Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Three-dimensional Numerical Study on Acoustic Performance of Large Splitter Silencers

대형 스플리터 소음기 성능에 대한 3차원 수치해석적 연구

  • Baek, Seonghyeon (Department of Mechanical Engineering, Chonbuk National University) ;
  • Lee, Changheon (Department of Mechanical Engineering, Chonbuk National University) ;
  • Gwon, Daehun (Sungshin Enstec) ;
  • Lee, Iljae (Department of Mechanical Engineering, Chonbuk National University)
  • Received : 2016.07.14
  • Accepted : 2017.01.26
  • Published : 2017.04.20
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Abstract

Acoustic performance of splitter silencers was investigated by using 3-dimensional commercial software and experiments. Flow resistivity of sound absorbing material was indirectly estimated by using an impedance tube setup and a curve fitting method. In addition the acoustic impedance of perforated plate was determined by an empirical formulation. Such properties have been used as input parameters in the commercial software. The prediction for a splitter silencer with 1000 mm length was compared with the experimental result. The numerical method is then applied to identify the effects of number of splitters, length of splitters, absorptive material density, and porosity of a perforated plate on the performance of the splitter silencers. As the number and length of splitter increases, the acoustic performance significantly increases. Although the increase of density of absorptive material also increase the acoustic performance, a change in the density over a certain level hardly affect it. The increase of porosity will enhance the performance especially at higher frequencies.

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References

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