Different Results in different version of Maxsurf Stability

Dear Altruists,

I have checked the probabilistic damage stability for the same vessels in two different versions of Maxsurf Stability. However, I  have got different results, i.e., attained indexes were different. 

Stability 20.00.02.31, build: 31 shows very low A, whereas Stability 21.11.00.84, build: 84 shows a better-attained index. Which one should I consider correct? 

Please help.

Thanks. 

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  • Hi NA Maruf,

    We do constantly make changes to the software which does include bug fixes and enhancements. You can check the release notes to see if there are any changes that might affect these results (https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-announcements-forum)

    The first things to check here is that you are comparing like for like:

     - In both models, confirm that the hydrostatic sections are formed correctly.

     - In both models, confirm that some basic analyses such as Large Angle Stability and Upright Hydrostatics give the same results. This would tell you if there was a change in model inputs such as the geometric shape of the vessel or the load cases.

     - Confirm your Global inputs are the same

     - Confirm that your heel and trim settings are the same (Analysis | Heel and Analysis | Trim). As an example, damaging the starboard side but rolling the vessel to port may give much improved outcomes.

    If you still can't spot the issue then please submit a Service Request with your files for me to take a look at.

    Regards,

    James

Reply
  • Hi NA Maruf,

    We do constantly make changes to the software which does include bug fixes and enhancements. You can check the release notes to see if there are any changes that might affect these results (https://communities.bentley.com/products/offshore/f/maxsurf-moses-sacs-announcements-forum)

    The first things to check here is that you are comparing like for like:

     - In both models, confirm that the hydrostatic sections are formed correctly.

     - In both models, confirm that some basic analyses such as Large Angle Stability and Upright Hydrostatics give the same results. This would tell you if there was a change in model inputs such as the geometric shape of the vessel or the load cases.

     - Confirm your Global inputs are the same

     - Confirm that your heel and trim settings are the same (Analysis | Heel and Analysis | Trim). As an example, damaging the starboard side but rolling the vessel to port may give much improved outcomes.

    If you still can't spot the issue then please submit a Service Request with your files for me to take a look at.

    Regards,

    James

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