What can be done in the way of design,evaluation and verification - for owners, operators, agents, shipyards, consultants?
Seakeeping performance - motions, accelerations, operability, regularity
Seakeeping performance affects:
Unsuitable hull forms or incorrect distribution of cargo will usually result in delays, cancellations or severe motions. In the worst cases, extreme vessel response can lead to passenger and crew injuries, movement of cargo, or damages to the ship's structure and equipment.
Direct computations provide relevant information about ship performance in a seaway, including physically realistic simulations of ship-wave problems. Anti-roll fins, rudders, tanks and moving masses may be included in the calculations. Typical situations considered are:
Such analyses will answer questions about:
Wave-induced loads, local slamming loads
Global dynamic loads are caused by:
Motions of the ship in rough weather can lead to structural problems
Our calculations can provide answers about:
Loads from these analyses can be used in structural analyses as an alternative to classification design values of global loads (shear forces, bending moments, torsional/pitch moments), and can also indicate potential problem areas.
Structural analysis - fatigue and ultimate limit states from seakeeping analyses
The results from the hydrodynamic calculations may be used to calculate:
Either of the following different approaches may be used, with improving accuracy:
Long-term statistical results are obtained by postprocessing transfer functions from the vessel response calculations. This predicts possible fatigue damage, and estimates yielding, tearing and buckling capacities.