Sage Journals: Discover world-class research

Abstract

A new class of smart foam is developed and attached to a flexible aluminum plate coupled with a rigid acoustic cavity in an attempt to evaluate its effectiveness in controlling the structural acoustics of the plate/cavity system. The proposed foam consists of a passive foam layer bonded to one surface of an active piezoelectric composite whose other surface is bonded to the surface of the vibrating plate. In this manner, the active piezoelectric composite can control from one side the porosity and the acoustic absorption characteristics of the foam and from the other side can suppress the vibration of the flexible plate. With such capabilities, the proposed smart foam can simultaneously control structural and acoustic cavity modes over a broad frequency range.

A finite element model is presented for the behavior of the smart foam when coupled with a plate/cavity system. The predictions of the model are validated experimentally using vibration and/or sound pressure level feedback control strategies. The obtained experimental results are found to be in good agreement with the predictions of the finite element model. Furthermore, it is found that vibration and noise attenuations of about 90% are obtained with control voltages of less than 180 volts for both vibration and sound pressure feedback.

Keywords

Smart foam vibration and noise control flat panels acoustic cavities

Get full access to this article

View all access options for this article.

References

Alam, N. and Asnani, N. T. , 1984, “Vibration and damping analysis of multilayered rectangular plates with constrained viscoelastic layers,” Journal of Sound and Vibration 97, 597-614 .

Balamurugan, V. and Narayanan, S. , 2001, “Active vibration control of smart shells using distributed piezoelectric sensors and actuators,” Journal of Smart Materials and Structures 10, 173-180 .

Baruh, H. , 1999, Analytical Dynamics, McGraw Hill, Boston, MA .

Baz, A., 1996, Active Constraint Layer Damping, US patent 5,485,053.

Baz, A. and Ro, J. , 1996, “Vibration control of plates with active constrained layer damping,” Journal of Smart Materials and Structures 5, 272-280 .

Baz, A. and Tempia, A. , 2004, “Active piezoelectric damping composites,” Journal of Sensors and Actuators A (Physical) 112, 340-350 .

Biot, M. A. , 1956, “Theory of propagation of elastic waves in a fluid-saturated porous solid,” Journal of the Acoustical Society of America 28, 168-191 .

Blanguernon, A. , Léné, F. and Bernadou, M. , 1999, “Active control of a beam using a piezoceramic element,” Journal of Smart Materials and Structures 8, 116-124 .

Bolton, J. S. and Green, E. R. , 1993, “Smart foams for active absorption of sound,” in Second Conference on Recent Advances in Active Control of Sound and Vibration, 28-30 April 1993, Blacksburg, VA pp. 139-149 .

10.

Fuller C. R. , Elliot S. J. and Nelson P. A. , 1997, Active control of vibration, Academic Press, London .

11.

Gentry, C. , Guigou, C. and Fuller, C. , 1997, “Smart foam for applications in passive-active noise radiation control,” Journal of the Acoustical Society of America, 101(4), 1771-1778 .

12.

Guigou, C. and Fuller, C. , 1998, “Adaptive feedforward and feedback methods for active/passive sound radiation control using smart foam,” Journal of the Acoustical Society of America, NewYork, NY 104(1), 226-231 .

13.

Kinsler, L. , Frey, A. , Coppens, A. and Sanders, J. , 1999, Fundamentals of Acoustics, 4th edition, John Wiley & Sons .

14.

Lueg, P., 1936, “Process of silencing sound oscillations”, US Patent 2,043,416.

15.

Oh, J. , Poh, S. , Ruzzene, M. and Baz, A. , 2000, “Vibration control of beams using electromagnetic compressional damping treatment,” Journal of Vibration and Acoustics 122, 235-243 .

16.

Orsagh, R. and Ghoneim, H. , 1999, “Experimental investigation of electromechanical surface damping,” in Smart Materials and Structures Conference in Damping, 3672, Ed. by T. Tiper Hyde , 1-5 March 1999, Newport Beach, CA 234-241 .

17.

Shen, I. Y. , 1994, “Hybrid Damping through Intelligent Constrained Layer Treatments,” Journal of Vibration and Acoustics 116, 341-349 .

18.

Shiau, N., 1991, “Multi-dimensional wave propagation in elastic porous materials with applications to sound absorption, transmission and impedance measurement,” PhD Thesis, Purdue University, West Lafayette, IN.

19.

Shields, W. , Ro, J. and Baz, A. , 1998, “Control of sound radiation from a plate into an acoustic cavity using active piezoelectric-damping composites,” Journal of Smart Materials and Structures 7, 1-11 .

20.

Yang, S. M. and Chiu, J. W. ,1993, “Smartstructures-vibration of composites with piezoelectric materials,” Journal of Composite Structures 25, 381-381 .

Active Vibration and Noise Control using Smart Foam

Abstract

Keywords

Get full access to this article

References