COMPUTATIONAL PREDICTION AND REDESIGN FOR VISCOELASTICALLY DAMPED STRUCTURES

Viscoelastic materials are very effective in suppressing excessive vib rations and noise. The shear modulus of these materials has an importa nt effect on the loss factors of damped structures. However, it change s rapidly with frequency, an effect, which has to be taken into accoun t. This paper presents a method, namely the finite element perturbatio n method, which provides a simple tool for the prediction in a wide fr equency range without repeated analysis. This approach also enables a simplified redesign of damping.