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Reduction of Structure-borne Noises in a Two-Dimensional Cavity using Optimal Treatment of Damping Materials

제진재의 최적배치를 통한 이차원 공동의 구조기인소음 저감

  • Published : 2006.12.01

Abstract

An optimization formulation is proposed to minimize sound pressures in a two-dimensional cavity by controlling the attachment area of viscoelastic unconstrained damping materials. For the analysis of structural- acoustic systems, a hybrid approach that uses finite elements for structures and boundary elements for cavity is adopted. Four-parameter fractional derivative model is used to accurately represent dynamic characteristics of the viscoelastic materials with respect to frequency and temperature. Optimal layouts of the unconstrained damping layer on structural wall of cavity are identified according to temperatures and the amount of damping material by using a numerical search algorithm.

Keywords

References

  1. Nakra, B.C., 1998, 'Vibration Control in Machines and Structures Using Viscoelastic Damping,' Journal of Sound and Vibration, Vol. 211, pp.449-465 https://doi.org/10.1006/jsvi.1997.1317
  2. Akanda, A. and Goerchius, G.M., 1999, 'Representation of Constrained/Unconstrained Layer Damping Treatments in FEA/SEA Vehicle System Models: A Simplified Approach,' SAE Paper No. 1999-01-1680
  3. Kim, D.Y., Hong, D.K. and Ahn, C.W., 2004, 'Acoustic Constrol of Optional Space Using Optimum Location of Absorbing Material,' Transactions of the KSNVE, Vol. 14(10), pp. 1048-1054 https://doi.org/10.5050/KSNVN.2004.14.10.1048
  4. Lee, D.H. and Hwang, W.S., 2004, 'Layout Optimization of an Unconstrained Viscoelastic Layer on Beams Using Fractional Derivative Model,' AIAA Journal, Vol. 42, No. 10, pp.2167-2170 https://doi.org/10.2514/1.7482
  5. Lee, D.H., 2005, 'Optimal Treatment of Unconstrained Visco-elastic Damping Layer on Beam to Minimize Vibration Responses,' Transactions of the KSNVE, Vol. 15, No. 7, pp. 645-651 https://doi.org/10.5050/KSNVN.2005.15.7.829
  6. Wu, T.W.(editor), 2000, Boundary Element Acoustics: Fundamentals and computer codes, WIT Press, Ashurst
  7. Jones, D.I.G, 2001, Handbook of Viscoelastic Vibration Damping, John Wiley & Sons, New York
  8. Tritz, T., 1996, 'Analysis of Four-Parameter Fractional Derivative Model of Real Solid Materials,' Journal of Sound and Vibration, Vol. 195(1), pp.103-115 https://doi.org/10.1006/jsvi.1996.0406
  9. Nashif, A.D., 1985, Jones, D.I.G, and Henderson, J.P., Vibration Damping, John Wiley & Sons, New York
  10. Sun, C.T. and Lu, Y.P., 1995, Vibration Damping of Structural Elements, Prentice Hall, Inc., London
  11. Lee, D.H., 2006, 'Damping Layout Optimization to Reduce Structure-borne Noises in a Two-dimensional Cavity,' Proceedings of COSEIK Annual Conference(4.13-14, Mujou), pp.805-812
  12. Nam, K.U., Park, J.B. and Kim, Y.R., 2001, 'Quiet Zone Generation by Absorption Materials,' Transactions of the KSNVE, Vol. 11(2), pp.221-225
  13. Arora, J.S., 1988, Introduction to optimum design, McGraw-Hill Inc., New York