Feature 1 | FEATURE THEME
e 2 | RO-RO TECHNOLOGY Building to IMPROVE standards
An innovative concept of a large ro-pax vessel is one of three new ship designs emerging from the EC-backed IMPROVE project.
S
upported by the European Commission, the three year ‘IMPROVE’ ship design research
project is approaching the half-way stage in its bid to deliver a rationale for making decisions pertaining to the design, production, and operation of three new ship generations. Coordinated by ANAST, University of
aircraft seats; crew 200 persons. This design was developed in cooperation with Siemens Schottel and Sea Trade fr pods behind two skegs.
The main dimensions of the second stage ‘new ship’ have already been defined, with optimisation achieved using T obtain minimal main engine power and sufficient stability. A new application has been developed, which finds a b order to achieve minimal resistance. After resistance calculation, it was decided that this ‘level 2’ ro-pax would ha and active rudder as auxiliary propulsion. The auxiliary propeller is to be driven by a direct electric drive of 5000 k bottom of the leg (inside circular torpedo body). Planetary gears for steering are driven by frequency controlled ele Here, the original hull form was Uljanik's biggest PCTC, which was then transformed into new (level 2) form. In c design would need almost 7000 kW less power, while the weight of machinery would be reduced by 450tonnes, fu and finally, the propulsion system is characterised as more reliable. The index of redundancy is 100% (two indepen independent propulsion systems).
Liege, IMPROVE involves 17 partners, including Aker Yards of France, Uljanik shipyard of Croatia, Szczecin New Shipyard of Poland, owners Grimaldi, Exmar, and Tankerska Plovidba Zadar, Bureau Veritas, two ship design companies, two engineering companies, and two soſtware companies, as well as WEGEMT (European Association of Universities in Marine Technology and Related Sciences). Te team hopes that the project’s results
The main characteristics of this level 2 ship are: length overall - abt 193 m; length between perpendiculars - 180 m block coefficient – 0.53; trial speed – 24.5knots; main engine power – 14940kW; active rudder output – 5000kW. With 18 months of the project to run, the full ‘stage 3 IMPROVE project ship’ has yet to emerge, although it is alre 500tonne reduction in steel contentM oever the forerunning design, and that the propulsion solution will feature a nov skeg and single pod configuration, working in combination with two stoke engines.
will help the European shipbuilding industry to claw back market share it has lost to yards operating on a lower labour cost base, such as those in China. IMPROVE aims to use advanced
is the key tool. OCTOPUS is an integrated ship structural modeling, analysis, and optimisation system for the conc The project is currently in the model integration phase (IMPROWE WP5), so the most important tasks, developme expected most important design goals are: 4% less lightship mass, 8% more lane meters on tank top, 9.5% less po mass, 4.5% less fuel oil consumption, 5-10% less cost of maintenance, 10-15% more operational efficiency, 8% le
The ropax structural design process requires number of tools like MARS, HYDROSTAR, MAESTRO and COSM improvement in operational performance
synthesis and analysis techniques at the earliest stage of the design process, considering structure, production, operational performance, and safety criteria on a concurrent basis. Te ship types are new generations of LNG gas carriers and chemical tankers and, as the focus of this article, an innovative concept for a large ro-pax vessel.
a ship with a maximum length of slipway ≈ 230m, and maximum breadth given as 30.40m. From the owner’s point of view, the new vessel will be developed for diterranean Sea operations
and
general design requirements including: load carrying flexibility; a perceptible
and efficiency when compared to existing ships; design for the redundancy and simplicity of systems; an increase in ship’s manoeuvrability; optimised sea-keepi g performance; maximised comfort and
optimised to improve the hydrodynamics, while a slow-speed main engine has been pre-selected to improve maintenance and consumption. The criteria also dictate: minimum height of deck transverses; an improvement in design using existing and improved tools for early design phase; rule calculation – simplified CAD modelling, leading to simplified FEM and LBR5 modelling; minimum weight of freeboard deck transverses; minimum height of deck No3 and deck No4 transverses; accurate calculation at the early design stage of building tolerances and deformation constraints; superstructure decks effectiveness in the longitudinal strength to be considered; web frame spacing and longitudinal spacing to be optimised, while there are to be no pillars in cargo space.
‘Standard Ship’, the existing ship or yard prototype.
designed several car-carriers, con-ro, and ro-pax vessels for different shipowners. Its enduring association with Grimaldi provides the bedrock for the development of the new ro-pax vessel, whose evolution has already gone through general and structural analysis. Te shipbuilder has performed extensive multi-objective structural optimisation of a ro-pax structure using OCTOPUS-MAESTRO software, with a view to developing a ship design promising minimum cost, minimum weight, and maximum safety measures, while also satisfying structural constraints: yielding, buckling, displacements, and ultimate strength of hull girder and ship panels. Meanwhile, large operational savings are predicted due to a novel propulsion concept. Te main dimension criteria envisage
develop a ro-pax ship taking into account large variations in seasonal trade (summer 3000pax, winter 100pax). Te monohull ship is to feature a superstructure constructed of steel or composite (no aluminium). Ultimate vessel dimensions are to be
Over recent years, Uljanik Shipyard has
minimised vibrations. Tere is also a specific requirement for
an 8% increase in carrying capacity (lane metres) on the tank top, to be achieved by decreasing the length of the engineroom. Tis involves developing a ‘pre-formed’ new design for the stern part of the ship. Uljanik’s design objectives are to
Standard ship. 28
The Naval Architect April 2008
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