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Posts posted by priyankabhola

  1. On 3/30/2020 at 3:16 PM, Nathan said:



    As Farouk said, V1 and V2 are respectively the lower and upper frequency bound.

    For example, if you write V1=20 and V2=2000, then it will search for Natural Modes frequency only in this range [20,2000] (according to your unit system, generally Hz).

    ND is to specify the number of roots (so of modal frequencies) you want.


    Please find the table attached from EIGRL OptiStruct help. If you combine V2 and ND, it will only compute the minimum number of frequencies allowed by either V2 or ND. 





    thanks  a lot

  2. On 3/28/2020 at 8:53 PM, Farouk Maaboudallah said:



    First, you are running Real Eigenvalues Analysis using Lanczos solver (EIGRL).


    V1 and V2 mean the lower and upper bound of your frequency domain.


    ND means the number of roots (number of eigenvalues) of the following equation :

    (-w^2*M - K)*phi = 0


    with w refers to the real eigenvalue and phi means the eigenvectors.



    thanks a lot for reply 

  3. Hi,


    i want to regarding model analysis card deatil EIGRL card .

     what is meaning of V1, V2 ,ND.... when should i use  v1 and v2 .difference between v1 and v2. i saw some tutroial online someone use v1 some one use v2.  can you explain in detail.


    Thanks in advance

    Priyanka bhola

  4. Hello,

    Thanks for your reply,


    actually reason for using linear static is time save i just want to check the total stress on floor for optimization first .  

    if it will behave ok and after that i want to go for non linear.


    can you guide me or help for non linear for the same project.

     boundary condition or deck setup.


    or share some tutorial.


    with regards


  5. Hi,


    i am doing analysisin optistruct 

    project detail as per following.


    load body (load caring vehicles).

    payload  37ton apx.

    traget: i want to test strength for floor members . not only floor even all side walls of vehicles. can sastain the load.


    problem: master --dummy weight in 3d mesh 37 ton. 2.) slave: load body mesh part. but master weight run out of load body .connect not work properly betwen body and dummny weight.weight goes out of side walls .please help.  i dont want to apply pressure or force because at a time it work either on floor or side wall of load body. i want dummy weight will work at a time all sides (floor side and front and rear wall)

    file attached for ref.


    With regards




  6. hi this is priyanka

    please help me in rollover bus. i have done bus rollover project as per std in Ls dyna through Angular velocity .  what i did i calculate angular velocity. and unstable angle. for time saving purpose i rotate the bus near to floor (gap 2-3mm)from rigid floor . and then run in ls dyna .


    i never did free fall run (means tilt the bus from unstable angle through gravity value.) i face problem in free fall run .(want to co relate results with physical testing). my bus not rotate againt angle . its jump up and down not tile can u please help which contact i should us for rotation of bus. or either i share my result or deck file.please help.


    video result file attached to understand the error . please see and support

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