Examination of the intact stability and the seakeeping behaviour

4.3 Vessel No. 03
ˆ The documented bilge keel area is signicantly higher than the mean value according to
chapter 3.9.
ˆ The stability in ballast arrival loading condition is very high resulting in a
GM solid = 10.12 m.
ˆ The limiting intact stability criterion (Max. GZ at 25 ◦ ) requires a GM min = 2.63 m.
The calculated transversal accelerations on the bridge and the rolling angles for the three accident
conditions are listed in table 4.6.
Table 4.6: Results of the seakeeping calculation for Vessel No. 03
Accident
[
a
situation t max m/s
2 ] ϕ max [ ◦ ]
Situation 1 10.5 26
Situation 2 11.0 23
Situation 3 11.0 30
The maximum acceleration occurs for accident situation 3, but the accelerations are comparable
for each accident situation.
Even though Vessel No. 01 and Vessel No. 03 are very similar, the values are smaller for
the Vessel No. 03. A possible reason for this dierence is the 60% larger bilge keel area of
Vessel No. 03 and therefore a higher roll damping, respectively. The accelerations in accident
situation 2 and 3 are the same. Therefore the situation of both with the higher rolling angle is
stated to be the worst situation. The statistical distribution of the transversal accelerations in
this situation is shown in gure 4.6.
Figure 4.6: Transversal acceleration on the bridge of Vessel No. 03 in accident situation 3
23