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A Study on the Absorption Performance of a Perforated Panel type of Resonator

다공패널형 공명기의 흡음성능에 관한 연구

  • Song, Hwayoung (Department of Energy System Engineering, Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Yang, Yoonsang (Department of Energy System Engineering, Graduate School of Energy and Environment, Seoul National University of Science and Technology) ;
  • Lee, Donghoon (Department of Mechanical and Automotive Engineering, Seoul National University of Science and Technology)
  • 송화영 (서울과학기술대학교 에너지환경대학원 에너지시스템공학과) ;
  • 양윤상 (서울과학기술대학교 에너지환경대학원 에너지시스템공학과) ;
  • 이동훈 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2016.03.29
  • Accepted : 2016.05.14
  • Published : 2016.06.10

Abstract

When aiming to reduce the low frequency noise of a subway guest room through sound absorbing treatment methods inside the wall of a tunnel the resonator is often more effective than a porous sound absorbing material. Therefore, the perforated panel type resonator embedded with a perforated panel is proposed. The perforated panel is installed in the neck, which is then extended into the resonator cavity so that it can ensure useful volume. The absorption performance of the perforated panel type of resonator is obtained by acoustic analysis and experiment. The analytical results are in good agreement with the experimental results. In the case of multiple perforated panel type resonators, as the number of perforated panels increase, the 1st resonance frequency is moved to a low frequency band and sound absorption bandwidth is extended on the whole. In order to obtain excellent absorption performance, the impedance matching between multi-panels should be considered. When the perforated panel in the resonator is combined with a porous material, the absorption performance is highly enhanced in the anti-resonance and high frequency range. In case of the resonator inserted with perforated panels of 2, the 2nd resonance frequency is shifted to a low frequency band in proportion to the distance between perforated panels.

Acknowledgement

Supported by : 한국환경산업기술원

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