AVL Tutorial (2) - Model your Airplane

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  • Опубликовано: 28 июл 2024
  • This AVL Tutorial - Part 2 - will teach you how to model your own airplane geometry in a simple text editor for calculation in the Athena Vortex Lattice Code, which is very useful for quick and reliable Aerodynamic Analysis, Trim Calculation, Dynamic Stability Calculation.
    I used it extensively in my Bachelor Thesis and further works on the battery-electric touring motorglider FVA 30 (www.fva.rwth-aachen.de/), as a research assistant at the Flight Systems Dynamics Institute of RWTH university (www.fsd.rwth-aachen.de/) and for personal UAV and model aircraft design.
    AVL was written by Mark Drela and Harold Youngren (Massachusetts Institute of Technology).
    "AVL is a program for the aerodynamic and flight-dynamic analysis of rigid aircraft
    of arbitrary configuration. It employs an extended vortex lattice model for
    the lifting surfaces, together with a slender-body model for fuselages and nacelles.
    General nonlinear flight states can be specified. The flight dynamic analysis
    combines a full linearization of the aerodynamic model about any flight state,
    together with specified mass properties."
    More information on web.mit.edu/drela/Public/web/avl/

Комментарии • 29

  • @kurtcobainsr
    @kurtcobainsr 4 года назад +2

    Great video! Very useful!

  • @fabioli96
    @fabioli96 4 года назад

    Very useful, thanks!

  • @joshuamadero4508
    @joshuamadero4508 4 года назад +1

    Much appreciated!

  • @nawfhou9223
    @nawfhou9223 Год назад +1

    Great Video series @Benjamin Kelp

  • @maurocanto9845
    @maurocanto9845 4 года назад +2

    Useful video, thank you, could you upload part 3? I'm having trouble when running. Regaardsss!!!

    • @BenjaminKelm
      @BenjaminKelm  4 года назад

      Hey Mauro, thanks for the feedback. Part 3 is upcoming.

  • @mustafamert7008
    @mustafamert7008 8 месяцев назад

    Hello , how can i make my control surface to be replaced by angle.

  • @tifosaurus
    @tifosaurus 3 года назад

    Hello! Thanks for the video. In the Control declaration, pls explain usage of XYZhvec.

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      It gives you the hinge vector. However, in my experience it doesn’t really matter - seems AVL hasn’t implemented this for the standard use case.

    • @tifosaurus
      @tifosaurus Год назад

      @@BenjaminKelm Thanks for your answer. However, it does matter as a declaration. If you put another declaration instead of 0.0.0., you obtain different stability derivatives. I have checked it. I don' t know what the usage in declaring a hinge vector different than that of the real hinge line would be, however. That's why and as per common practice, I always declare the vector along the hinge line (0.0.0.) and thus obtain the stab. Derivatives as they should be.

  • @albelnoxroxursox
    @albelnoxroxursox Год назад +1

    Hi, these were great videos. I have a problem - when I open the geometry window, keystroke mode does not work even though I have the cursor in the window when I hit LRUD. The picture does not rotate at all. I don't know what to do; it seems to work perfectly fine for those doing the tutorials on RUclips. Do you have any idea what might be causing this issue?

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Sorry, no idea. Have you "clicked" and activated that geometry window?

  • @dleojl
    @dleojl 10 месяцев назад

    Hello, may I know if it is possible to model a V-tail in AVL? and if so how would you go about doing it? Thank you

  • @nehisinha1816
    @nehisinha1816 2 года назад +1

    Can you please explain what non unity Gain values physically represent for control surfaces like elevons? And how do you find these values for a model?

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Gains are just simple multipliers to the control surface input. Mainly interesting for mixing different control surfaces. Hope that helps

  • @nitheshkumar9886
    @nitheshkumar9886 2 года назад +1

    hello sir, have a question regarding the drooped wing. if the wing is divided into n sections for instance n=10, from n=8, have to droop the wing. so how to do that in AVL, sir?

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Consult the manual - it's possible to set an incidence angle for each section.

  • @goldenfang57
    @goldenfang57 3 года назад

    When changing the values in the Supergee.avl file, can we work in any unit system of our choosing?

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Yes, the units are typically defined in the .mass file

  • @andreaparmegiani4067
    @andreaparmegiani4067 5 месяцев назад

    Hi, i was wondering if AVL can take as an import an .stl or some form of CAD file generated in a CAD software (i.e. Rhinoceros) or if the only way to import a geometry is through the avl geometry file.

  • @faisal1934
    @faisal1934 3 года назад +3

    I am having a weird problem that I cant really fix. whenever i tried to load the file that i created for my designed plane, AVL just shuts down. if anybody knows what exactly is the problem please answer this comment

    • @krystofbednar7534
      @krystofbednar7534 3 года назад +1

      Hello, I've just started to use AVL but it seems to me that you are running AVL directly and not from CMD. Try to run it from CMD. AVL might still crash but CMD will stay open and will show you the errors. The same thing as you describe was happening to me. I've changed the values of Nchord, Cspace Nspan Sspace (distribution of vortices) through trial and error.
      values which worked for me 7 1.0 30 0.0 ! Nchord Cspace Nspan Sspace

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Sometimes this can happen (under windows) if the file was not set up properly (like having TABS in there).
      Also these top declaration might cause problems (Under Windows) if they are not defined as floats (0.0 not 0)
      Example .avl file:
      Bubble Dancer RES
      0.0 Mach
      0 0 0.0 iYsym iZsym Zsym # 0 instead of 0.0 might cause an issue in Windows.
      1000.0 10.0 116.6 Sref Cref Bref
      Just try to keep an eye out for that.

  • @alpergozen5231
    @alpergozen5231 3 года назад

    How can I calculate incidence angle from the sketch of wing?

    • @BenjaminKelm
      @BenjaminKelm  Год назад

      Just see what angle the skeleton line of the profile has compared to the x-axis of your plane. That might not be well defined - that's why we talk often about "incidence angle difference" between wing and tail surfaces.

  • @valeriasainez957
    @valeriasainez957 4 года назад

    How to make cp 30 degrees from 25% of the root chord???