Abstract
A theoretical and experimental study is presented for the damping of circular plates by constrained viscoelastic layers when only a concentric portion of the plate is covered. For the flexural vibration of the plates, the equations of motion are derived by treating the in-plane displacements of the base and constraining layers as being independent, and by taking account of the in-plane force and displacements of a homogeneous part. The solutions of the equations of motion are given in a form of superposition of the solutions of the flexural vibration and the static in-plane deformation. Loss factors are determined by evaluating strain energies. Both theory and experiment show that partial coverage can give almost as much damping as full coverage.
