Structure-borne transmissibility evaluation through modeling and analysis of aircraft vibration dampers

Hidalgo, Isabel Lima; Nabarrete, Airton; Santos, Marcelo

doi:10.5028/jatm.2011.03021611

Abstract

In the aircraft industry a great practical relevance is given to the extensive use of vibration dampers between fuselage and interior panels. The proper representation of these isolators in computer models is of vital importance for the accurate evaluation of the vibration transmission paths for interior noise prediction. In general, simplified models are not able to predict the component performance at mid and high frequencies, since they do not take into account the natural frequencies of the damper. Experimental tests are carried out to evaluate the dynamic stiffness and the identification of the material properties for a damper available in the market. Different approaches for its modeling are analyzed via FEA, resulting in distinct dynamic responses as function of frequency. The dynamic behavior, when the damper natural modes are considered jointly with the high modal density of the plate that represents the fuselage, required the averaging of results in the high frequency range. At this aim, the statistical energy analysis is then used to turn the comparison between models easier by considering the averaged energy parameters. From simulations, it is possible to conclude how the damper natural modes influence the dynamic response of aircraft interior panels for high frequencies.

Keywords:
Vibration damper; Fuselage structures; Vibroacoustic; Dynamic stiffness; SEA

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REFERENCES

Bathe, K. J., 1996, Finite element procedures, Prentice-Hall, New Jersey, USA.
Beranek, L. L., Vér, I. L., 1992, Noise and vibration control engineering - principles and application, Jonh Wiley & Sons Inc., New Jersey, USA.
Clark, M. D., Hain, H. L., 1996, A systematic approach used to design floor panel isolation for commercial aircraft, Proceedings of Noise-Con 96, Seattle, USA, pp. 455-460.
Craig Jr., R. R., 1981, Structural dynamics, an introduction to computer methods, Wiley, New York.
Craig, R. R., Bampton Jr., M., 1968, Coupling of substructures for dynamic analysis, AIAA Journal 6, pp. 1313-1319.
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Downey, P., Bachman, G., Diffendall, C., 2001, Microcellular resilience for optimised insertion loss using an rubber insulating material, Proceedings of Noise-Con 2001, Portland, USA.
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Gardner, B. K., Shorter, P. J., Cotoni, V., 2005, Modeling vibration isolators at mid and high frequency using Hybrid FE-SEA Analysis, Proceedings of InterNoise 2005, Rio de Janeiro, Brazil.
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» http://www.lord.com
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Snowdon, J. C., 1979, Vibration isolation: use and characterization, Journal of the Acoustical Society of America, Vol. 66, pp. 1245-1274.
Weisbeck, J. N., 2006, Effect of stiffness, damping, and design on side panel isolator noise attenuation characteristics, Proceedings of InterNoise 2006, Honolulu, USA.
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Publication Dates

Publication in this collection
May-Aug 2011

History

Received
03 May 2011
Accepted
14 June 2011

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Bathe, K. J., 1996, Finite element procedures, Prentice-Hall, New Jersey, USA.

[2] Beranek, L. L., Vér, I. L., 1992, Noise and vibration control engineering - principles and application, Jonh Wiley & Sons Inc., New Jersey, USA.

[3] Clark, M. D., Hain, H. L., 1996, A systematic approach used to design floor panel isolation for commercial aircraft, Proceedings of Noise-Con 96, Seattle, USA, pp. 455-460.

[4] Craig Jr., R. R., 1981, Structural dynamics, an introduction to computer methods, Wiley, New York.

[5] Craig, R. R., Bampton Jr., M., 1968, Coupling of substructures for dynamic analysis, AIAA Journal 6, pp. 1313-1319.

[6] Craig Jr., R.R., 1987, A review of time-domain and frequency-domain component-mode synthesis methods, Journal of Analytical and Experimental Modal Analysis, Vol. 2, pp. 59-72.

[7] Downey, P., Bachman, G., Diffendall, C., 2001, Microcellular resilience for optimised insertion loss using an rubber insulating material, Proceedings of Noise-Con 2001, Portland, USA.

[8] ESI Group, 2009, VaOne 2009 Guide.

[9] Ewins, D. J., 2000, Modal testing: theory, practice and application, 2^nd edition, John Wiley & Sons Inc., New York.

[10] Fahy, F., Gardonio, P., 2007, Sound and structural vibration, 2^nd edition, Elsevier, Oxford, UK.

[11] Gardner, B. K., Shorter, P. J., Cotoni, V., 2005, Modeling vibration isolators at mid and high frequency using Hybrid FE-SEA Analysis, Proceedings of InterNoise 2005, Rio de Janeiro, Brazil.

[12] Langley, R. S., Bremner, P. G, 1999, A hybrid method for the vibration analysis of complex structural-acoustic systems, Journal of the Acoustical Society of America, 105, pp.1657-1671.

[13] Langley, R. S., Fahy F. J., 2004, Noise and Vibration, 1^st edition, Chapter 11 - Advanced Applications in Acoustics, Spon Press, London UK.

[14] Jones, D. I. G., 2001, Handbook of viscoelastic vibration damping, Jonh Wiley & Sons Inc., West Sussex, England.

[15] Lyon, R. H., DeJong, R. G., 1995, Theory and application of statistical energy analysis, Butterworth-Heinemann, Boston, EUA.

[16] Lord Corporation, <http://www.lord.com>, in June 6, 2010.
» http://www.lord.com

[17] Molloy, C. T., 1957, Use of four-pole parameters in vibration calculations, Journal of the Acoustical Society of America, Vol. 29, pp. 842-853.

[18] MSC Software, 2008, MSC Nastran 2008 Quick Reference Guide.

[19] Nashif, A. D., Jones, D. I., Henderson, J. P., 1985, Vibration damping, John Wiley & Sons Inc., New York, USA.

[20] Shorter, P. J., Langley, R. S., 2005, Vibro-acoustic analysis of complex systems, Journal of Sound and Vibration, Vol. 288, pp. 669-699.

[21] Snowdon, J. C., 1979, Vibration isolation: use and characterization, Journal of the Acoustical Society of America, Vol. 66, pp. 1245-1274.

[22] Weisbeck, J. N., 2006, Effect of stiffness, damping, and design on side panel isolator noise attenuation characteristics, Proceedings of InterNoise 2006, Honolulu, USA.

[23] Weisbeck, J. N., Sanetick, R. M., Zmijevski, T. R. L., 2009, Structure borne noise control of oscillating pumps, Proceedings of InterNoise 2009, Ottawa, Canada.

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