Stability calcs from Rhino model

Discussion in 'Software' started by tallen, Sep 18, 2007.

  1. tallen
    Joined: Jul 2007
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    tallen Junior Member

    I have a hull I made in Rhino and I want to do some damage stability calculations on the hull. What is the best way to go about doing this? Is there any plugins for rhino, other good software that is friendly with rhino hulls. Is any of this software low cost / free?
     
  2. CGN
    Joined: Jan 2003
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    CGN Senior Member

    For Damage stability the "low cost" ones that i have seen are Hyss.xls and the stability module from NewWavesys (Prosurf line of software) Prosurf is around 2000US and Hyss.xls is 750 euros.

    Prosurf stability module can read GHS (??), and Hyss is a little bit more work becouse you need to input the curves that defines your model, but it does the job.
     
  3. tallen
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    tallen Junior Member

    How about AutoHydro, or any others that would have a student discount?
     
  4. yago
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    yago __

    If you only need it for one boat, you could use the time limited trial version of Rhinomarine, download at www.rhinomarine3d.com
     
  5. tallen
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    tallen Junior Member

    I thought Rhino Marine only does intact stability and not Damage stability
     
  6. ABoatGuy
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    ABoatGuy Member

    Tallen,

    Rhino can write a GF file which can be read by AutoHydro or GHS, both are full stability packages.
     
  7. tallen
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    tallen Junior Member

    I was wondering what is the best way to do this calculation by hand if no software is accessible to me. Most methods i have seen rely on using a tangent waterline to the margin line... the problem i have is that my bulkhead deck is parrallel to the waterline and it is flat. So can anyone please help! Need this help urgent.
     
  8. ABoatGuy
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    ABoatGuy Member

    Stability calculations by hand are extremely tedious. You don't want to go there if you can avoid it. That said if you can find a copy of Skenes Elements of Yacht Design, there are fairly detailed instructions in the back. The book is out of print, but libraries often have copies or try Amazon used books.

    Phil
     
  9. Martijn_vE
    Joined: Apr 2005
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    Martijn_vE Marine software developer

    It's back in print, bought one recently.
     
  10. yachtboy
    Joined: Feb 2007
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    yachtboy Junior Member

    Elements Yacht Desing

    hi,

    Elements of Yacht desing has re print done 2001, so new ones available.

    If you need no cost package just for stability you might find
    DelftShip usefull. It dose most of work.

    But STIX kind of criteria need's something more, I have been working
    out own pure calculation system and at near future it's capeable to
    calculate 360deg,....

    Anyway look at http://www.delftship.net/, just wondering why did not
    starting whit hull desing at delftship. Perhaps next time.


    joni
    http://desing.myjohn.info

    ps. if anyone intrested to network, to get projects, to get projects done,
    needs company,... welcome to desing.myjohn.info

     
  11. terhohalme
    Joined: Jun 2003
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    terhohalme BEng Boat Technology

    Leak stability in RhinoMarine

    I put this first to a wrong thread:

    Could this be a suitable solution?

    First, calculate hydrostatics with a sound hull and pick up displacement and LCB.

    Then cut off the leaking compartment of the model and calculate hydrostatics/CG (use previous LCB and displacement). The model trims and heels nicely.
     

    Attached Files:


  12. Magno
    Joined: Oct 2007
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    Magno New Member

    Cutting a part of the model is valid and is used by some programs for Damaged Stability. But you must also put in mind that, if there is equipment or structural elements inside the compartment that was flooded, the water will not take the place of them. If you do not need more realistic results I think it can be done.

    Another thing you can do is put a weight representing the water that entered in the compartment and adjust the water density to consider the presence of solid elements (machinery or structural elements) in the flooded tank.
     
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