Abstract
Constrained layer damping (CLD) treatments, wherein a viscoelastic sheet is sandwiched between a structural sheet or plate and a covering or constraining sheet, are widely used to suppress vibration and noise. Techniques for predicting the damping loss factor for such a construction include the Ross-Ungar-Kerwin (RUK) complex modulus technique [1] (which is only applicable when the treatment completely covers the structural sheet), the Modal Strain Energy Method [2] and the Analytical Power Input Method [3].
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