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Article

Comparative Analysis of Linear and Non-Linear Programming Techniques for the Optimization of Ship Machinery Systems

1
Department of Mechanical Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
2
Deltamarin, 00210 Helsinki, Finland
3
ENEA—Italian National Agency for New Technologies, Energy and Sustainable Economic Development, 40129 Bologna, Italy
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2019, 7(11), 403; https://doi.org/10.3390/jmse7110403
Received: 16 September 2019 / Revised: 6 November 2019 / Accepted: 7 November 2019 / Published: 8 November 2019
(This article belongs to the Special Issue Modelling and Optimisation of Ship Energy Systems)
The selection of a proper machinery system is one of the primary decisions to be taken during the ship design phase. Nonetheless, this selection is made challenging by the presence of a variety of alternatives, and by the limited data availability at the early stages of the design phase. An optimization framework is presented in this paper, supporting decision making at the earliest stages of the ship design process. The framework is suitable to perform the screening and the selection of optimal machinery configurations for a predefined ship operational profile, and it includes both linear and non-linear optimization routines. The results of the linear and the non-linear approaches are compared, and indications on what conditions are the most suitable for the application of one or the other approach are provided. Both approaches are tested for two case studies, a bulk carrier and a small cruise ship. The results indicate that both optimization approaches lead to the same layout of the machinery system, but to slightly different unit scheduling. This suggests that the use of the linear approach is suitable for design purposes, but less appropriate for operational optimization. In addition, the findings of the work suggest that the trade-off between fuel consumption and volume of the engines should be considered when selecting the machinery system for a ship. View Full-Text
Keywords: optimization; ship energy system; low carbon shipping; linear programming; genetic algorithm optimization; ship energy system; low carbon shipping; linear programming; genetic algorithm
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MDPI and ACS Style

Baldasso, E.; Elg, M.; Haglind, F.; Baldi, F. Comparative Analysis of Linear and Non-Linear Programming Techniques for the Optimization of Ship Machinery Systems. J. Mar. Sci. Eng. 2019, 7, 403. https://doi.org/10.3390/jmse7110403

AMA Style

Baldasso E, Elg M, Haglind F, Baldi F. Comparative Analysis of Linear and Non-Linear Programming Techniques for the Optimization of Ship Machinery Systems. Journal of Marine Science and Engineering. 2019; 7(11):403. https://doi.org/10.3390/jmse7110403

Chicago/Turabian Style

Baldasso, Enrico; Elg, Mia; Haglind, Fredrik; Baldi, Francesco. 2019. "Comparative Analysis of Linear and Non-Linear Programming Techniques for the Optimization of Ship Machinery Systems" J. Mar. Sci. Eng. 7, no. 11: 403. https://doi.org/10.3390/jmse7110403

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