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NLPARM

Karthic_22061

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

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Altair Forum User

Hi Karthik,

Here is a example file

Unable to find an attachment - read this blog

Karthic_22061

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"?>

Karthic_22061

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

Altair Forum User

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

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

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

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

karthik,

Yes, please use CNTNLSUB

Karthic_22061

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"?>

Altair Forum User

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

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

Altair Forum User

Karthik,

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

Karthic_22061

HI,

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

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

Altair Forum User

Hi karthik,

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

Karthic_22061

Hi Prakash,

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

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

Rahul Rajan_21763

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

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

Karthic_22061

Hi Rahul Rajan and Prakash,

Thank you for the support