Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Noise Reduction Characteristics of a High-performance Air-gap Resonator

고효율 에어갭 공명기의 소음 저감 특성

  • 강상욱 (한성대학교 기계시스템공학과) ;
  • 이장무 (서울대학교 기계설계학과) ;
  • 임원식 (서울산업대학교 자동차공학과)
  • Published : 2004.02.01
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Abstract

The objective of the paper is to demonstrate the noise reduction characteristics of an air-gap resonator, which is composed of an air gap and a partition sheet. By means of installing the air-gap resonator in an enclosed cavity, acoustic resonance can be effectively suppressed using a small space. In particular, it is revealed from a simple, one-dimensional model that the air-gap resonator serves as the Helmholtz resonator that generally absorbs acoustic resonance energy at its resonance frequency. As a result, the air-8ap resonator also has a resonance frequency, which can be predicted with a simple frequency equation derived in the paper. Finally, verification experiments show that the air-gap resonator can be effectively designed by predicting a reasonable gap thickness using the simple frequency-equation.

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References

  1. Ingard, U., 1953, 'On the Theory and Design of Acoustic Resonators,' Journal of the Acoustical Society of America, Vol. 25, pp. 1037-1061 https://doi.org/10.1121/1.1907235
  2. Alster, M., 1972, 'Improved Calculation of Resonant Frequencies of Helmholtz Resonators,' Journal of Sound and Vibration, Vol. 24, No. 1, pp. 63-85 https://doi.org/10.1016/0022-460X(72)90123-X
  3. 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
  4. Chanaud, R. C., 1997, 'Effects of Geometry on the Resonance Frequency of Helmholtz Resonators: Part II,' Journal of Sound and Vibration Vol. 204, pp. 829-834 https://doi.org/10.1006/jsvi.1997.0969
  5. Selamet, A., Radavich, P. M., Dickey, N. S. and Novak, J. M., 1997, 'Circular concentric Helmholtz resonators,' Journal of the Acoustical Society of America, Vol. 101, No. 1, pp. 41-51 https://doi.org/10.1121/1.417986
  6. Selamet, A. and Ji, J. L., 1997, 'Circular asymmetric Helmholtz resonators,' Journal of the Acoustical Society of America, Vol. 107, No. 5, pp. 2360-2369 https://doi.org/10.1121/1.428622
  7. Oh, J. E., Han, K. H. and Hong, J. H., 1998, 'Development of the Simulator for Estimating Intake Noise of Vehicle and Its Improvement (Part I)- Selection of Optimum Position of a Resonator,' Transactions of the KSME, A, Vol. 22, No. 2, pp. 391-398
  8. Lee, D. H., Hur, S. H. and Kwon, Y. P., 2002, 'Estimation of the Sound Absorption Performance for Multiple Layer Perforated Plate Systems by Transfer Matrix Method,' Transactions of the Korean Society for Noise and Vibration Engineering, Vol. 29, No. 9, pp.709-716 https://doi.org/10.5050/KSNVN.2002.12.9.709
  9. Frommhold, W., Fuchs, H. V. and Sheng, S., 1994, 'Acoustic Performance of Membrane Absorbers,' Journal of Sound and Vibration, Vol. 170, No. 5, pp. 621-636 https://doi.org/10.1006/jsvi.1994.1091
  10. Sakagami, K., Kiyama, M., Morimoto, M. and Takahashi D., 1996, 'Sound Absorption of a Cavity-Backed Membrane,' Applied Acoustics, Vol. 49, No. 3, pp. 237-247 https://doi.org/10.1016/S0003-682X(96)00025-4
  11. Kang, S. W. and Lee, J. M., 2000, 'Structural-Acoustic Coupling Analysis on Vehicle Passenger Compartment with the Roof, Air-Gap, and Trim Boundary,' Journal of Vibration and Acoustics, Transactions of the ASME, Vol. 122, No. 3, pp. 196-202 https://doi.org/10.1115/1.1302984
  12. Reynolds, D., 1981, Engineering Principles of Acoustics Noise and Vibration Control, Allyn and Bacon, Boston, pp. 333-344