A method of analysis and a computer program were developed for determination of the frequencies and mode shapes of the free vibrations of stiffened cylindrical shells. The shells are stiffened by closely spaced stringers and rings, have different boundary conditions, and are subjected to either a static axial load or a hydrostatic pressure. The stiffeners are considered "smeared" over the shell. The system of equations which was obtained is solved by a method known as the "exact method". The theoretical investigation includes a study of the variation in frequencies and mode shapes with increase in the static load until buckling.
展开▼
