Review article
Restoring Stiffness in the Hydroelastic Analysis of Marine Structures
Ivo Senjanović
; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana Lučića 5, 10000 Zagreb, Croatia
Neven Hadžić
; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana Lučića 5, 10000 Zagreb, Croatia
Nikola Vladimir
; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana Lučića 5, 10000 Zagreb, Croatia
Abstract
The restoring stiffness, that couples displacements and deformations, plays very important role in hydroelastic analysis of marine structures. The problem of its formulation is quite complex and is still discussed in the relevant literature. In the paper, the recent formulations of restoring stiffness are correlated and analyzed. Due to some equivalent terms of the restoring and geometric stiffness as a result of common load, the unifi ed stiffness is established and compared with the
complete restoring stiffness known in the relevant literature. It is found out that the new formula deals with more terms, and, that under some assumptions, it is reduced to the known complete restoring stiffness. The unifi ed stiffness constitution is analyzed through derived analytical formulae for prismatic pontoon. Its consistency is checked for the rigid body displacements. Also, numerical results of the hydroelastic response of segmented barge are correlated with available model test
results. Some issues, that are important for practical implementation in the hydroelastic code for fl exible structures, are described.
Keywords
geometric stiffness; hydroelasticity; restoring stiffness; segmented barg
Hrčak ID:
72275
URI
Publication date:
30.9.2011.
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