Examination of the intact stability and the seakeeping behaviour

3 Data input
The thesis is written based on vessel data which are available at the institute of ship design
and ship safety. Overall 15 container vessels are examined in this thesis.
Before the calculations and simulations are started, extensive numerical models are generated.
For each vessel a general arrangement plan, a tank capacity plan and a stability booklet are
available. The lines of the ships for all vessels are also available. With these documents enough
technical data are available for the calculation of the seakeeping behavior. In detail, the following
data are entered and/or veried in the E4 software for each vessel which is examined.
3.1 Main Dimensions
All available main dimensions are entered into the system. These are geometrical dimensions
like the length between perpendiculars L P P , the length over all L OA , the breadth B, the depth
to freeboard deck D or the design draft T D . Further entered dimensions worth mentioning, are
the keel thickness and the shell plating factor, which are needed to calculate the cross-curves of
stability as described in chapter 3.8.
3.2 Lines of the ship
For the intended calculations, the utilized model needs to match the original with adequate accuracy.
Therefore the available lines of the ship in E4 are checked and corrected where necessary.
A typical lines plan of one of the examined vessel is shown in gure 3.1.
Figure 3.1: Lines plan of one of the examined vessels
3.3 Lateral areas
The front and side lateral areas also shown in gure 3.1 are entered to be able to include wind
eects in the seakeeping calculations. In addition the side lateral area is very useful to assess the
dimensions of the cuboid for the RAO calculations, as it is explained in chapter 2.1.1.1. Later
on it is decided, not to consider the inuence of the wind on the seakeeping behavior in the rst
step.
13