Sea Technology

MAR 2018

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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12 ST | March 2018 The voyage simulation approach establishes the operational profile of the vessel and the weather con- ditions under which it can safely, comfortably and most profitably operate. It includes any design or operation decision that affects fuel consumption and comfort on board in the same analysis, and requires formal responses from designers to operational questions that, at their very core, may formerly have been considered of either indeterminate factor or even background noise. These are questions such as: When is the best time to cruise the South Pacific; do we need to make the vessel bigger to extend the operat- ing season; what should this itiner- ary's departure and arrival times be; what combinations of engines do we really need; and how long will it take to return to port if we lose one propeller? Even if the design is fixed, the use of voyage simulations will give owners a much more realistic pic- ture of the operational capability of the vessel than previously possible. The operability analysis can also be easily updated throughout the entire design process as the design changes and new performance data become available. The model can be tuned further as data from onboard systems are compiled from the op- eration of the vessel. This feedback from operations will help in the de- cision-making process during future newbuild and conversion projects. In fact, this is the most valuable de- sign data you can get and should be used in future designs. By using operational data from a reference vessel, i.e., similar type ship as the new design, the opera- bility analysis methods can be cal- ibrated with existing data for the reference ship and applied more accurately in the new design. Is- sues such as marine growth, for ex- ample, have a significant effect on the fuel consumption, but depend on the route and cleaning sched- ule for the hull. These are data best obtained from real operational ex- perience. Through the integration of real performance data in the oper- ability analysis, a much more real- istic assessment of the new vessel's performance can be made. Then the vessel design can be optimized not only for the actual environmental conditions but also for the way the vessel is expected to be operated. A number of Foreship's well- known cruise ship clients have ex- pressed interest in Foreship's new operability analysis service, and at least two have sanctioned a full- scale operability study as part of new construction projects. These operability studies are in the early stage, and follow up of the perfor- mance model will be conducted over time. Because operability analysis en- ables seeing the effects of chang- es more easily, it is easier to make changes and optimize ship design. This will result in a better ship in the end because operability analy- sis can be used to give practical and accurate answers about the effect early design decisions will have on the fuel consumption and comfort of a vessel. ST Matthew Patey is a project manager at Foreship. He has been with Foreship for five years, concentrating on ship behavior in waves and hydrody- namics in general. Pri- or to joining Foreship, he was with the soft- ware company Napa Ltd. for 12 years, where he was responsible for the offshore and hydro- dynamic aspects of the NAPA system for ship design. "Feedback from operations will help in the decision-making process during future newbuild and conversion projects. In fact, this is the most valuable design data you can get."

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