Study on vibration characteristics of cylindrical sandwich tube with lattice core

Abstract

In this study, the natural frequency of cylindrical sandwich tube with lattice core has been investigated using FEM. In particular, the effects of geometric properties, for example the ratio of diameter to length, unitcell size and facesheet thickness on the natural frequency were discussed. It is revealed that the minimum natural frequency can be predicted from the conventional shell and beam theory for a continuum material. Also, when the tube behaves like a beam, the natural frequency can be estimated with a good accuracy regardless of geometries. Furthermore, when the tube is relatively short, the natural frequency can be estimated by considering rotary inertia and shear deformation.