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

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Leakage on the Noise Reduction Characteristics of Helmholtz Resonator

누출이 헬름홀츠 공명기의 소음저감 특성에 미치는 영향

  • 이일재 (전북대학교 기계공학과)
  • Published : 2009.06.20
Download PDF
⟨ Previous Next ⟩

Abstract

Helmholtz resonator has been used, especially in intake and exhaust systems of vehicles, due to its good noise reduction characteristics at low frequencies. Many approaches have been developed to predict the acoustic behavior of the resonator with the assumption that there is no leakage from the resonator. However, its behavior may be affected by leakage which may exist in manufacturing processes or on purpose. This study investigates the effect of leakage on the noise reduction characteristics of Helmholtz resonator with two practical examples. One is a resonator with a gap between baffle and housing of the resonator and the other one is a resonator with two drain holes on the baffle. The measured transmission loss shows that the resonance frequencies are considerably shifted to higher frequency due to the leakage. The Boundary Element Method was applied to predict the transmission loss of the Helmholtz resonator with drain holes. The comparison between the measured and predicted transmission loss shows that the acoustic impedance of the holes is essential for accurate predictions of the transmission loss.

Keywords

References

  1. Ingard, U., 1953, “On the Theory and Design of Acoustic Resonators,” Journal of Acoustical Society of America, Vol. 25, pp. 1037-1061 https://doi.org/10.1121/1.1907235
  2. Chanaud, R. C., 1994, “Effects of Geometry on the Resonance Frequency of Helmholtz Resonators,” Journal of Sound and Vibration, Vol. 178, pp. 337-348 https://doi.org/10.1006/jsvi.1994.1490
  3. Haa, S. T. and Kim, Y.-H., 1994, “The Limitation and Applicability of Helmholtz Resonator, Regarding as Equivalent Single-degree of Vibration System,” Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 4, No. 2, pp. 209-219
  4. Dickey, N. S. and Selamet, A., 1996, “Helmholtz Resonators : One-dimensional Limit for Small Cavity Length-to-diameter Ratios,” Journal of Sound and Vibration, Vol. 195, pp. 512-517 https://doi.org/10.1006/jsvi.1996.0440
  5. Selamet, A., Radavich, P. M., Dickey, N. S., and Novak, J. M., 1997, “Circular Concentric Helmholtz Resonator,” Journal of Acoustical Society of America, Vol. 101, pp. 41-51 https://doi.org/10.1121/1.417986
  6. Selamet, A. and Ji, Z. L. 2000, “Circular Asymmetric Helmholtz Resonators,” Journal of Acoustical Society of America, Vol. 107, pp. 2360-2369 https://doi.org/10.1121/1.428622
  7. Kim, S. R. and Kim, Y.-H., 2005, “A Helmholtz Resonator Array Panel for Low Frequency Sound Absorption,” Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 15, No. 8, pp. 924-930 https://doi.org/10.5050/KSNVN.2005.15.8.924
  8. Song, H.-Y. and Lee, D.-H., 2008, “A Study on the Acoustic Absorption Performance of a Helmholtz Resonator,” Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 18, No. 1, pp. 71-79 https://doi.org/10.5050/KSNVN.2008.18.1.071
  9. Bemman, Y., Frei, T., Jones, C. and Keck, M., 2005, “Passive Exhaust Systems with Cylinder Deactivation,” SAE 2005-01-2351
  10. Lee, I. J., Selamet, A. and Huff, N. T., 2006, “Acoustic Impedance of Perforations in Contact with Fibrous Material,” Journal of Acoustical Society of America, Vol. 119, pp. 2785-2797 https://doi.org/10.1121/1.2188354
  11. Stinson, M. R. and Shaw, E. A. G., 1985, “Acoustic Impedance of Small, Circular Orifices in Thin Plate,” Journal of Acoustical Society of America, Vol. 77, pp. 2039-2042 https://doi.org/10.1121/1.391776
  12. Thurston G. B. and Wood J. K., 1953, “End Corrections for a Concentric Circular Orifice in a Circular Tube,” Journal of Acoustical Society of America, Vol. 25, pp. 861-863 https://doi.org/10.1121/1.1907207

Cited by

  1. External Leakage on Helmholtz Resonators vol.23, pp.8, 2013, https://doi.org/10.5050/KSNVE.2013.23.8.752