Parametric Resonance of Stiffened Rectangular Plates

Abstract

This investigation is concerned with the onset of parametric instability of a simply supported stiffened rectangular plate subjected to in-plane sinusoidal dynamic forces. An analytical analysis is developed for the stiffened plate with the stiffeners treated as discrete elements. The results show that the location and size of the stiffeners have a significant effect on the location and contour of the boundaries of the parametric instability regions when compared with those of a flat unstiffened plate. Experimental verification is obtained for stiffened plates with a single centrally located stiffener transverse to an in-plane periodic force acting on two opposite edges.