FREE OSCILLATIONS OF A RING-REINFORCED, SHEAR-DAMAGED CYLINDRICALSHELL IN CONTACT WITH VISCOELASTIC SOIL AND FLUID

Abstract

The system we studied consists of a cylindrical shell reinforced with discretely distributed
ribs made of viscoelastic, orthotropic material in contact with viscoelastic soil. The incisions are
rectangular in shape and located in a section divided by rings, as shown in Figure 1.
To study the oscillations of this system, we will use the full energy of the viscoelastic,
orthotropic perforated cylindrical shell reinforced with ribs, as well as the work done in the
displacements of the points of the cylindrical shell and the contact conditions added to them.
However, the total energy of the system is carried not over the entire surface, but over the ,
surface, where is the cross-sectional area. It should be noted that the liquid is located
inside the cylindrical shell, while the soil is located outside. The liquid is considered ideal, while the
soil is considered viscoelastic.