Original scientific paper

Nonlinear restoring stiffness of triangular tension leg platforms

Ivo Senjanović ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana Lučića 5, 10000 Zagreb, CROATIA
Marko Tomić ; University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Ivana Lučića 5, 10000 Zagreb, CROATIA
Smiljko Rudan ; 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

Abstract

A new stiffness matrix for nonlinear dynamic analysis of triangular TLPs is formulated utilising both the equilibrium of forces and energy balance approach for arbitrary surge, sway and yaw. Static numerical analysis is performed for a triangular TLP, ordinarily used as a benchmark in the relevant literature, by imposing surge force and yaw moment. In order to validate the new stiffness formulation, the obtained results are compared with those determined by an FEM analysis. Some shortcomings of the traditionally used stiffness matrix are pointed out.

Keywords

triangular tension leg platform; nonlinear stiffness; force equilibrium approach; energy balance approach; FEM

Hrčak ID:

201709

URI

https://hrcak.srce.hr/201709

Publication date:

21.12.2017.

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