noise effectively for frequencies ranging from 12.5Â Hz to 20,000Â Hz. The original designer for the maze structure probably does not have that in mind. The maze structure can be viewed as a sonic crystal structure with sound attenuation characteristics. We found that the maze was able to attenuate noise up to 17.9Â dBA for frequency range below 1000Â Hz and 23Â dBA for higher frequency range up to 20,000Â Hz. The maze structure was able to mitigate noise at a wide range of frequencies in addition to the center frequency (fc) of 478Â Hz which was estimated based on the Bragg's Law. The periodic effects of the maze was also proven by numerical studies. Our results demonstrated that the maze structure commonly found in children playgrounds was able to attenuate noise covering the whole human hearing range.
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Physical Sciences and Engineering
Engineering
Mechanical Engineering
Authors
Hsiao Mun Lee, Kian Meng Lim, Heow Pueh Lee,