TCL TO GET MIDLINE

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi everyone, i would like to know if there is any tcl that extracts the midline of all displayed thickened pipes comps. If not, is there way we can create a tcl to extract midline for all the displayed hollow thickened pipes..

 

Thank you in advance

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Answers

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited November 2017

    'Midline' or 'midsurface'?

    A sample of HM model?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2017

    hi nyuyen , i mean midline of a solid cylinder with some diameter (lets say 100mm). Pls Imagine there are some, 50 cylinders of such kind or say wires ( unattached to each other) and i want to extract midline for all of them at once using a tcl..... unfortunately i dont have the model so couldnt attach.. i am however attaching an image for ur understanding

     

    thanks in advance 

    <?xml version="1.0" encoding="UTF-8"?>download.jpg

  • HenLopes
    HenLopes Altair Community Member
    edited July 2019

    Hello everyone, I'm retriving this topic again in order to see if someone could help me.

     

    I have a 3D model (tubular structure) I want to mesh with 1D CBAR elements.

     

    Anyone please know a quick way to get the midline of the 3D model tubes?

     

    Thanks in advance.

     

  • tinh
    tinh Altair Community Member
    edited July 2019

    Panel geom>lines>mid lines

    Does it help?

  • HenLopes
    HenLopes Altair Community Member
    edited July 2019

    Hi tinh,

    Thank you for your attention to this matter.

    I'm not really seeing your point.

    I have a strucutre like this and i need to extract all midlines (in blue) in between.

    Could you please be more clear?

    Thanks

     

     

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited July 2019
    • Node => Arc center
    • Build curves from above nodes

    Got 'midline' of tubes :P/emoticons/default_tongue.png' srcset='/emoticons/tongue@2x.png 2x' title=':P' width='20' />

  • HenLopes
    HenLopes Altair Community Member
    edited July 2019

    Ok I got it, thank you so much Q.Nguyen-Dai and tinh.

     

    But know I have another question, because I have a big structure I do not want to do all the process by hand ( that would be very time consuming)

     

    Is there a TCL scripting code to that automatically? I mean just selection all teh tubular structure at once and give me all the midlines?

     

    Thank you for your kind support.

     

     

     

  • tinh
    tinh Altair Community Member
    edited July 2019

    A such script is not yet found.

    If you find it or write it, pls share us.

    I think it is rarely used so nobody write.

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited July 2019

    Yes, if it takes 4h to write this script and you use only one time, it's NOT worth writing.

  • avadutala
    avadutala Altair Community Member
    edited October 2019

    I still dont get how you create midlines from a curved solid tube. 

  • avadutala
    avadutala Altair Community Member
    edited October 2019

    Attached the sample picture of geometry.  I want to write a code to extract the midline of the tube and calculate thickness. greatly appreciate of anyone can help me

    <?xml version="1.0" encoding="UTF-8"?>image1.jpg

  • Q.Nguyen-Dai
    Q.Nguyen-Dai Altair Community Member
    edited October 2019

    Maybe you can do it (midline) with some CAD softwares.

  • avadutala
    avadutala Altair Community Member
    edited October 2019

    Ya. I know CAD software can do it on fly. but I need to extract in Hypermesh.  Its the first step in my analysis and I always gets CAD without midlines. 

  • avadutala
    avadutala Altair Community Member
    edited October 2019

    I tried writing TCL code for this by sequentially selecting outer parallel lines and finding midlines and joining all of them. But I need more robust code

  • tinh
    tinh Altair Community Member
    edited October 2019
    Altair Forum User said:

    I tried writing TCL code for this by sequentially selecting outer parallel lines and finding midlines and joining all of them. But I need more robust code

    That's problem if the 2 lines are not slice the sequence in 2 equal parts.

     

    To specify mid line, i suggest you to extract parametric uv lines of each outer surface. In simple case you will get u or v as arcs, find arc centers and connect them you will get mid lines

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