Sage Journals: Discover world-class research

Abstract

In active constrained layer damping treatments there are two distinct physical mechanisms that contribute to vibration damping - increased passive damping due to increased shear in the viscoelastic material (VEM) layer, and damping due to transmission of active forces to the host structure. The present study demonstrates that the first mechanism is dominant when proportional feedback is used while the second mechanism is dominant when derivative feedback is used. In the case of proportional feedback, the shear in the VEM increases considerably so that the passive damping is significantly larger than that obtained for the zero-voltage case, but the active action is actually detrimental. In the case of velocity feedback, the shear strain levels in the VEM are virtually unchanged, and all of the damping augmentation is due to the active action. It is also seen that if position feedback is used, moderate values of VEM shear modulus that provide optimal passive damping, are best. On the other hand, if velocity feedback is used, high values of VEM shear modulus that allow best transmission of active forces from the active piezoelectric layer to the host structure, provide maximum augmentation in damping, with the maximum total damping depending on the feedback gain used.

Keywords

Active Constrained Layer Damping Treatments

Get full access to this article

View all access options for this article.

References

1. Baz, A. and Ro, J. “Active Constrained Layer Damping,” In: Proceedings of Damping 93, IBB, pp. 1-23.

2. Baz, A. and Ro, J. 1995. “Optimum Design and Control of Active Constrained Layer Damping,” Transactions of the ASME Special 50th Anniversary Design Issue, 117, pp. 135-144.

3. Shen, I.Y. July 1994. “Hybrid Damping Through Intelligent Constrained Layer Treatments,” Journal of Vibration and Acoustics, 116(3):341-349.

4. Shen, I.Y. 1994. “Bending-vibration Control of Composite and Isotropic Plates Through Intelligent Constrained Layer Treatments,” Smart Materials and Structures, 3(1):59-70.

5. Azvine, B. , Tomlinson, G.R. and Wynne, R.J. 1995. “Use of Active Constrained-layer Damping for Controlling Resonant Vibration,” Smart Materials and Structures, 4(1):1-6.

6. Huang, S.C. , Inman, D.J. and Austin, E.M. 1996. “Some Design Considerations for Active and Passive Constrained Layer Damping Treatments,” Smart Materials and Structures, 5(3): 301-313.

7. Liao, W.H. and Wang, K.W. 1997. “On the Analysis of Viscoelastic Materials for Active Constrained Layer Treatments,” Journal of Sound and Vibration, 207(3):319-334.

8. Liao, W.H. and Wang, K.W. 1997. “On the Active-Passive Hybrid Control Actions of Structures with Active Constrained Layer Treatments,” Journal of Vibration and Acoustics, 119(4):563-572.

9. Lesieutre, G. and Lee, U. 1996. “A Finite Element for Beams Having Segmented Active Constrained Layers with Frequency-dependent Viscoelastics,” Smart Materials and Structures, 5(5):615-627.

10.

10. Gandhi, F. May 2001. “Influence of Nonlinear Viscoelastic Material Characterization on Performance of Constrained Layer Damping Treatment,” AIAA Journal, 39(5):924-931.

11.

11. Gandhi, F. and Munsky, B. 2002. “Effectiveness of Active Constrained Layer Damping Treatments in Attenuating Resonant Oscillations,” Journal of Vibration and Control, 8(6): 747-775.

Comparison of Damping Augmentation Mechanisms with Position and Velocity Feedback in Active Constrained Layer Treatments

Abstract

Keywords

Get full access to this article

References