Krutost pritegnutih platformi

Senjanović, Ivo and Hadžić, Neven and Tomić, Marko and Vladimir, Nikola (2012) Krutost pritegnutih platformi. = Stiffness of tension leg platforms. In: IV Savjetovanje o morskoj tehnologiji in memoriam akademiku Zlatku Winkleru, 25-26.11.2011., Rijeka, Hrvatska.

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Abstract (Croatian)

Pritegnuta platforma spada u tip podatljivih pomorskih konstrukcija koje se koriste za istraživanje nafte u dubokom moru. Usidrena je vrlo fleksibilnim pritegama koje omogućuju relativno velike amplitude zanošenja. Trup platforme smatra se krutim tijelom sa šest stupnjeva slobode gibanja. U dinamičkom odzivu pritegnute platforme važnu ulogu ima ukupna povratna krutost. Iako u literaturi postoji nekoliko formulacija povratne krutosti, nijedna od njih nije potpuno adekvatna, pri čemu je osnovni problem realistične definicije centra rotacije. U ovom radu prikazana je konzistentna formulacija matrice krutosti, izvedena iz općeg rješenja za hidroelastičnu analizu brodskih konstrukcija, kao poseban slučaj. Ukupna krutost pritegnute platforme u dinamičkoj analizi sastoji se od hidrostatičke krutosti trupa (s komponentama gravitacijske sile i sile vanjskog tlaka), te konvencionalne i geometrijske krutosti pritega. Analizirane su i obrazložene razlike između nove i od prije poznatih formulacija krutosti.

Abstract

The tension leg platform (TLP) is a type of compliant offshore structures generally used for deep water oil exploration. It is moored by very flexible tendons so that surge amplitude can achieve large value. The platform hull is considered as a rigid body with six d.o.f. The total restoring stiffness plays very important role in the TLP dynamic behavior. Although there are several stiffness formulations available in the present literature, none of them is completely adequate. The issue is to define realistic centre of rotations. The consistent formulation of stiffness matrix is presented in this paper. It is derived from the general solution established for hydroelastic analysis of ship structures, as a specific case. Actually, the total TLP stiffness in dynamic analysis consists of hydrostatic hull stiffness (pressure and gravity), and conventional and geometric tendon stiffness. The new stiffness is compared to the known ones, and discrepancies are analyzed and discussed.

Item Type:	Conference or Workshop Item (Lecture)
Uncontrolled Keywords:	pritegnuta platforma, povratna krutost, geometrijska krutost
Keywords (Croatian):	Tension leg platform, Restoring stiffness, Geometric stiffness
Subjects:	TECHNICAL SCIENCE > Shipbuilding
Divisions:	600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design 600 Department of Naval Engineering and Marine Technology > 650 Chair of Marine Machinery and System Design
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Date Deposited:	23 May 2016 11:34
Last Modified:	11 Oct 2016 11:05
URI:	http://repozitorij.fsb.hr/id/eprint/5928

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