NLPARM

Karthic_22061
Karthic_22061 Altair Community Member
edited October 2020 in Community Q&A

Hi,

I am trying a nonlinear DTRAN load case in OptiStruct

Can you please share an example/Tutorial that effectively uses all the NLPARM parameters ?

 

I am confused with the NLPARM parameters and also with the NLOUT parameters , really finding hard to control the animation output time step.

 

Please do share me if any links / tutorials

Tagged:

Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited November 2020

    Hi Karthik,

     

    Here is a example file

    Unable to find an attachment - read this blog

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

     

     

     

    Thank you Prakash,

     

    I ran the file you sent, in which

    How do i get the animation results at required time frame . Say i need the results at 0.4 Sec ?  

    From  animation i got the results for 0.324 and .421 sec

     

    <?xml version="1.0" encoding="UTF-8"?>Animation time step.png

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    <?xml version="1.0" encoding="UTF-8"?>Animation time step.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    Karthik,

     

    You need to try changing the NINT (number of intervals, trial and error). Right now there is no option to output results at a particular time step.

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Prakash,

    what about the NLPARMX option in NLPARM. Is it only for Static Analysis ?

    can  DTA(Output time step for animation files) help?

    I am trying out NLPARMX, but no impact on animation results

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    NLPARMX is for NLGEOM implicit. Are you using NLGEOM analysis type?

     

     

    Instead you can try DT and TTERM on NLPARM. Check if this gives any good results. 

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Thank you Prakash

     

    I am doing nonlinear Direct Transient

     

    Is it possible to continue the run in subcase2 ? including the effect of case 1

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    karthik,

     

    Yes, please use CNTNLSUB

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Prakash,

    Thankyou for the help, i found the CATNLSUB in control card. How can i call it in the second sub case?

     

    <?xml version="1.0" encoding="UTF-8"?>cntnlsub.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    Karthik,

     

    To avoid confusion, you can create CNTNLSUB within subcase.

     

    Edit the 2nd subcase and find the CNTNLSUB and refer the fist subcase in the same. 

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    sorry for simple question, I coudnt find CNTNLSUB within subcase and how to link

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    Karthik,

     

    It should be available in Nonlinear with DTRANS subcase. Click edit and should be able to see it.DTRANCNTNLSUB.PNG

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    HI,

    i don't find it . is it available only with 2017 version?

    <?xml version="1.0" encoding="UTF-8"?>cntnlsub.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited September 2017

    Hi karthik,

     

    Looks like you are using Direct transient analysis type and not Nonlinear Direct transient analysis. This is added in 2017.

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Prakash,

    I am using Nonlinear Direct transient analysis only. But i don't find CNTNLSUB

    <?xml version="1.0" encoding="UTF-8"?>cntnlsub.png

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited September 2017

    This is available with latest Hyperworks desktop 2017.2. PFA screenshot of release notes.

    <?xml version="1.0" encoding="UTF-8"?>Hyperworks desktop 2017.2.JPG

  • Karthic_22061
    Karthic_22061 Altair Community Member
    edited September 2017

    Hi Rahul Rajan and Prakash,

    Thank you for the support

Categories