Operability assessment
General information
A detailed assessment of the operational performance is obtained by completing the hydrodynamic characteristics with a detailed description of the expected climate (wind, waves, swell) and an operational scenario with related criteria for tolerable behaviour. The target is a quantitative assessment of the performance in terms of e.g. comfort, workability, schedule reliability and fuel consumption.

Services & Activities
The traditional performance assessment visualizes the operational limits in a wave scatter diagram. The program WASCO performs this analysis for the basic motions and a large variety of derived aspects for a given speed and heading. It’s successor, WASCO2000, accounts for non-linear roll and the maximum sustained speed.

Although the traditional performance analysis is still widely used, scenario simulation tools, in which a mission is mimicked hundreds of times in a step-wise approach, find increasing application. The SAFETRANS code was developed to simulate trans-ocean voyages. A more basic derivative, the GULLIVER code, is used for less general problems. Scenario simulations account for the persistence of wind, waves and swell and their directions as well as the details of complex operational scenarios, including prudent seamanship. The results give insight in for instance:

  • The relation between service margin and the frequency of delays
  • The impact of prudent seamanship on the reliability of the schedule
  • The relative magnitude of calm water drag, wind drag and added resistance in waves
  • The merits of specific sailing strategies to increase reliability or reduce fuel consumption
Using local, coastal, wave hind cast results it becomes possible to quantify the risks of vulnerable near-shore operations in great detail.

Facilities & Tools
Operability studies are performed with the following tools:

Software Sales
Some software tools are available for commercial use outside MARIN. A complete overview of these software tools for sale can be found under Software Sales.

Experience
The list below gives a review of operability assessments with GULLIVER:

  • Fin stabiliser performance on 8100 TEU container vessel, Pacific and Atlantic (Rolls Royce, 2006)
  • 700 GT Long Liner, North Pacific (Ching Fu Shipbuilding, 2005)
  • RoRo, Northern Europe (Damen Shipyards, 2004)
  • Airbus A380 transport, Northern Europe (Airbus, 2004)
  • Fast container carrier, North Atlantic (CRS, 2004)
  • LNG carrier, North Atlantic (IZAR, 2004)
  • Queen Mary 2, North Atlantic (Chantiers de l'Atlantique, 2002)
The list below gives a review of operability assessments with SAFETRANS:

  • Flare boom transport, Far East to Europe (SMOE, 2004)
  • Drilling vessel, Gulf of Mexico to Europe (BP Turkey, 2004)
Most recent Operability assessment papers presented by MARIN:
(complete overview of papers can be found under Publications)

OBELICS JIP successfully achieves goals
Ron Schoon & Eelco Frickel, MARIN Report, 2013

First images of cavitation and ventilation in waves
Gerco Hagesteijn & Joris Brouwer, MARIN Report, 2012

LAURA Phase 2 gets underway
Frans Kremer, MARIN Report, 2012

Live testing of fatigue predictions for USCG
Ingo Drummen, MARIN Report, 2012

MARIN gets to grip with the elusive Human Factor
Wendie Uitterhoeve, MARIN Report, 2011

Most recent Operability assessment articles written for MARIN Report:
(complete overview of articles can be found under Publications)

OBELICS JIP successfully achieves goals
Ron Schoon & Eelco Frickel, MARIN Report, 2013

First images of cavitation and ventilation in waves
Gerco Hagesteijn & Joris Brouwer, MARIN Report, 2012

LAURA Phase 2 gets underway
Frans Kremer, MARIN Report, 2012

Live testing of fatigue predictions for USCG
Ingo Drummen, MARIN Report, 2012

MARIN gets to grip with the elusive Human Factor
Wendie Uitterhoeve, MARIN Report, 2011

Contact
For more information on how MARIN can help your organisation with operability assessments, please contact:

Ships Seakeeping Department

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