ARQN , new software : naval architecture calculations for everyone .

Discussion in 'Software' started by TANSL, Apr 25, 2014.

  1. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    Leo, if you find it interesting, I would be happy to make a subroutine to obtain the results in the format that users of your programs need. I do not take much effort and it would be a way to expand the potential users of my application.
     
  2. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    The offset table format is described in the Michlet manual.
    The same format is used in Flotilla, except it is best to have some
    waterlines above the static waterline to allow for squat and the hull
    wave profile.

    I am currently working on the next version of Flotilla. When I have
    finished that we should see how we can get the programs to work
    together. I think it will be quite easy!

    First let's see if Spain can win their first game. You might have tears in your
    eyes and won't be able to focus on your code :p
     
  3. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    First, what is really important: I hope España wins. I'm not very interested in soccer, but "could be dangerous" not to wish the victory of our team.
    And now, the secondary: seems very interesting to prepare a module linking your programs with mine. I think I'm going to make a module that allows to work with the body lines plan and get the data into a format that can be read directly by your software. Just tell me the name must be the result file, extension and format, that is, how do you want to read it.
    The other modules in my program for calculating hydrostatic, load conditions, intact stability and after damage, etc.. in this case not needed.
    I have to study more thoroughly your software. Should I have have any questions, I will consult.

    Cheers
    Ignacio
     
  4. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    I'm only interested every 4 years. I have relatives from Germany, Russia,
    Argentina, and my sister is in Spain at present, so I can support many
    teams. In fact, anybody, as long as they beat England and USA. :)
    I guess España is in mourning today!

    Here is an offset file for a Wigley hull used by Flotilla. It is a simple text file.
    The default filename is offsets.flo
    The default input type is 0; the sub_type is also 0.
    Comments have '#' as the first character.

    ######################################################################
    # offsets.flo
    ######################################################################
    # offset_input_type
    0
    # offset_input_subtype
    0
    # number of stations (odd)
    9
    # number of waterlines (odd)
    5
    # Offset Table
    0.000000, 0.000000, 0.000000, 0.000000, 0.000000
    0.000000, 0.029170, 0.050006, 0.062508, 0.066675
    0.000000, 0.050006, 0.085725, 0.107156, 0.114300
    0.000000, 0.062508, 0.107156, 0.133945, 0.142875
    0.000000, 0.066675, 0.114300, 0.142875, 0.152400
    0.000000, 0.062508, 0.107156, 0.133945, 0.142875
    0.000000, 0.050006, 0.085725, 0.107156, 0.114300
    0.000000, 0.029170, 0.050006, 0.062508, 0.066675
    0.000000, 0.000000, 0.000000, 0.000000, 0.000000
     
  5. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    What if the low point of a frame does not match with a water line? . What units are given the offsets?
    I suppose I would have to give the value of the frame spacing as well as water line spacing.
     
  6. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    It doesn't matter, as long as there are enough waterlines. My method uses integrations, so as long as there are enough waterlines, the errors are very small.

    The units of the offsets are irrelevant. They are scaled by the overall beam in my program.
     
  7. TANSL
    Joined: Sep 2011
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    Location: Spain

    TANSL Senior Member

    Okay, mistakes can be very small (or not) but why not avoid the mistakes?.
    When you say that breath value is, lets say, 0.06234, what does it mean?, is it the overall beam multiplied by 0.06234?. The overall beam is the maximum breadth of waterline, or the maximum breadth of the ship?. How is this overall breadth set in a multihull?
    How the frame spacing is indicated?
    How the water line spacing is indicated?
    Cheers,
    Ignacio
     
  8. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    Because it makes very little difference to resistance, squat or wave
    elevation predictions. If users require very accurate surface areas
    or volumes, they already have those in your program.

    Yes. It is the beam of the hull, not the overall breadth of a multihull.
    The overall beam of the widest waterline in the offset table.
    The highest waterline is not necessarily at the deck. It just has to
    be a bit higher than the static waterline to accommodate the hull
    wave.

    In the example table I gave earlier, those offsets can be scaled to
    any size, i.e. length, breadth, and depth.

    The user supplies the overall length and the number of frames in the
    offset table.
    They also supply the height of the top waterline above the baseline, and
    the draft of the vessel.
    For catamarans (in Flotilla) the user specifies the distance between
    hull centreplanes.
    In Michlet, the user specifies the location of each (up to 5) demihull.
     

  9. TANSL
    Joined: Sep 2011
    Posts: 6,947
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    Location: Spain

    TANSL Senior Member

    Thanks, Leo, I think everything is clear now.
    I begin now to adapt my program to yours.
     
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