Create MPC for 3D element

Alex Nguyen
Alex Nguyen Altair Community Member
edited June 13 in Community Q&A

Hi everyone, Now I have a problem deal with create MPC for 3D element.

My components include 2 parts fix together (bolt and plate). At thread match position, I want to create MPC connection between thread and hole

But it apprears error ' DOF on grid 704 appears twice in equation, please modify dof selections'. Whether I made MPC connection rightly or not?

Thanks guys

 

 

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Answers

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

    What's your final goal of using MPC?

  • tinh
    tinh Altair Community Member
    edited May 2019

    He is doing homework about mpc, i think so!

     

    Alex, Could you take photo of mpc definition? Dofs & nodes?

  • Alex Nguyen
    Alex Nguyen Altair Community Member
    edited May 2019

    Dear Mr. Tinh and Mr. Q.Nguyen Dai

    I have a assembly structure between bolt and hole. My mission has to connect them together by match node and MPC node. (green line in below figure)

    Weight factor of Dependent node= -1 and Weight factor of Independent = +1 for each DOF

    But after I create mesh bolt and hole (ensure match node), then I create MPC, and MPC warn that ' DOF on grid 704 appears twice in equation, please modify dof selections'. 

    I also wonder why need create MPC while these nodes ( between bolt and hole) were matched together (coincident node). Or maybe because these nodes were matched together so MPC can not created?

    Thank so much Mr. Tinh and Mr. Q.Nguyen Dai 

    :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

     

  • tinh
    tinh Altair Community Member
    edited May 2019

    Yeah, i understand.

    2 nodes are concident => so you cannot pick them separatedly.

    You pick n704 as dependent, and then pick overlapped one as independent but hypermesh catches n704 so n704 was selected for both dep and indep=>

    Press O to enter panel Options>graphics> activate 'concident picking' and try again.

     

    Are you sure there are 2 nodes ? In case you equivalenced them (shift F3), you have to detach (panel 3d>detach)

     

    If you shared nodes (equivalenced), you don't need mpc because there's only 1 node.

     

    You did not answer question of @Q.Nguyen-Dai ?  I want to know your goal, too.

  • Alex Nguyen
    Alex Nguyen Altair Community Member
    edited May 2019

    Thank you Mr.Tinh

    Yeah, I understood. 

    I'm very sorry for forget answer question of @Q.Nguyen-Dai. My goal of using MPC is calculate Nonlinear Static Structure( stress, displacement, deformation). Really I also only know that much.

    I'm be grateful Mr.Tinh so much. I remember this is third time you support me about MPC problem:D/emoticons/default_biggrin.png' srcset='/emoticons/biggrin@2x.png 2x' title=':D' width='20' />. Thank you so much

    Best regard @tinh and @Q.Nguyen-Dai

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited May 2019
    Altair Forum User said:

    Dear Mr. Tinh and Mr. Q.Nguyen Dai

    I have a assembly structure between bolt and hole. My mission has to connect them together by match node and MPC node. (green line in below figure)

    Weight factor of Dependent node= -1 and Weight factor of Independent = +1 for each DOF

    But after I create mesh bolt and hole (ensure match node), then I create MPC, and MPC warn that ' DOF on grid 704 appears twice in equation, please modify dof selections'. 

    I also wonder why need create MPC while these nodes ( between bolt and hole) were matched together (coincident node). Or maybe because these nodes were matched together so MPC can not created?

    Thank so much Mr. Tinh and Mr. Q.Nguyen Dai 

    :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

    1.JPG

    Hey. I'm experiencing the same problem. I was trying to resolve it somehow, but I wasn't lucky.

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited July 2019
    Altair Forum User said:

    Dear Mr. Tinh and Mr. Q.Nguyen Dai

    I have a assembly structure between bolt and hole. My mission has to connect them together by match node and MPC node. (green line in below figure)

    Weight factor of Dependent node= -1 and Weight factor of Independent = +1 for each DOF

    But after I create mesh bolt and hole (ensure match node), then I create MPC, and MPC warn that ' DOF on grid 704 appears twice in equation, please modify dof selections'. 

    I also wonder why need create MPC while these nodes ( between bolt and hole) were matched together (coincident node). Or maybe because these nodes were matched together so MPC can not created?

    Thank so much Mr. Tinh and Mr. Q.Nguyen Dai 

    :)/emoticons/default_smile.png' srcset='/emoticons/smile@2x.png 2x' title=':)' width='20' />

    <?xml version="1.0" encoding="UTF-8"?>1.JPG

    oh... I have the same problem. really. I don't know what to do 

  • Alex Nguyen
    Alex Nguyen Altair Community Member
    edited July 2019

    HI @matthampton and @DawnPeterson

    As above tutorials, You should not equivalence 'couple nodes'. Make ensure that One node in number ID is 'a', and another node which number ID is 'b' .

    You let try. I had finish it.

    Thank you everyone

    Best Regards

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited October 2019

    If you are looking for the essay writing service and Aerospace Engineering Assignment Help then you should definitely go for AllAssignmentHelp.com. We offer all types of subjects assignment helps at the best price.
     

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