Hi,
This is my last year in university, I am a naval architecture student and currently working on project about how the width of the Ro-ro ship's void compartment affect their probabilistic damage (Attained index) using Maxsurf.As far as i know, the dimension of the compartment and tank affect the number of Attained index. But the problem occured when i did the analysis of a ship with two different width of compartment, the result of Attained index remains the same.I have attached some images of my compartmentation, loadcase and damage analysis settings. Do i missed something?Thanks
Hi Arnan,
Here are some things to try:
- Check the visualisations available:
- Are your damage zones in the correct places? (Display | Damage Zone / Extents)
- Are the damage cases as you expect. Copy the prob. cases into the deterministic cases so that you can view each ones damage tanks, GZ curve etc. (Case | Copy Prob Damage Cases)
- Check that the Prob. Damage cases are being created correctly. When in the Damage Spaces or Prob. Damage Cases tab, go to Case | List Prob Damage Cases
- Is the difference between your models in an internal space? Your settings currently only damage one zone, does the internal space ever get damaged?
Regards,
James
Answer Verified By: Arnan Abdurrofi
- Yes i have already created the damage zones based on the software "damage extent" menu. But i don't really know how maxsurf choose the damaged compartment. Is it based on SOLAS damage length equation or what? Or do i need to input the damaged compartment manually?- How to check the GZ of each case (deterministic). How to run the analysis of deterministic damage stability on maxsurf?- Yes the difference is in the internal spaces of the ship. With 1 damage assumption the result remain the same, with 2 or more it changes slightly.
Hi Arman,
The issue with Probilisitic Damage is that we can't visualise what is happening in the vessel during each analysis case because they are all batched together. However, MAXSURF has the ability to copy all of the probabilistic cases into standard (deterministic) damage cases.
The standard (Determinsitic Cases) can be visualized, you can look at the heel, trim and flooding at each heel angle, assess the GZ curve etc. If there is an error in your model, this should help you identify it.
Copying probabilistic cases to deterministic cases only duplicates information. Your probabilistic damage cases will still be there. You can either delete the new cases afterwards, or not save the changes (save under a new name)
To do it:
- Go to the Probabilistic Damage Cases tab or the Damage Window.
- In the menu Select Case | Copy Prob. Damage Cases
- click OK to the warning message
- Randomly select some damage cases and run them.
Things to look for are:
- Features on the GZ curve that aren't expected (peaks, crossings etc.)
- How the flooding of compartments occurs during the analysis.
- Any trimming or other problems you don't expect to see.
This is difficult without you posting your model. Are you sure that your model is all correct?
- Have you checked all of your sections are formed correctly?
- Are your intact loadcases gving the results expected?
Is the entire volume of the hull defined as compartments and tanks?
- any space that isn't defined can't be flooded
Hi james i have one query regarding Limiting KG of probabilistic damage stability how to get ...?switching from Probabilistics damage section to Limiting KG, it not showing damage case limiting KG................................ Any criteria problem