Numéro : 2470 - Year : 2006
Some aspects of a military surface ship project
Yannick BIAN, DCN Ingénierie – Lorient (France)
Gilles HAMMER, DCN Ingénierie – Lorient (France)
Daniel MALETTE, DCN Ingénierie – Lorient (France)
Foreign orders for military ships are not common and the level of international competition is very high. Thus DCN international offers must be at their highest level in terms of cost and technical performances. Performance predictions are to be as reliable as possible in order to verify them at sea. It should be noted that these performances are submitted to financial penalty clauses that may lead to the refusal of the ship.
For all these reasons, it is absolutely necessary to have correct precisions in order to predict the ship’s performances. This precision can be obtained firstly thanks to a design process that is adapted to the different steps of the programme and secondly, from the return of experience from the units that have already been built. From this point of view the prediction of military ship performances is more difficult than for merchant ships because of the much smaller number of units that are built and the specificities of military ships such as: integration of military appendages (sonar…), specific stability criteria (3 flooded compartments), acoustic discretion constraints, resistance to military shocks, design of the hull for two ship speeds: maximum speed and autonomy, confidential aspects of programmes.
The hydrodynamic design process of a frigate class surface ship is described in this document. Performance prediction steps are detailed as well as the correlation of prediction with sea trial results are then analysed from speed, manoeuvrability, cavitation and seakeeping points of view.
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