Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Acanfora, Maria; Altosole, Marco; Balsamo, Flavio; Micoli, Luca; Campora, Ugo

doi:10.3390/jmse10010036

Cited by 13 publications

(9 citation statements)

References 41 publications

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“…The proposed relationships are suitable for the static approach also in the early stage design when only the main vessel characteristics are known. In literature, it is possible to find specific formulations for the wind load 25 and the current loads, 26,27 and comparable results have been found in a previous analysis.…”

Section: Dynamic Positioning Problemsupporting

confidence: 69%

Probabilistic operability and greenhouse gas assessment during dynamic positioning operations

Fruzzetti,

Donnarumma,

Maggiani

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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A Dynamic Positioning system automatically maintains both the position and heading of a vessel by using its thrusters in the presence of external disturbances. This goal is ensured by a controller that compensates for the environmental disturbances and computes the proper set-points for each actuator. The core of such a system is composed of force and thrust allocation modules that tailor the required forces and moment over the available actuators. The propulsion systems used are often over-actuated and the thrust allocation algorithm implies an infinite number of solutions since it is impossible to solve analytically the problem. Over the years efforts from the research community dealt with the optimization in terms of accuracy, energy consumption, and maintenance with innovative allocation strategies were investigated. However, no publications or rules indicate the procedure for the evaluation of exhaust gas emission during dynamic positioning operations. For such a reason, the paper aims to develop an optimization procedure that includes an ad-hoc objective function with relative non-linear constraints for the thrust allocation logic that tends to minimize the actuators’ thrust. The procedure accounts for non-linear hydrodynamic effects on the thrust generation, including thruster-thruster and thruster-hull interactions, to obtain the most realistic results as possible. Moreover, following the IMO suggestions, the production of greenhouses gases emissions is evaluated in probabilistic terms. The proposed approach provides indicators in terms of yearly operability, fuel consumption, and environmental footprint during dynamic positioning operations that could be used for proper decisions in ship deployment.

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Section: Dynamic Positioning Problemsupporting

confidence: 69%

Probabilistic operability and greenhouse gas assessment during dynamic positioning operations

Fruzzetti,

Donnarumma,

Maggiani

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…The simulation process is based on the resolution of the thermodynamic cycle of the engine, where the fuel combustion is modeled by Wiebe equation [16,17]. By this approach, it is not possible to achieve a reliable estimation of the main polluting emissions; however, this method allows for better management of the code computation, as well as its easier integration into a complete simulation of the ship's motions [29].…”

Section: Methodsmentioning

confidence: 99%

Simulation Analysis of a Methanol Fueled Marine Engine for the Ship Decarbonization Assessment

Altosole,

Balsamo,

Campora

et al. 2024

Energies

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Methanol as marine fuel represents one of the most cost-effective and practical solutions towards low-carbon shipping. Methanol fueled internal combustion engines have a high level of technological readiness and are already available on the market; however, technical data in terms of fuel consumption and emissions are not yet easily accessible. For this reason, the present study deals with the simulation of a virtual spark-ignition methanol engine, carried out in a Matlab-Simulink© R2023a environment to assess the CO2 emissions in several working conditions of a possible ship power system. The thermodynamic model of the methanol fueled engine is derived from a marine gas engine simulator, already validated by the authors in a previous work. This article presents the relevant modifications necessary to adapt the engine to the methanol fuel mode with regard to the different fuel characteristics. The simulation analysis compares the results of the virtual methanol engine with available data from a similar, existing gas engine, highlighting the differences in efficiency and carbon dioxide emissions.

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“…The compressor mass flow rate can be subsequently calculated using the above non-dimensional parameters, according to equation (23). 55 _…”

Section: Turbocharger Modelmentioning

confidence: 99%

Health assessment framework of marine engines enabled by digital twins

Tsitsilonis

Theotokatos

Patil

et al. 2023

International Journal of Engine Research

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The advancements in digital twins when combined with the use of the machine learning tools can facilitate the effective health assessment and diagnostics of safety critical systems. This study aims at developing a framework to address the health assessment of marine engines utilising digital twins based on first-principles. This framework follows four distinct stages, with the former two including the marine engine digital-twin set up by customising the required thermodynamic models, as well as its calibration using tests trials data representing the engine healthy conditions. In the third stage, measurements from actual operating conditions are corrected and subsequently employed to develop the digital twin representing the prevailing conditions. The fourth stage deals with the engine health assessment by assessing health metrics derived from the developed digital twins. This framework is demonstrated in a case study of a large marine four-stroke nine-cylinder propulsion engine. The results demonstrate that three cylinders are identified to be underperforming leading to an average increase of the engine Brake Specific Fuel Consumption (BSFC) by 2.1%, whereas an average decreases of 6.8% in Indicated Mean Effective Pressure (IMEP) and 6.1% in the Exhaust Gas Temperature (EGT) are exhibited for the underperforming cylinders across the entire operating envelope. The developed digital twins facilitate the effective mapping of the engine performance for the entire operating envelope under several health conditions, providing enhanced insights for the current engine health status. The advantages of the proposed framework include the use of easily obtained data, and its application to several engine types including two and four-stroke engines for both propulsion and auxiliary use.

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Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Cited by 13 publications

References 41 publications

Probabilistic operability and greenhouse gas assessment during dynamic positioning operations

Probabilistic operability and greenhouse gas assessment during dynamic positioning operations

Simulation Analysis of a Methanol Fueled Marine Engine for the Ship Decarbonization Assessment

Health assessment framework of marine engines enabled by digital twins

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