Seakeeping  and  Maneuvering

The seakeeping qualification of ships and other floating structures in rough seas are studied either experimentally in a wave tank or analytically using existing extensive computer codes. Thus, one can determine quantitatively whether a ship or a floating structure satisfies criteria as: passenger comfort, crew effectiveness, operational characteristics (for naval or other special ships) and strength of the ship structure.

 

The Ship Model Towing Tank is equipped with a modern wavemaker that can create realistic sea states. Seakeeping experiments are performed underway in head or following seas, with measurements of:  vertical motion and acceleration along the ship, deck wetness, bow slamming and propeller emergence. At zero speed and beam seas, damage stability tests are performed as prescribed by the “Stockholm Agreement”.

 

All ship responses (motions, velocities and accelerations) can be predicted using analytical tools for any sea state, ship speed and heading angle.

 

Maneuvering characteristics and rudder efficiency are determined using large remote-controlled models in lakes or protected sea areas. The model trajectory is measured using state-of-the-art, real time, and satellite-assisted systems. The rudder angle is also simultaneously recorded. Thus, all maneuvering trials prescribed in the ship acceptance trials, can be performed, leading to the redesign of the rudder system, when necessary.

Finally, the Laboratory has recently acquired expensive instrumentation and plans to offer in the near future unique services with large models (7 to 12m) at sea and around a directional wave buoy.