What to converge on Damage Stability?

Hi Mates,

I have a question regarding the damage stability.

I know there are two methods:
- Loss of buoyancy method
- Added weight method

My question is. What do we have to converge on the calculation in order to get the Damage stability right?

Is the iteration to converge the CoG and CoB until they are aligned to each other both for trans and longi positions? is that where you stop the calculations iteration?

 

When conducting a calculation for damaged stability, whether inside out (lost buoyancy) or outside in (added weight), there are additional criteria besides necessary rigid body physics.
1) There is a minimum GM at all stages of flood-up including free surface (c.f. the MV ROCKNES capsize).
2) There is a minimum area under the righting curve for all stages of flood-up. (c.f. MV TRICOLOR)
3) Conservative calculation in either the ever-buoyant volume or the Permeability

 

By calculating the intact stability at any loading condition you calculate the equilibrium floatation, for which you also need to compromise on the exact positions of both points. Use the same accuracy in damage stability calculations.

 

Yes, the whole idea of Center of Permeability is fraught with issues.