Abstract
This paper presents an analytical method of flexural vibration of a beam with partial coverage of a constrained viscoelastic layer. The problem of discontinuity of the neutral axis at the connecting point between the multi-layer and homogeneous parts which arises in the method used so far, is solved by treating the axial displacement of a base layer and that of a constraining layer as being independent, and by taking the axial force and displacement of a homogeneous part into consideration. Frequencies and loss factors of beams whose base layers are clamped at both ends are calculated numerically by use of the present method and the usual method. Experimental values are also presented and compared with calculated results. An a results, damping properties of partially covered beams are clarified, and it is found that the usual method can be used practically in many cases.
