Critical pressure-frequency characteristics analysis for ring-stiffened submerged conical shells

Abstract

[Objectives] In order to reveal the physical mechanism of the numerical simulation of the critical pressure of the underwater ring-stiffened conical shell and compare the accuracy of the experiment methods,[Methods] based on Flügge shell theory, wave propagation method and Galerkin method are used to study the relationship between critical pressure and natural frequency of underwater ring-stiffened conical shells. The smeared stiffener theory is substituted into the shell vibration equation in the ring-stiffener so that the natural frequency and the critical pressure are calculated.[Results] The study shows that the square of the natural frequency of the underwater ring-stiffened conical shell decreases linearly with the hydrostatic pressure increases, the critical pressure of the ring-stiffened conical shell increases when the elastic modulus, thickness and height of the ring stiffener increase.[Conclusions] The calculation method is accurate, effective and easy to use. It can provide a new method and idea for the nondestructive prediction of the critical pressure of the underwater ring-stiffened conical shell.

Keywords

• ring-stiffened conical shell
• theory of Fl&#252gge shell
• wave propagation method
• critical pressure
• Galerkin method