Fast-time Simulators
General information
Fast-time simulations are designed for quick and cost effective studies using the fast-time simulation program SHIPMA. This program is a joint development of MARIN’s nautical centre MSCN and WL| Delft Hydraulics. The combined contribution of these institutes leads to a fit for purpose program to simulate the manoeuvring behaviour of vessels in ports and fairways.

In SHIPMA the vessels are steered by an auto-pilot which is capable to operate in the track keeping mode and in the harbour manoeuvring mode, making it capable to perform typical harbour manoeuvres like turning, reverse sailing and berthing. The program SHIPMA can be used for commercial use.

SHIPMA
SHIPMA simulations give insight into the inherent possibilities and/or restrictions of vessels, infrastructure and environmental conditions including the effect of additional manoeuvring devices like bow- and stern thrusters and the role of tugs. Based on the insights gained, mitigations, if needed, of the infrastructure design (channel layout, manoeuvring basin and terminal layout) and/or the admittance policy or operational procedures can be proposed. In the final stage of the design the SHIPMA study can be followed up by a study on a full-mission bridge to take the human factor into account.

SHIPMA relies on the use of an autopilot, which also includes a tug allocation algorithm. The choice for using an auto-pilot rather than hands-on steering by a pilot or master allows the user to clearly judge and compare the results of different simulations on technical and physical aspects. The use of an automatic pilot in desktop simulation assures repeatability and a consistent nautical assessment procedure. In case a hands-on methos is used, as often seen in other models (actively steering the ship over a chart displayed on a screen) would put the user in a position where he is in fact playing the role of a pilot or master. Alternatively one could ask a pilot to do the runs, but the chart display offered to him is far away from his normal sailing practice that will jeopardise the results of the manoeuvres. Furthermore runs have to be repeated to guarantee consistency. Therefore SHIPMA is very useful in the first design steps of a design study.

The mathematical ship models, consisting of sets of hydrodynamic derivatives (Abkowitz type), are specific for each ship. They are determined either by scale model test, through scaling from other models or by calculation (SURSIM). Models can be chosen from an existing list of over 100 high quality ship models covering the latest ship designs. Specific models can be made according to the client’s wishes. The models include wind coefficients; bank suction coefficients, 2nd order wave drift forces and shallow water effects.

The following articles provide additional information on the use of SHIPMA:

Sales
Besides SHIPMA some other tools are available for commercial use outside MARIN. A complete overview of these tools for sale can be found under Sales.

Contact
For more information about fast-time simulation studies or SHIPMA sales, please contact the department MSG.

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