19022

Time-Domain Analysis of Sandwich Shells with Passive Constrained Viscoelastic Layers

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Damping effects on THE vibration behavior of a sandwich cylindrical shell wit~ a. passive constrained viscoelastic layer are investigated in the time-domain. Equations of motion In terms of transverse modal coordinates in the frequency-domain are obtained by means of an energy method and the Lagrange equation, and they are solved by the assumed-mode metho~. The viscoelastic behavior is represented by the frequency complex modulus model. The equations of motion are transferred from the frequency-domain to the time-domain by the Inverse Fast Fourier Transform, (IFFT). Thickness effects of constrained and viscoelastic layers are i~ves~igated by a transient external load response and evaluation of the damping factor and settling time.

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