Abstract: The performance of constrained layer damping treatments can be enhanced by optimizing the segment length or through active control by inducing strains in the constraining layer. This paper investigates the effect of these methods on the flexural and extensional modes of a ring over a wide frequency range. Finite element models are first verified experimentally and then used in parametric studies. It is shown that segmentation of the constraining layer does not increase the maximum damping obtainable for a particular configuration but alters the mode number at which the maximum occurs. It is also shown that the optimum viscoelastic layer stiffness for active constrained layer damping is higher than that for the passive case. !18
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