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Mr. PRABU DUPLEX

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Posts posted by Mr. PRABU DUPLEX

  1. Posted · Report reply

    Dear Matthias,

     

    If I need to do the same first I need to design the blade with all these parameters (blade functions chord, skew, pitch, maximum thickness) and edit the code for the necessary results (total resistance, thrust deduction)?

     

    Regards,

    Prabu

  3. Posted · Report reply

    Thanks Claus !

     

    I am so used to other programs that FF has been a real challenge ! i end up forgetting the basics.

     

    I having a lot of trouble to import this RORO ship to framework. i am using section sweep also but i find it hard to close the bow and the Stern parts.

     

    any tuturial or User guide on importing hulls please send me a link

     

    thanks again!

    Hi Carlos,

    can you please explain how did you rectify this problem? I'm also facing the same.

     

    Regards,

    Prabu.

  4. Posted · Report reply

    Dear Mattia,


     


    I imported the IGES file created in NAPA after that I created the lofted surface according to your instructions. After this step my surface is not even like the one I find in your file. Please find my attached file.


     


    Afterwards if I want to modify the bulbow bow and the hull can I use transformation functions after this step for the changes?


     


    Regards,


    D.Prabu.


    post-223-0-96755600-1409145702_thumb.png

  5. Posted · Report reply

    Dear Stefan,

     

    as you already noted in the last post, what you are actually trying to do is combine all your surface patches into a single surface. The right object type for this is the polysurface. The surface group is merely a container for several surfaces and can e.g. be used to easily apply the same transformation to several surfaces or generate a section group.

     

    Unfortunately, it is quite tedious to combine such a large number of surfaces into a polysurface. The orientation of the surfaces has to be consistent. Additionally, you need well ordered rows and columns of surfaces. It would require multiple steps for this case and I wouldn't recommend it. My suggested procedure is to create sections with the surface group and loft/skin them with a new surface. See what I did in the attached project file. I used a feature for the lofting which is also supplied with the Framework. However, I have revised it and will exchange the supplied feature for the next Framework version.

     

    For slightly better results you can also do separate surfaces e.g. treat flat of bottom and flat of side separately. See approach2 in the project file.

     

    Hope this helps. Cheers,

    Mattia

    Dear Mattia,

     

    I imported the IGES file created in NAPA after that I created the lofted surface according to your instructions as follows"My suggested procedure is to create sections with the surface group and loft/skin them with a new surface". After this step my surface is not even like the one I find in your file. 

     

    Afterwards if I want to modify the bulbow bow and the hull can I use transformation functions after this step for the changes?

     

    Regards,

    D.Prabu.

  6. Posted · Report reply

    Hi Daehwan,

     

    Thank you for the reply. After importing can I proceed only by using lackenby shift(forepart) and delta shift (bulbous bow) functions to do it in a partially parametric way(my time duration is limited for the project). Also if you can explain more about using delta shift function it will be helpful for me.

     

    Regards,

    D.Prabu.

  7. Posted · Report reply

    Hi Daehwan,

     

    For my master thesis I found this concept will be useful since I have to optimise the EEDI value of ship.

     

    Can you please elaborate more about this variation process?

     

    Do I need to specify some delta shift function before using this?

     

    Also can I apply this and do my calculations with out doing any modifications in the forepart?

     

    Also if I have designed already a hull with bulbous bow in NAPA how can can I modify it(bulbous bow only) with parametrisation in Cases? If I can do so can I do with out modifying the fore part?

     

    Regards,

    D.Prabu

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