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http://dx.doi.org/10.3795/KSME-A.2015.39.4.437

Design of a Perforated Panel for Transmission Noise Reduction  

Park, Younghyo (Gyeonggi Science High School)
Bae, Jaehyeok (Gyeonggi Science High School)
Lee, Jin Woo (Division of Mechanical Engineering, Ajou Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.39, no.4, 2015 , pp. 437-445 More about this Journal
Abstract
A design method for a perforated panel is suggested to reduce the level of incident noise without obstructing the flow of incoming fluid. The key idea was to insert an array of 1/4 wavelength tubes around the holes of the perforate panel. First, various case studies were performed for a unit model with only one hole. In order to avoid any increase in the panel thickness, the unit model was vertically divided into three layers, and only the middle layer was used as the design domain. The number and array of 1/4 wavelength tubes connected to the hole were optimized to obtain the widest effective frequency range in the transmission loss curve as possible. Then, the optimally designed unit model was converted to a periodic array in the perforated panel to achieve the design goals. Even if the target frequency and the target transmission loss were set to 1000 Hz and 10 dB, respectively, the suggested design method for the a perforated panel could achieve noise reduction for various target values.
Keywords
Optimal Shape Design; Noise Reduction; Perforated Panel; Sound;
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