Page 14: of Maritime Reporter Magazine (March 2016)

EYE ON DESIGN

Accurate Calculation Models for

Maneuvering Simulation

FRANS QUADVLIEG

Example of a ship being tested with the use of MARIN’s computerized planar mo- The ? ve methodologies to obtain maneuvering simulation tion carriage. This methodology works for model sizes between 2 and 10 meters. models for surface ships raditionally, simulation mod- to ships for which there is already a lot of tion models has been a long-term de- els are based on forces mea- information available, the methodology velopment at MARIN and recent results sured during (captive) model is reliable and the results can be used for show that these methods work well. [1]

Ttests. However, over the past feasibility studies. • Captive model tests have been used decades, more methodologies have be- • Semi-empirical methods are using since the 1960s. Over the last years, come available. hull, rudder and propeller data to de- MARIN has been investigating quasi-

MARIN strives to have all these meth- termine maneuvering properties. These stationary tests, which has led to an ef- odologies in-house and up-to-date. The methodologies have more ? exibility: un- ? ciency gain [2]. preferred methodology to determine a conventional ship hulls can be addressed By having many technical possibilities maneuvering model is dependent on the for example, at least as long as the shape in the portfolio, as well as insight into required accuracy for the study, the risk of the hull is not too far from the data the applicability and validity, MARIN and the reliability of the prediction for on which the semi-empirical method is can objectively recommend the best way the ship type. Additionally, the environ- based. to obtain a simulation model to its cus-

The Author ment and time schedule of the customer • Free running model tests are a well- tomers.

are important considerations. The fol- known and highly reliable way of ob-

Frans Quadvlieg is Senior Project Man- lowing methodologies are used to arrive taining maneuvering trajectories. In the ager for the Ships department of MARIN, [1] ‘Review of the SIMMAN2014 Workshop on at simulation models for surface ships. latest development, a simulation model the State of the Art of Prediction Techniques for the Maritime Research Institute Nether- • The database method uses existing, is created by improving a semi-empirical

Ship Manoeuvrability’, Quadvlieg lands. trusted simulation models and scales co- method by system identi? cation using

E: [email protected] [2] ‘Instationary Captive Model Tests’, Hall- ef? cients to arrive at a new simulation the results of the free running tests.

mann & Quadvlieg, MARSIM 2015

W: www.marin.nl model. When the target ship is very close • CFD use for maneuvering simula- 14 Maritime Reporter & Engineering News • MARCH 2016

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