An integrated methodology for the Design of Ro-Ro passenger ships

Apostolos Papanikolaou, Evangelos Boulougouris, George Zaraphonitis

CHALLENGE - The present paper provides a holistic approach to ship design, defines the generic ship design optimization problem and demonstrates its solution by use of advanced optimization techniques. Assuming a specific set of requirements a ship needs to be optimized for cost effectiveness, for highest operational efficiency, highest safety and comfort, for satisfactory protection and minimum environmental impact.

SOLUTION -  A set of software tools for the parametric design and evaluation of ROPAX vessels has been developed and linked to multi-objective optimization software modeFRONTIER to form an integrated ship-design methodology performed within the commercial ship design software NAPA. The developed methodology was applied to the design and optimization of three ROPAX vessels: ship 1: 500 passengers, ship 2: 590 passengers, and ship 3: 1300 passengers. Following a ship owner's perspective, the NPV (Net Present Value) was used as sole objective function. This is a complex criterion, encompassing the building and operational costs, as well as the annual revenues. The complete 3D models of the steel structure of the three vessels were developed using the Tribon Hull software by the collaborating Elefsis shipyards.

BENEFITS - Suitable macros have been developed for the design of the vessel's hull form, internal layout and the preliminary structural design evaluation. To further increase the effectiveness of the developed procedure, the parametric ship design application has been linked to modeFRONTIER, facilitating the design space exploration in a rational and efficient way. In ship 3, the design with maximum NPV (41.0 m€) was found within 8 generations.