Abstract
To face the design of a new ship concept, the evaluation of multiple feasible solutions concerning several aspects of naval architecture and marine engineering is necessary. Compressed natural gas technologies are in continuous development; therefore, there are no available databases for existing ships to use as a basis for the design process of a new unit. In this sense, the adoption of a modern multi-attribute decision-based method can help the designer for the study of a completely new ship prototype. A database of compressed natural gas ships was generated starting from a baseline hull, varying six hull-form parameters by means of the design of experiment technique. Between the attributes involved in the concept design process, stability is for sure one of the most relevant topics, both for intact and damaged cases. This work describes two approaches to identify the compliance of a ship with the intact stability regulations based on the ship main geometrical quantities. Moreover, a metamodel based on the maximum floodable length concept (damage stability) allows determining the main internal subdivision of the ship. The metamodel outcomes were compared with results from direct calculations on a ship external to the database, highlighting the adequate accuracy given by the developed methods.
Highlights
The design process of a ship is a complex issue that faces many aspects of naval architecture and marine engineering, varying from hull-form development to ship’s production
It has been decided to reproduce the GZ curves instead of the KN curves for intact stability, in such a way to have inside the database the KG variations necessary to evaluate a compact model for damage stability according to floodable lengths
Applying the procedure reported in Section 3.1.2 to the Compressed Natural Gas (CNG) ship database, a set of regression coefficients was determined for the intact stability models and the damaged stability ones
Summary
The design process of a ship is a complex issue that faces many aspects of naval architecture and marine engineering, varying from hull-form development to ship’s production. It is necessary to adopt a modern design approach starting from the first feasibility studies, involving multi-attribute decision-making (MADM) strategies [1] To this end, it should be possible to evaluate the ship’s primary attributes through mathematical metamodels in terms of the ship’s main geometrical parameters. Intact stability requirements were considered to build a metamodel suitable to predict quickly and accurately the stability characteristics of a large number of ships during a MADM process by means of multiple linear regression (MLR) technique directly on the righting arm curves. To this end, multiple options have been tested and compared with each other. To evaluate the reliability of the proposed method, a comparison is provided between the developed models and direct calculations on a ship external from the database
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