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2 TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2 2025

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Enhanced Predictive Diagnostics for Naval Equipment: Integrating MYT Decomposition for Advanced Process Monitoring

Boullosa-Falces David, Sanchez-Varela Zaloa, Lavin Egoitz Urtaran, Sanz David Salvador, Garcia Sergio

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2025

Vol. 19 No. 2

543--548

The competitiveness in maritime operations demands maintenance strategies that ensure high reliability and availability at minimal cost. While predictive diagnostics have shown promise in detecting deviations from optimal operating conditions, current methodologies often fail to effectively isolate and identify the contributing process variables. This study introduces an enhanced predictive diagnostic approach that integrates MYT (Mason, Young, Tracy) decomposition with traditional statistical monitoring techniques, such as Hotelling's T² control charts. By applying this methodology to the auxiliary systems of a 284-meter LNG tanker, we identified that the key variables driving process anomalies were Superheated Steam in Boiler 1 (Tn/h) and Superheated Steam in Boiler 2 (Tn/h). These findings underscore the ability of the proposed method to detect deviations before critical failures occur, providing ship operators with actionable insights to enable precise maintenance scheduling, reduce operational costs, and prevent unscheduled downtime. The demonstrated integration of MYT decomposition into predictive maintenance protocols highlights its potential to optimize monitoring accuracy and decision-making in complex naval systems.

CFD Analysis of Cobalt-Based Ceramic Coatings for Energy Optimization in the Fishing Naval Industry

Sanz David Salvador, García Sergio, García Javier, Boullosa-Falces David, Trueba Alfredo

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

2025

Vol. 19 No. 2

553--560

The rising cost of fossil fuels has created a significant economic challenge for the fishing fleet, whose performance heavily relies on marine diesel consumption. The increase in operational costs due to fuel price surges negatively impacts the profitability of ships, particularly in the fishing industry, where profit margins are often tight. Given this issue, it is crucial to explore solutions that reduce fuel consumption without compromising the operational efficiency of ships. In this context, cobalt-based ceramic coatings, designed and tested in accordance with the ASTM-D3623 procedure, emerge as an innovative and promising alternative. These coatings reduce biofouling adhesion, a buildup of marine organisms on the ship’s hull that increases frictional resistance to movement, consequently leading to higher fuel consumption. By decreasing hydrodynamic resistance, ships require less energy for propulsion, thereby optimizing fuel consumption. Additionally, these coatings provide anticorrosive protection, extending the service life of ships and reducing maintenance costs. The cobalt-based coating has been tested under controlled laboratory conditions and subjected to hydrodynamic shear forces representative of ship navigation at a speed of 10 knots. This article evaluates via CFD the impact of these coatings on the drag resistance of a trawler ship, demonstrating that the increase in hull roughness due to biofouling adhesion on the cobalt-based ceramic coating after one month of navigation results in a 0.02% increase in drag. In contrast, the Intersleek 1001 coating leads to a 6.35% increase in drag under the same conditions.