Acoustical Performance of a Sonic Crystal Window

Hsiao Mun Lee, Long Bin Tan, Kian Meng Lim, and Heow Pueh Lee
Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576, Singapore
Abstract—Experimental studies were performed on the sonic crystal (SC) window to investigate its acoustical performance at the reverberation room. The maximum insertion loss (IL) can be found at frequency of 1000 Hz which is about 9.11 dBA. The amount of noise attenuated by the SC window at frequencies of 700 Hz to 1400 Hz was 2.44 times as high as that of 100 Hz to 3100 Hz. The noise attenuation peaks at all receiver positions still remain at the same frequency as 0° even though the angles of louver blades were increased to 30° and 60°. The effects of louver blades angles on the SC window reduced with the increasing distance from the SC window. The amount of noise attenuated by the SC window was reduced by 59.81% when the rows of SC were reduced to half of its original numbers.
 
Index Terms—acoustic, sonic crystal, noise, reverberation room

Cite: Hsiao Mun Lee, Long Bin Tan, Kian Meng Lim, and Heow Pueh Lee, "Acoustical Performance of a Sonic Crystal Window," International Journal of Mechanical Engineering and Robotics Research, Vol. 6, No. 1, pp. 6-10, January 2017. DOI: 10.18178/ijmerr.6.1.6-10
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