Examination of the intact stability and the seakeeping behaviour

6 Detailed examination
Table 6.1: Stability data for the small vessel
Ballast arrival loading
Value Unit
condition
KM 15.46 [m]
KG 8.48 [m]
GM solid 6.98 [m]
Light ship Value Unit
vcg LSW 12.18 [m]
16
14
Maximum transverse acceleration on the bridge [m/s 2 ]
12
10
8
6
4
2
Ballast arrival loading condition
0
2 4 6 8 10 12 14 16
GM solid [m]
Accident situation 1 Accident situation 2 Accident situation 3
Figure 6.1: Vessel No. 13 in ballast arrival oating condition: Variation of GM solid
6.1.2 Midsized vessel
The midsized vessel for the detailed stability analysis is Vessel No. 1. Its relevant data are listed
in table 6.2. More main data of this vessel can be found in the appendix A.1 on page 59. The GM
is varied around the ballast arrival GM solid = 10.43 m within a range of about GM ∼ = 5 ... 13 m.
In gure 6.2 the resulting transversal accelerations on the bridge are shown related to the
varied GM solid values. All three accident situations result in a comparable curve slope. On
average the highest accelerations occur for a GM in the range of the GM solid within the ballast
arrival loading condition. It is very mentionable, that the vessel would also experience lower
transversal accelerations on the bridge, even when the stability is further increased. Though just
a GM solid value of about 11 m is realistically reachable for this vessel by e.g. lling tanks in
low positions. Again, higher GM values are only realisable by changing the vertical center of
gravity of the lightship weight. When reducing the stability by decreasing GM, the transversal
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