The energy flow analysis in stiffened plates of marine structures

The transmission of vibrational energy flow in stiffened plates is analyzed by the structural intensity method. Three typical cases for ship and marine structures are selected as examples: a plate with one longitudinal stiffener under lateral area pressure excitation, a longitudinally stiffened plate under point force excitation, and a cross-stiffened plate under inplane pressure excitation. The relationships between structural intensity and structural mode shapes and the effects of stiffeners on the changes of energy flow in plate are discussed. Finally, the potential application of structural intensity technique towards the design for stiffened plates of marine structures is explored and presented. (C) 2004 Elsevier Ltd. All rights reserved.