SVIBOR - Project code: 2-10-225


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 2-10-225

Optimisation of merchant ship exploatation

Main researcher: LOVRIĆ, JOSIP (58256)

Type of research: applied
Duration from: 04/30/91. to 12/31/93.

Papers on project (total): 35
Institution name: Pomorski fakultet, Dubrovnik (171)
Department/Institute: Maritime Faculty - Maritime department
Address: ul. Ćira Carića br.4
City: 20000 - Dubrovnik, Croatia
Phone: 385 (0)020 412 811
Phone: 385 (0)020 412 911
Phone: 385 (0)020 32 563

Summary: The optimalization of a merchant ship's exploitation is theprocedure by which the ship's efficiency is to be increased interms of better operability and higher profitability. There aretwo spheres the optimalization refers to: the ship's designing,during which her future characteristics can be influenced, andthe exploitation of the existing ship, whose characteristicscan't be changed, but can be exploited more appropriately. Thisship's efficiency depends on many factors: on the wind and seacondition the ship will encounter, on the exploitation roughnessof a hull and a propeller and on its progression, on the"elasticity" of the propulsion plant and on the extent of"spontaneous" response, on the freigh rate which variesperiodically, on the fuel cost which also varies trough the timeend from port to port, on the reliability, on themaintenance power and expenses of ship's plants and onthe ship's aging. By calculation and model simulations and byresearches on exploiting ships, the occurence and theinfluence of particular factors to the "behaviour" of theparticular type of a merchant ship have been estabilished inorder to form global or partial mathematical model, to define theproject task, based on the sufficient number of preciseparameters, for the design elaboration and decision-making duringthe ships exploitation. The Research was extended to the problem of contamination of coastal waters by nomidigenous sea species by ballast waters and its prevention by treatment of ballast water on board of the ship.

Keywords: ship's exploatation, cost effective decision, exploatation'sroughness, servise margine, aging margine, commercial speed,running tetragon, maintenance power, reliability, redundancy,operability, nallast water, nomindigonous sea species

Research goals: This project is filling the gap between the parameters taken intoaccount when designing a ship and the parameters measured in theconditions of the sea trials on the one hand and real conditionson the other hand, which arise where the ship is being exploited.Therefore, it has been necessary to develop adequatelly adaptedmeasuring device, to determine the methodology of measuring theparameters as well as the parameters themselves and organize thecollecting, delivery and analysis of the results of themeasurment. As the researches are done aboard the vessels in service, whichmakes the research more difficult, a part of the results has beenobtained by symulation, extrapolation and finally by statisticalanalysis and the laws of predictability. The following areas were analysed: 1. The speed of the vessel in relation to the hull form, thetype and the power of the propulsion plant, exploitationroughness of the underwater part of the hull, the wind and seacondition, freight rate, transhipment and storage capabilities,fuel prices, the number and the qualification of the crew as wellas the port dues and norms. 2. Specific and interactional analyses of the vessel's plantswhich has comprised availability, maintanbility, redundancy,operational reliability and reliability with repairs from thepoint of view of the safety and terotehnological process onboard. 3. The analyses of the automation of the ship's propulsionand managing plants, in the aim to establis spontaneity inresponse to the sudden changes in the enviroment. 4. Analysis of the problem of ballast water minimization due to contamination risk of coastal waters by nonindigenous sea specics. The results achieved so far are the following: ad 1.1. Establishing the metod for the calculation of thecondition of "the service mean point" in a ship's life span. 1.2. The affirmation of the notion of "commercial speed" ascontinuous variable and the way of calculating it. 1.3. The discovery of the "running tetragon" as a whole of(commercial) speeds of the vessel and thus non-existency of theone unique speed for the optimalization of the project and themethod (and the program) for the calculation of it. ad 2.1. On the basis of the analysis of the operationalreliability and the reliability with repairs determiningindispensable redundancy in the ship's plants 2.2. Estabilishing the form for the "maintenance powerequation" with the purpose of setting the conveniency betweenvarious projects of the vessels, as well as for theoptimalization of the number and the qualification of the crew. 2.3. Establishing "limit criterion of ship's operability" for thecritical analysis of the complexity and the duration of themaintenance action in the period of the maintenance which shouldbe done within the port, to avoid delay. ad 3. After collecting the results of the research so far donethe analysis of them is being caried out by the methods ofsymulation and the mathematical model is being developed within adoctoral thesis. ad 4. Collecting of bibliography directly from IMO and Australian Quarantine & Inspection Service as well as from relevant Congreses & Symposiums. ad 1,2,3 Determining a new, more complex approach to the projecttask and establishing the methods of the formulation andmathematical checking of it.


  1. Name of project: 2-10-326 Povezivanje jadranskog priobalja pomorskim prijevozom
    Name of institution: Fakultet strojarstva i brodogradnje Zagreb
    City: 10000 - Zagreb, Croatia


  1. Name of institution: Fakultet strojarstva i brodogradnje - Zavod za brodogradnju
    Type of institution: University/Faculty
    Type of cooperation: Joint publishing of scientific papers
    City: 10000 - Zagreb, Croatia

  2. Name of institution: Brodarski institut
    Type of institution: State institute
    Type of cooperation: Systematic exchange of information
    City: 10000 - Zagreb, Croatia


  1. Name: Brodski torziometar "PANDA 2"
    Type of achievement: Prototypes
    Authors: Ljubetić M, Tomašević J, Bosnić A,Pučić V.

  2. Name: Dokumentacija za izradu simulatora za mjerenje torzije "baždarenje mjernog elementa"
    Type of achievement: Technical specifications
    Authors: Bosnić A,Čuvalo M,Tomašević J.

  3. Name: Dokumentacija za izradu simulacijskog torziometra za promjenljiv promjer brodske osovine (vratila)
    Type of achievement: Technical specifications
    Authors: Bosnić A,Čuvalo M,Tomašević J.

  4. Name: Programska podrška za djelomićno integrirano upravljane brodom: "Sailing economy and managment SEAMEN"
    Type of achievement: Technical specifications
    Authors: Bosnić A,Janjić I,Čuvalo M,Pintek D,Parat Ž.

  5. Name: Program za prekrcaj tankera Paloma
    Type of achievement: Other
    Authors: Bosnić A., Jazvić M., Pintek D.

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Last update: 10/10/95