Finite element free vibration analysis of stiffened plates

Abstract

SummaryFree vibration characteristics of stiffened plates possessing symmetrical stiffeners have been investigated by the finite element method. The main elegance of the element used lies in that the formulation takes into account the arbitrary orientation of a stiffener inside the plate element. The element being isoparametric in nature caters effectively for the irregular edges of the boundary as well as the transverse shear deformation of the plate and the stiffeners. Rectangular and skew stiffened plates having various boundary conditions and with stiffeners varying in number and in spacing, have been analysed. The correlation of the natural frequencies obtained by the present approach with the published results have been found to be very good.

Identification of stiffness and damping of the weld in stiffened plates using model updating

“…A limitation in this element was that the stiffeners could be located only along the nodal lines. For stiffened plates within ship structures, a multi-rib isoparametric element [12,13] was developed to incorporate arbitrarily oriented stiffeners, which could be placed even through the middle of an element. This element had several advantages such as accommodating irregular boundaries and skewed shapes, along with the inclusion of transverse shear and bending deformations without shear locking phenomena [14].…”