Abstract
Work has been carried out to determine the characteristics of damping of extended vibrating systems by partial coverage, or “patches,” of treatment. The present study has extended earlier work [J. Acoust. Soc. Am. 33, 861(A) (1961)] and has established some criteria for the most effective use of these patches. In particular, the concept of damping efficiency has been used to measure damping effectiveness; thus, the damping of a system (relative to that for full coverage) may be evaluated as the product of the partial-coverage ratio and the efficiency. We have considered a system (beam or plate) having a one-dimensional, standing flexural wave of the form A cos kx. Both free and constrained viscoelastic layers of treatment are discussed. Curves of efficiency vs patch length are presented for constrained-layer patches for various values of shear parameter and loss factor of the viscoelastic material. Also, curves are presented which specify the optimum patch position. Experimental results are also discussed. [Supported by the U. S. Navy, Bureau of Ships Contract NObs 78799.]
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