Similarly, trim is controlled by constraints (5.29), where the parameter set
X ds
represents approximated longitudinal distances of a slot to the midship. Negative values
for slots located at the aft of the midship, positive for slots ahead of midship. The effect
of the moment from cargo must at all times keep within the range of
,
MAX MAX
M M t t
.
Constraints (5.30) make sure that the maximum allowable vertical distance
MAX Z
from
the ship’s bottom deck to the ship’s centre of gravity when loaded, is not exceeded.
Constraints (5.31) work in a similar way, but as a limit to the minimum distance from the
ship’s bottom deck to the laden centre of gravity. The limits
MAX M
r
,
MAX Mt
, and
MAX Z
and
MIN Z , will all be discussed in the next section.