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07-21-2016 11:22 AM

Good day,

I am trying to run a frequency/harmonic analysis and I get an error message which says: **A Tstep card in case control has an invalid set ID of 1.**

I have checked as a reference the video - https://www.youtube.com/watch?v=aRduXRq4TkA.

The video does not show how to insert results from a previous modal analysis.

I did not perform such analysis.

I therefore have a number of questions:

* What does the Tstep card refer to and how to solve this error?

* I understand that the harmonic analysis can be based on a modal analysis, or run independently. How can either option be selected?

* Are there any online examples showing all the steps required to perform a harmonic analysis?

Thanks

Best regards

Solved! Go to Solution.

8 REPLIES

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07-22-2016 02:37 AM

Modal Frequency Analysis of the Hinge Model

Frequency Response of Tower with Seismic Excitation

Also, a TSTEP entry is typically for transient analysis, not for frequency response. Are you sure you have chosen analysis type 4: Frequency / Harmonic Response when you setup the analysis.

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07-22-2016 03:36 AM

Good day, thanks for your message.

Yes, I had a look to the examples but I still was not able to solve this test.

Its true, trying with 4.Frequency/harmonic response the TSTEP warning is not a problem anymore.

Now,I get a new error message: USER FATAL MESSAGE 6683 (FRRD1A).

But it looks like more realistic.

Best regards

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07-22-2016 03:44 AM

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07-22-2016 09:22 AM

I am quite new with FEMAP-NASTRAN and I am still struggling around with my test cases.

In the .f06 I get the following error:**** USER INFORMATION MESSAGE 480 (XSEMIN)JOB TERMINATED DUE TO LACK OF SOL, COMPILE, OR LINK CARDS IN THE EXECUTIVE CONTROL SECTION.*But I am not sure what they mean with that and how to correct it. Can someone shed some light over that issue?.

Best regards

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07-22-2016 08:55 PM

Yes, it means you have not selected any analysis type (eg. statics, modes, frequency response etc.).

If you are new to Femap, then you should start with (all) the simple example problems. Follow each step. Then it will become easier for you to understand the basics of how it works, and why things may be going wrong. This will be time well spent.

I realise the examples are very geometrically simple models, but they do cover quite a few procedural points related to analysis setup, which is what your questions have been related to so far.

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07-27-2016 04:12 AM

Good day,

The modal and harmonic simulation has been succesfully performed.

Now, I am interpretating the results. The chart says plate top xy shear stress vs set value.

It is not clear for me what "set value" means.

Regards

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07-27-2016 08:58 AM

1. "Time" in a transient analysis;

2. "Proportion of Load" in non-linear static analysis;

3. "Frequency" in frequency response analysis;

So if things are as they should be, choosing "set value" in a Vector vs Output Set chart should produce a result vs frequency.

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07-27-2016 10:26 AM

Thanks, that makes sense.

What I have is a value (displacement, shear stress, acc,...) vs frequency.

Very good :-)

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