Passive Control of the Vibration and Sound Radiation from Submerged Shells

Abstract

Vibration and noise radiation from fluid-loaded cylindrical shells are controlled using multiple stiffeners and Passive Constrained Layer Damping treatment. Dynamic and fluid finite element models are developed to study the fundamental phenomena governing the interaction between the stiffened shell, with and without damping, and the fluid domain surrounding it. The models are used to predict the response of the shell and to evaluate the effect of the stiffening rings and damping treatment on both the structural vibration and noise radiation in the fluid domain. The prediction of the models are validated experimentally and against the predictions of a commercial FE software package (ANSYS). It is shown that stiffening of the shell reduces the amplitude of the vibration and noise radiation, particularly for high order lobar modes. The attenuation of the shell response and sound radiation can be significantly increased through the application of Passive Constrained Layer Damping treatment on the inner surface of the stiffening rings. The numerical and experimental validations demonstrate the accuracy of the developed models and emphasize its potential extension to the application of smart materials for active control of vibration and noise radiation from fluid-loaded shells.

Keywords

Passive vibration control and sound radiation fluid-loaded shells stiffened shells stiffened and damped shells

Get full access to this article

View all access options for this article.

References

ANSYS , 2001, Finite Element Software Package, ANSYS, Inc., Canonsburg, PA.

Baz, A. and Chen, T. , 2000, “Boundary control of axisymmetric vibrations of cylindrical shells using active constrained layer damping,” Journal of Thin-Walled Structures 36, 1-20.

Bert, C. W. , Kim, C. D. , and Birman, V. , 1993, “Vibration of composite cylindrical shells with ring and stringer stiffeners,” Composite Structures 25, 477-484.

Birman, V. , 1988, “Axisymmetric divergence of ring-stiffened composite cylindrical shells subject to axial compression,” ASME Journal of Applied Mechanics 55, 984-985.

Craggs, A. , 1971, “The transient response of a coupled plate-acoustic system using plate and acoustic finite elements,” Journal of Sound and Vibration 15, 509-528.

Everstine, G. C. , 1981, “A symmetric potential formulation for fluid-structure interaction,” Journal of Sound and Vibration 79, 157-160.

Junger, M. and Feit, D. , 1986, Sound, Structures and Their Interaction, 2nd Edition, MIT Press, Cambridge, MA.

Leissa, A. W. , 1973, Vibration of Shells, NASA SP-288, Government Printing Office, Washington, DC.

Markus, S. , 1976, “Damping properties of layered cylindrical shells, vibrating in axially symmetric modes,” Journal of Sound and Vibration 48, 511-524.

10.

Mead, D. J. and Bardell, N. S. , 1987, “Free vibration of a thin cylindrical shell with periodic circumferential stiffeners,” Journal of Sound and Vibration 115, 499-521.

11.

Nashif, A. , Jones, D. , and Henderson, J. , 1985, Vibration Damping, John Wiley and Sons, New York.

12.

Pan, H. H. , 1969, “Axisymmetrical vibrations of a circular sandwich shell with a viscoelastic core layer,” Journal of Sound and Vibration 9, 338-348.

13.

Photiadis, D. M. , 1996, “Wave mixing effects on a periodically ribbed cylindrical shell,” Journal of Acoustic Society of America 118, 100-106.

14.

Photiadis, D. M. , Williams, E. G. , and Houston, B. H. , 1997. “Wave-number space response of a near periodically ribbed shells,” Journal of Acoustic Society of America 101, 877-886.

15.

Ramesh, T. C. and Ganesan, N. , 1994, “Finite element analysis of conical shells with a constrained viscoelastic layer,” Journal of Sound and Vibration 171, 577-601.

16.

Ray, M. , Oh, J. and Baz, A. , 2001, “Active constrained layer damping of thin cylindrical shells,” Journal of Sound and Vibration 240, 921-935.

17.

Ro, J. , Ali, A. , and Baz, A. , 1997, “Control of sound radiation from a fluid-loaded plate using Active Constrained Layer Damping,” in Proceedings of the 6th International Conference on Structural Dynamics, Institute of Sound and Vibration Research, University of Southampton, pp. 1257-1274.

18.

Skelton, E. A. and James, J. H. , 1997, Theoretical Acoustics of Underwater Structures, Imperial College Press, London.