GZ curve

Discussion in 'Software' started by mallia.s, Apr 16, 2010.

  1. mallia.s
    Joined: Sep 2009
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    mallia.s Junior Member

    Hi,

    I have modelled a hull in Maxsurf Demo version, and would require to extract its GZ curve. Unfortunately in the Demo, or the academic version, this is not a feasible option.

    Is there a FREE software that I can develop the GZ curve after being imported from Maxsurf?


    Thanks

    Steve
     
  2. marshmat
    Joined: Apr 2005
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    marshmat Senior Member

    I suppose you could try ArchimedesMB ( http://naval-architecture.co.uk/ ). As with all computerized analysis, the GIGO rule applies (garbage in, garbage out) - the analysis won't mean much until you take the time to go through the program and figure out exactly what each parameter and option means.
     
  3. mallia.s
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    mallia.s Junior Member

    Hi,

    Thanks for your help. But how can I import the model I have already drawn from Maxsurf? Is there a particular format?


    Thanks


    Steve
     
  4. marshmat
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    marshmat Senior Member

    ArchimedesMB can read GHS files, which I believe Maxsurf is capable of generating.
     
  5. mallia.s
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    mallia.s Junior Member

    Hi,

    Apparently, Maxsurf only reads (imports) a file of GHS format.


    Thanks

    Steve
     
  6. zeroname
    Joined: Oct 2008
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    zeroname Naval Architect

    If u did it in Maxsurf academic ,,, save it as 3d IGES or rhino 3dm ..
    now open it in rhino and Save it as GHS format to load in Archimedes..
    i assume u have rhino.
     
  7. mallia.s
    Joined: Sep 2009
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    mallia.s Junior Member

    Hi all,

    I did all you said, and I did import it in Archimedes. But I only managed to extract the KN curves not the GZ curve... What am I doing wrong?


    thanks


    steve
     

  8. Martijn_vE
    Joined: Apr 2005
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    Martijn_vE Marine software developer

    You are practically there.
    The Kn curves are the stability curves for a VCG height of zero.
    For each heeling angle phi subtract VCG*sin(phi) to obtain your righting lever GZ, so GZ=KN-VCG*sin(phi)
     
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