Polu-spregnuta analiza dinamičkog odziva plutajućeg tijela i sidrenih linija pritegnutih pučinskih platformi

Tomić, Marko and Senjanović, Ivo and Ćatipović, Ivan (2014) Polu-spregnuta analiza dinamičkog odziva plutajućeg tijela i sidrenih linija pritegnutih pučinskih platformi. = Floater-tether semi-coupled dynamic response analysis of tension leg platforms. In: XXI. simpozij Teorija i praksa brodogradnje, in memoriam prof. Leopold Sorta = The 21st symposium Theory and practice shipbuilding, in memoriam prof. Leopold Sorta, 02-04.10.2014., Baška; Croatia.

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Abstract (Croatian)

Matematički model nespregnutog dinamičkog odziva plutajućeg tijela i sidrenih linija pritegnutih pučinskih platformi (pritegnute plutajuće platforme, plutajuće pučinske vjetroturbine) unaprijeđen je uzimajući u obzir nelinearnu povratnu krutost kao posljedicu utjecaja sidrenih linija na dinamiku plutajućeg tijela. Osim nelinearne povratne krutosti model na jednostavan način uzima u obzir i inerciju i viskozno prigušenje prednapregnutih sidrenih linija što rezultira računalno efikasnim poluspregnutim matematičkim modelom. Točnost modela ocjenjena je na primjeru ISSC TLP-s usidrenog u moru srednje dubine usporedbom s potpuno spregnutim modelom konačnih elementa (teorija štapa) koji uzima u obzir deformacije prednapregnutih sidrenih linija. Analiza točnosti modela uključuje analizu statičkih pomaka i slobodnog njihanja plutajućeg tijela. Simulacija u vremenskoj domeni provedena je preslikavanjem linearnih hidrodinamičkih sila iz frekvencijske u vremensku domenu pomoću Cumminsovog konvolucijskog integrala, pri čemu je hidrodinamička reakcija određena programom HYDROSTAR. Neki važniji rezultati i zaključci navedeni su u radu.

Abstract

Mathematical model for the uncoupled floater- tether dynamic response analysis of floating tethered bodies (e.g. Tension Leg Platforms, Floating Offshore Wind Turbines) is extended to account for the nonlinear restoring stiffness due to the influence of mooring lines on the floating body dynamics. Also, a simple approximation of the inertia and viscous effects of tethered mooring lines is also taken into account resulting in a computationally inexpensive semi-coupled floater- tether mathematical model. Model is validated in the case of ISSC TLP in medium range depths using the fully coupled FEM model (theory of rod) taking into account tethered mooring lines deformations. Validation analysis includes static displacements and free decay tests. Time domain simulation is done by mapping linear frequency domain hydrodynamics to time domain using the Cummins integral approach, utilizing the HYDROSTAR potential flow code to determine the hydrodynamic reaction forces. Some useful results are presented and discussed.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: poluspregnuta analiza; nelinearna povratna krutost; vremenska domena; pritegnuta pučinska platforma
Keywords (Croatian): semi-coupled analysis; nonlinear restoring stiffness; time domain; tension leg platform
Subjects: TECHNICAL SCIENCE > Shipbuilding
TECHNICAL SCIENCE > Mining, petroleum and geological engineering
Divisions: 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
600 Department of Naval Engineering and Marine Technology > 630 Chair of Ship Design and Offshore Technology
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 15 May 2015 09:45
Last Modified: 17 Oct 2017 13:46
URI: http://repozitorij.fsb.hr/id/eprint/4160

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