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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Low-frequency Noise Reduction in an Enclosure by using a Helmholtz Resonator Array

헬름홀츠 공명기 배열을 이용한 인클로저 내부의 저주파 소음 저감

  • 박순홍 (한국항공우주연구원 발사체기술연구소) ;
  • 서상현 (한국항공우주연구원 발사체기술연구소)
  • Received : 2012.05.23
  • Accepted : 2012.07.04
  • Published : 2012.08.20
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Abstract

A method of the low-frequency noise reduction in an enclosure by using an array of Helmholtz resonator is presented. An integral form of equation, which represents the acoustical coupling between the internal sound field and the resonator array, is formulated so that the boundary element method can be applied to solve the coupling problem. It is shown that the resonator array on the surface of the enclosure can be regarded as impedance patches on the boundary element. Experiments on a simple enclosure acoustically coupled with an array of resonators are conducted to verify the method. The predicted noise reduction by the boundary element method shows good agreement with the measured one. The effects of the resistance of resonators as well as the number of resonators on the noise reduction are demonstrated. As a practical example, the presented method is applied to the payload fairing of a space launcher with resonator arrays. It is demonstrated that the resistance of resonators affects significantly the required number of resonators to achieve a desired noise reduction.

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References

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Cited by

  1. Design of a Helmholtz Resonator for Noise Reduction in a Duct Considering Geometry Information: Additional Relationship Equation and Experiment vol.38, pp.4, 2014, https://doi.org/10.3795/KSME-A.2014.38.4.459