Damping of stiffened plates by multiple layer treatments |
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Authors: | DIG Jones |
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Institution: | Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio 45433, U.S.A. |
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Abstract: | It is shown in this paper that the modal damping and resonant frequencies of a stiffened plate structure, with a multiple layer constrained damping treatment attached to the surface, can be predicted from a knowledge of the equivalent complex modulus properties of the treatment. The equations used represent a simple extension of the classical equations of Oberst for a free layer treatment applied to an unstiffened beam or plate, with terms accounting for the effect of the stiffeners. The equivalent complex modulus properties of the treatment depend on a shear parameter, a geometrical parameter, the stiffness of the constraining layer and the loss factor of the adhesive. Experimental results are discussed. |
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