Title Dinamička analiza spuštanja podvodne strukture Title (english) Dynamic analysis of subsea structure deployment Author Srđan Pletikapa Mentor Marko Valčić (mentor)Mentor Jasna Prpić-Oršić (komentor)Committee member Albert Zamarin (predsjednik povjerenstva)Committee member Marko Hadjina (član povjerenstva)Committee member Tin Matulja (član povjerenstva)Committee member Dunja Legović (član povjerenstva)Committee member Marko Valčić (član povjerenstva)Granter University of Rijeka Defense date and country 2020-09-24, Croatia Scientific / art field, TECHNICAL SCIENCES Abstract Ovaj rad se sastoji iz dva dijela. U prvom dijelu su opisane sve faze koje prolazi odobalna struktura
od same izrade na kopnu, do njene instalacije na odobalnoj lokaciji. Poseban naglasak je stavljen
na transport i instalaciju odobalne strukture. Struktura, čiji su transport i instalacija objašnjeni u
okviru ovog rada, koristi se prilikom priključivanja novih proizvodnih platformi na postojeći
cjevovod. U okviru drugog dijela provedena je dinamička analiza u vremenskoj domeni za
odobalnu operaciju spuštanja spomenute strukture. Na osnovu rezultata dinamičke analize
izabrana je optimalna pozicija krana DLB-a, te pripadajuća granična stanja mora pri kojima je
moguće sigurno obavljati odobalnu operaciju spuštanja strukture. Dinamička analiza je provedena
pomoću računalnog programa Orcaflex, tvrtke Orcina. Sam diplomski rad je izrađen u suradnji s
odjelom NAVAS, tvrtke SAIPEM S.p.A. Rijeka.
Dodatno je, na enciklopedijskoj razini, obrađena teorijska pozadina modeliranja parametara
okoliša i odziva plovnog objekta. Također je obrađena metodologija provedene analize, te su
iznesene osnovne karakteristike upotrijebljenog računalnog programa Orcaflex. Kao mjerodavna
su korištena pravila DNV-GL-a kao nadležnog klasifikacijskog društva.
Na osnovu provedenih rezultata dinamičke analize može se zaključiti da su, prilikom spuštanja
podvodne strukture, dominantna opterećenja koja se javljaju uslijed interakcije strukture i valova.
Gibanje DLB-a je imalo manji utjecaj na sile koje se javljaju u opremi za podizanje tereta. Uz
pretpostavku da sustav za sidrenje DLB-a, kompenzira gibanja drugog reda.
Abstract (english) The thesis consists of two parts. The first part, which generally describes all undergoing phases
during subsea structure deployment. From the fabrication of the offshore structure to its
installation. Transport and installation procedures were more in-depth explained. The structure
analyzed in the thesis is used to connect the new offshore structure to the existing pipeline. The
second part of the thesis dealt with dynamic analysis in the time domain for structure lowering
operation. Based on analysis results, the optimal DLB crane position is chosen and allowed sea
states were defined. The software used for dynamic analysis was Orcina’s Orcaflex. The thesis
itself was done in collaboration with the NAVAS department of Saipem S.p.A. branch office in
Rijeka.
Additionally, on a general level, the theoretical background of environmental loads modeling and
floating object motion is given. The methodology of analysis is given, together with some general
descriptions of Orcaflex characteristics and possibilities. All criteria used were according to DNV
GL and Saipem S.p.A. internal procedures.
Based on the results of dynamic analysis, we can say that during offshore structure lowering, most
dominant loads were from structure-wave interaction. DLB motion had a smaller influence on
loads in rigging equipment. Naturally, it is assumed that DLB's second-order motions are
compensated with the mooring system.
Keywords
nelinearna dinamička analiza u vremenskoj domeni
valno opterećenje
odobalne operacije
odziv broda
pomorstvenost
spuštanje teških tereta
Orcaflex
procjena graničnih stanja mora
transport i instalacija odobalne strukture
Keywords (english)
nonlinear dynamic analysis in time domain
wave loads
offshore operations
ship response
seakeeping
lowering of heavy cargos
Orcaflex
evaluation of weather limits
transport
and installation of offshore structure
Language croatian URN:NBN urn:nbn:hr:190:334240 Study programme Title: Graduate University Study of Naval Architecture Type of resource Text File origin Born digital Access conditions Access restricted to students and staff of home institution Terms of use Created on 2020-12-16 10:38:14
