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msonnathi1-Visitor
1-Visitor
October 2, 2014
Question

how to make curve with equation

  • October 2, 2014
  • 4 replies
  • 11653 views

Hi Team,

I would like to make axial fan flow curve using equation. application is air conditions inlet fan airflow design.

please help out make curve with equation, equation should be dependent on radius. If I change radius the curve should be updated as per that.

thanks,

Madhu

    4 replies

    R
    RichardJ19-Tanzanite
    19-Tanzanite
    October 2, 2014

    Please post a worksheet with the equation.

    M
    msonnathi1-VisitorAuthor
    1-Visitor
    October 3, 2014

    here is my question how, where to start. I donot know anything about creating curve with equation.

    could you please tell me the procedure from start to end.

    W
    Werner_E25-Diamond I
    25-Diamond I
    October 3, 2014

    Madhu Sonnathi wrote:

    here is my question how, where to start.

    Where?

    Chose "Use advanced editor" at the upper right and then you get the option at the end of your post to attach a worksheet.

    Another question, as I see that so far you had only posted in the Creo section: Are you sure you have a problem with the program Mathcad?

    F
    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    October 6, 2014

    This is a very complex subject.

    Attached is a very simplistic development of a generic curve. And a discussion of the subject.

    T
    tdevaraj1-Visitor
    1-Visitor
    October 9, 2014

    Not sure if this exactly what you are looking for.

    You can see some great examples done by Dr J Alan Adams

    http://www.usna.edu/Users/mecheng/adams/indexf.html

    Links to the lectures will then allow you download the Mathcad worksheets.

    Note the worksheets are all in Mathcad 2001i, if you want to use them in Mathcad Prime you will need to convert them.

    content.jpg

    blade-mc.jpg

    I took the worksheet a step further.

    We can take the 2D profiles of the blade calculated (I modified Alan's worksheets on Axial flow machines)

    Generate the XYZ coordinates and use the curves at specified intervals along the blade to recreate the solid part in CAD. (Creo parametric in this case)

    creo part.jpgfull part.jpg

    In this example the centre-tip and centre-hub radii are varibles in Mathcad. (they can be associated with parameters in CREO)

    Thomas

      V
      24-Ruby III
      VladimirN24-Ruby III
      24-Ruby III
      October 10, 2014

      Thomas,

      Thank you for providing this information.

      B
      bellia1-Visitor
      1-Visitor
      March 28, 2020

      The equation of the line is y=−14x+1, and the curve looks like a sine curve y=sin(2πx4) (where x is scaled so that it makes a cycle from 0 to 4) added to that line. Therefore, y=−14x+1+Asin(2πx4) but the amplitude A is tricky from the figure, so perhaps choose A=0.15.

       

       

       

       

       

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