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Design of a Helmholtz Resonator for Noise Reduction in a Duct Considering Geometry Information: Additional Relationship Equation and Experiment

형상 정보를 고려한 덕트 소음 저감용 헬름홀츠 공명기 설계: 추가 관계식과 실험

  • 류호경 (아주대학교 기계공학과) ;
  • 정성진 (삼성 메디슨, 시스템개발 Lab.) ;
  • 이진우 (아주대학교 기계공학과)
  • Received : 2014.01.08
  • Accepted : 2014.02.20
  • Published : 2014.04.01

Abstract

An additional relationship equation is numerically obtained to increase the accuracy of the conventional equation for obtaining the resonant frequency of a resonator. Although the conventional equation is widely used in industry because of its simplicity, it does not provide enough information on the cavity or the neck of the resonator for noise reduction in a duct. Resonator designers have difficulty implementing resonator design owing to the uncertainty in geometry presented by the well-known formula for determining the resonant frequency. To overcome this problem, this work determines an approximate equation using results of numerical calculation. To this end, shape parameters of the neck and cavity of a resonator are defined, and an equation describing the relationship between them is derived by adjusting the peak frequency in the transmission loss curve of a resonator to its resonant frequency. The application and validity of the derived equation are investigated in a numerical simulation and an acoustic experiment, respectively.

Keywords

Resonator Design;Geometry Uncertainties;Transmission Loss;Shape Parameter;Resonant Frequency;Peak Frequency

Acknowledgement

Supported by : 한국연구재단

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