Title Utjecaj hrapavljenja oplakane površine na eksploatacijska svojstva broda
Title (english) Effects of wetted surface roughness on ship performance and economics
Author Branko Belamarić
Mentor Vedran Žanić (mentor)
Committee member Izvor Grubišić (predsjednik povjerenstva)
Committee member Vedran Žanić (član povjerenstva)
Committee member Vladimir Andročec (član povjerenstva)
Committee member Boris Antolić (član povjerenstva)
Committee member Ivan Juraga (član povjerenstva)
Granter University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Zagreb
Defense date and country 2008-03-05, Croatia
Scientific / art field, discipline and subdiscipline TECHNICAL SCIENCES Shipbuilding Constructive of Floating and Maritime Structures
Universal decimal classification (UDC ) 629.5 - Watercraft engineering
Abstract Veliki je broj čimbenika okoliša i deteriorativnih uvjeta u službi broda koji utječu na sposobnost održanja brzine broda u određenom vremenskom periodu. Utjecaj hrapavosti oplakane površine iznimno je važan za poslovanje broda. Ispitivanjem utjecaja oplakane površine na brzinu i snagu, dokazano je da se hrapavost brodova u službi godinama stalno povećava. Stoga se smanjuje brzina, odnosno zahtijeva veća snaga za održanje izvorne brzine. Postupkom višeatributne sinteze, primijenjene kao optimizacijske metode za kreiranje projekta poslovanja broda, čija je programska aplikacija razvijena na Fakultetu strojarstva i brodogradnje u Zagrebu, razvijeni su i objedinjeni slijedeći modeli: - model porasta otpora, pomoću ITTC 1978 formule za izračunavanje dodatka na hrapavost, - ekonomski model vezan za analizu prihoda i rashoda poslovanja, - ekološki model vezan za ispuštanje biocida iz antivegetativnih premaza, - model obrade supstrata tj. oplakane površine vezane za radove u doku, Projektni problem definiraju tri cilja, temeljena na različitim kriterijima: - ekonomski kriterij (zarada- profit brodovlasnika), - ekološki kriterij (stupanj zagađenja-dinamika izlučivanja biocida iz AV premaza, - kriterij društvene koristi (dostupnost-maksimalni broj putovanja). Kreiranje triju ciljeva provedeno je primjenom računalne simulacije i optimiranjem postupka održavanja površine trupa variranjem svih operacija čišćenja i premazivanja, vezano na performanse i ekonomske efekte, u ovisnosti o brzini broda, optimalnim intervalima dokiranja, planiranim troškovima goriva i drugih relevantnih troškova u luci i plovidbi. U programu su inkorporirane i varijable stupnja onečišćenja luka i izlučivanja toksičnih supstanci iz AV premaza kao i postupak pjeskarenja oplakane (čelične) površine. Izborom triju strategija, vezanih za kvantum izlučivanja biocida iz antivegetativnih premaza, rad artikulira ekološke efekte unutar eksploatacijskog života broda. Primjenom prikazanih modela, analizirana je strategija poslovanja jednog Suezmax tankera kao primjer optimizacijske procedure s Pareto rješenjima. Prikazani alternativni višekriterijalni program za ocjenu predviđanja poslovanja broda predstavlja unaprijeđenu metodologiju koja s dovoljnom točnošću može poslužiti brodovlasniku pri optimiranju strategije poslovanja.
Abstract (english) There are a large number of environmental and deteriorative factors related to the operation of a ship which affect its ability to maintain speed over a period of time. The impact of hull roughness on the economics of ship operations is significant. Investigating the influence of underwater hull surface roughness on speed and power have indicated that the ships become measurably rougher each year they are in service. The increased roughness either slows them down, or demands more fuel for a given speed. Based on computer programme application, developed at Faculty of Mechanical Engineering and Naval Architecture in Zagreb, to create a ship operation policy strategy optimisation thru multiattribute synthesis procedure, the following models are applied: - a friction resistance model based on ITTC 1978 formula, - income/expenses economy model, - antifouling paint biocide leaching ecology model, - wetted surface treatment model. Three attributes based on different criterions, determine general concept design, namely: - economy criterion i.e. profit, - criterion for the pollution of the environment i.e. biocide emissions from antifouling coatings, - accessibility criterion i.e. number of voyages. Said attributes are calculated thru computer simulation and optimisation of hull surface management practices is described including variation of optimum hull cleaning and coating schedules, and their attendant ship performance and economic benefits, with respect to ship speed, optimum docking intervals, fuel and all other relevant voyage/port cost projection, port fouling severity, biocide emission from antifouling coatings, wetted (steel substratum) surface blasting procedure. Environmental effects of three biocide emissions alternative strategies from antifouling coatings conceptual choices during entire life span of the ship are demonstrated. Based on aforementioned models data, the Suezmax Tanker operation policy strategy is analysed as an example of optimisation procedure with Pareto solutions. The applied alternative approach to multicriterial decision making process in ship operation policy procedure presents an improved methodology with a reasonable reliability in terms of procedure accuracy for Shipowner strategy management optimisation policy purposes.
Keywords
hrapavost substrata
otpor trenja
antivegetativni i antikorozivni premazi
obraštaj
Keywords (english)
hull roughness
friction resistance
anticorrosive and antifouling coatings
fouling
Language croatian
URN:NBN urn:nbn:hr:235:153028
Study programme Title: Mechanical Engineering and Naval Architecture Study programme type: university Study level: postgraduate Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resource Text
File origin Born digital
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Created on 2020-12-01 07:33:43