LIMIT commands for a variable area criterion.
Given the following criteria how would I write a limit command to satisfy the
An area under each righting arm curve up to the angle of maximum
righting arm of not less than the area determined by the following
equation: A = 10.3 + 0.187 (30-Y) at max RA.
It takes two consecutive LIMIT commands to handle this criterion:
LIMIT(1) AREA FROM 0 TO MAX AT 15 > 13.1
LIMIT(2) AREA FROM 0 TO MAX AT 30 > 10.3
These are mentioned in the manual under the LIMIT command in the Command
1) These two limits must be consecutive; e.g. 1 & 2 as above.
2) The /LIMIT:COMBINE subparameter must also be used on any RA command
where the two limits are to be evaluated as a single varying limit.
The interpretation is that the limit value is 13.1 when the angle of MAX is at
15°, 10.3 when it is at 30° and a linear interpolation between 13.1 and 10.3
when it is between these angles.
Keywords: Offshore Supply Vessel Criterion, IMO A.469 2.5.2
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