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        Assessment of the effect of biofilm on the ship hydrodynamic performance by performance prediction method

        Farkas Andrea,Degiuli Nastia,Martić Ivana 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1

        Biofouling represents an important problem in the shipping industry since it causes the increase in surface roughness. The most of ships in the current world fleet do not have good coating condition which represents an important problem due to strict rules regarding ship energy efficiency. Therefore, the importance of the control and management of the hull and propeller fouling is highlighted by the International Maritime Organization and the maintenance schedule optimization became valuable energy saving measure. For adequate implementation of this measure, the accurate prediction of the effects of biofouling on the hydrodynamic characteristics is required. Although computational fluid dynamics approach, based on the modified wall function approach, has imposed itself as one of the most promising tools for this prediction, it requires significant computational time. However, during the maintenance schedule optimization, it is important to rapidly predict the effect of biofouling on the ship hydrodynamic performance. In this paper, the effect of biofilm on the ship hydrodynamic performance is studied using the proposed performance prediction method for three merchant ships. The applicability of this method in the assessment of the effect of biofilm on the ship hydrodynamic performance is demonstrated by comparison of the obtained results using the proposed performance prediction method and computational fluid dynamics approach. The comparison has shown that the highest relative deviation is lower than 4.2% for all propulsion characteristics, lower than 1.5% for propeller rotation rate and lower than 5.2% for delivered power. Thus, a practical tool for the estimation of the effect of biofouling with lower fouling severity on the ship hydrodynamic performance is developed.

      • Integration of UML with Simulink into Embedded Software Engineering

        Tibor Farkas,Emi Meiseki,Carsten Neumann,Kunihisa Okano,Andreas Hinnerichs,Shingo Kamiya 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8

        Today, control algorithms of electronic in-vehicle functions are implemented on various networked control units with different software architectures and designs. Special effort is needed when integrating those artifacts and software components from different sources to overcome the limits of efficient integration of model-based design into the embedded development. This paper focuses on the advantages of model-based development by mixing object-oriented and signal-oriented modeling concepts together and referencing (generated) legacy software components to get an overall software design. Therefore, we present an integration methodology of UML and Simulink modeling concepts to a traditional automotive software engineering process. Furthermore we describe the model-based engineering of a car-door control system as an example.

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