When I do the Large Angle Damaged Stability Calculation for a few damage cases where starboard side is damaged, I get failure in the Result though margin % is positive. I get this error for the damage of a few tanks. When the damage is in the starboard side but vessel is heeled to port side, I get this error. But for many other starboard tank I don't get this error. The same error happens for the same damaged condition but in port side and if I heel the vessel in starboard direction. Could you please tell me why is this happening? Is it a problem? I cross checked many times. I see , doing the equilibrium analysis, that1. Heel angle at equilibrium in intact condition is zero in Intact Condition2. Heel angle at equilibrium in Damaged Condition is 0.1. 3. I see that Latest version of Maxsurf has Heel side direction options in the criteria settingsI am confused why is this problem occurring?
Hi, Due to change some settings or something I once got Pass in the criteria which were showing failure earlier. However, I am not sure how I have got this. Could you please precisely tell me how to do this and is it okay to do this? Is there any hidden feature that needs to activate?
Hi Ku Ru,
I think the proper fix here is to heel the vessel in the opposite direction (Analysis | Heel and check the Heel to Port box)
Technically, we should only allow this to pass if the equilibrium angle is positive. We do have a small threshold so that a vessel that is slightly negative equilibrium will still pass. My suspicion here is that your vessel is just on that threshold.You could test by:
- Show the maximum decimal places by holding the shift key whilst clicking on Help | About MAXSURF Stability.
- Test your model and shift the TCG slightly (i.e. edit your lightship TCG) to see if small changes will make the vessel pass / fail.
Regards,
James