Marko Hadjina

Shipyard production cost structure optimisation model related to product type

Establishing a shipbuilding production cost structure is a fundamental management activity, concerning materials and fabrication. Shipyards compete in world market niches regarding vessel type and dimensions. Therefore, the vessels market price has a tremendous influence on the shipyards determination of the price of the vessel offered to buyers. For this reason, shipyard management is forced to concentrate its efforts on production cost structure optimisation in order to achieve the goal of a profitable shipyard. In this paper, a computer-integrated cost structure optimisation model for defining an optimal and profitable vessel production cost structure is presented. Statistical analysis of the data was performed for a sample of tankers, built in selected shipyards. Probabilistic theory was applied and several results, such as expectation for aggregate figures, are presented. Such a tool for obtaining an optimal production cost structure enables shipyard management to carry out more effective decision-making, and also better cost control within model parameters. Furthermore, dynamical control of costing figures for the whole shipbuilding process is possible and has a significant influence on the final results. The mathematical model for achieving an optimal structure of the production costs was verified and tested against a real example of the construction of tankers.

DFP analiza izrade robotiziranih međuproizvoda u brodogradnji

The shipbuilding industry belongs to one of the most complex manufacturing industries in the world. During the last couple of decades efforts were made to achieve optimal production, with minimal waste and maximum results of the final product – a ship. In order to allow for this type of manufacturing approach it is necessary to modernize the production processes of a shipyard on a regular basis by following world trends in shipbuilding. Investments in the advancements of assembly lines is a key and primary move towards achieving savings. In the industrial world there is a constant goal of automation and robotization of assembly processes since the degree of achieving this goal is still not satisfactory. Based on this reason the facilities of most shipyards are still only partially automated and roboticized, which means that there is still a large percentage of manual work. This paper analyzes the fallbacks of the assembly processes of a specific shipyard with the aim of providing insight into the realistic possibilities of optimizing the assembly phase of shipbuilding.

Influence Analysis of Deck Equipment Positioning on Performances in Sailing

Authors in this paper presented the analysis regarding influence of deck equipment positioning and trimming, which is directly connected with sails, on sailing yacht performance in sailing. The analysis is performed by on-field measuring during sailing using specialized equipment based on RaceQs application and GPS support. The analysis is related to light wind conditions without significant waves, then to moderate wind and waves and finally to storm wind and high waves. Data collecting was performed during 30 hours of measuring and monitoring where the relevant equipment was continuously repositioned and trimmed aiming to reach more boat speed for different sailing angles. The results are processed and presented. The research was enabled with help and support of Bavaria Yachts d.o.o. Further analysis is suggested for different wind conditions and sea states.