larger displacement of an element during analysis

RAMGANESH
RAMGANESH Altair Community Member
edited October 2020 in Community Q&A

Dear Sir,

 

I have done impact analysis on my Rollcage model but the results shows that larger displacement for a particular element as shown in the figure below

 

i had checked for the element quality like warpage,aspect ratio,jacobian all are fine.then what it will be the error?

 

Kindly Provide your guidelines

 

Thanks & Regards

Ramganesh

<?xml version="1.0" encoding="UTF-8"?>post-34029-0-46783200-1416823088_thumb.p

<?xml version="1.0" encoding="UTF-8"?>post-34029-0-39460900-1416823095_thumb.p

<?xml version="1.0" encoding="UTF-8"?>post-34029-0-60270100-1416823102_thumb.p

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2014

    Hi RamGanesh,

     

    Please check whether the unit system is consistent or not, in your model. this could be one of the reason.

     

    next, is check if there are any free nodes. Go to Tool>> Edges>> Prvw Equivalence. if you find any free nodes, please equivalence in the same panel.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited November 2014

    Dear Sir,

     

    i dont understand this statement 'check whether the unit system is consistent or not, in your model''

     

    In my model the units are in KG,N,MM & S and there is also no free nodes or edges in my model

     

    kindly explain

     

    Thanks

    Ramganesh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2014

    Hi Ram,

     

    Can you share the model, please?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2014

    Hello,

     

    your units are not consistent !! You have to use t, N,mm and s. But maybe it's not the solution for your problem.

     

    Regards,

    Mario

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2014

    I think there's problem with his mesh. Please check elements (quality, connectivity,...) and free node.

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited November 2014

    Dear Prakash Sir,

     

    I have checked the model for free edges and corrected the model .now i got the results but still there is some problem in modal analysis

     

    Thanks

    Ramganesh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2014

    Hi RamGanesh,

     

    I did not see any huge displacement as seen in the pictures you shared.

     

    Please see the attached image which shows displacement results for the same load case which you referred to: 

    <?xml version="1.0" encoding="UTF-8"?>post-7616-0-24565400-1417413027_thumb.jp

  • RAMGANESH
    RAMGANESH Altair Community Member
    edited December 2014

    Dear Sir,

     

    I have got the displacement results correctly after correcting the free edges,but still i have problem in modal analysis of that modal which i had send?

     

    Kindly provide guidelines 

     

    Thanks & Regards

    Ramganesh

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited December 2014

    Hi RamGanesh,

     

    So what is the issue?

     

    I think you have given a frequency range of interest and you get the same in your results.

     

    instead, give number of modes of interest (remove V1 and V2 and give only ND) in EIGRL card.

Categories