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Nastran Solution Failed

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Message 1 of 8
Roelof.Feijen
Advisor
1067 Views, 7 Replies
‎06-23-2020 03:23 AM

Nastran Solution Failed

Roelof.Feijen
Advisor
Advisor
‎06-23-2020 03:23 AM

Hello,

 

Attached a simple model. Analysis created with Inventor Nastran 2021.

It has two Rigid connectors. One Rigid type, one Interpolation type.

When I run the analysis it gives me a "Nastran Solution Failed" message. When I accept that message the solver completes the analysis. I need to load the results manually.

When I set both Rigid connectors to the Rigid type it runs without a warning.

I ran this model also in previous versions of Nastran. Never ran into this "problem".

I hope it's reproducible and not related to my installation of Inventor Nastran 2021.

Roelof Feijen

If my post answers your question, please click the "Accept Solution" button. This helps everyone find answers more quickly!
Yoke.ipt
‎06-23-2020 03:23 AM

Nastran Solution Failed

Hello,

 

Attached a simple model. Analysis created with Inventor Nastran 2021.

It has two Rigid connectors. One Rigid type, one Interpolation type.

When I run the analysis it gives me a "Nastran Solution Failed" message. When I accept that message the solver completes the analysis. I need to load the results manually.

When I set both Rigid connectors to the Rigid type it runs without a warning.

I ran this model also in previous versions of Nastran. Never ran into this "problem".

I hope it's reproducible and not related to my installation of Inventor Nastran 2021.

Roelof Feijen

If my post answers your question, please click the "Accept Solution" button. This helps everyone find answers more quickly!
Yoke.ipt
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7 REPLIES 7
Message 2 of 8
John_Holtz
Autodesk Support
in reply to: Roelof.Feijen
‎06-23-2020 09:58 AM

John_Holtz
Autodesk Support
Autodesk Support
‎06-23-2020 09:58 AM

Hi Roelof,

 

The problem is reproducible, so it is not your installation. 

 

I have seen a similar problem but do not know what the solution is. As you indicated, the results are calculated and can be loaded. Compared to an analysis with the force applied directly to the model instead of the interpolation connector, the results are very similar. I think the results are correct, but the analysis may be "failing" when doing something after the results are created. In other words, the failure may not be significant.

 

I have reported the problem, so I will let the group know if development finds something relevant to the discussion.

 

 



John Holtz, P.E.
Global Product Support
Autodesk, Inc.

If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
‎06-23-2020 09:58 AM

Hi Roelof,

 

The problem is reproducible, so it is not your installation. 

 

I have seen a similar problem but do not know what the solution is. As you indicated, the results are calculated and can be loaded. Compared to an analysis with the force applied directly to the model instead of the interpolation connector, the results are very similar. I think the results are correct, but the analysis may be "failing" when doing something after the results are created. In other words, the failure may not be significant.

 

I have reported the problem, so I will let the group know if development finds something relevant to the discussion.

 

 



John Holtz, P.E.
Global Product Support
Autodesk, Inc.

If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
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Message 3 of 8
Roelof.Feijen
Advisor
in reply to: John_Holtz
‎06-23-2020 10:52 AM

Roelof.Feijen
Advisor
Advisor
In response to John_Holtz
‎06-23-2020 10:52 AM

Hello John,

 

Thank for testing.

I also noticed that when you generate the nas file and solve it in te Nastran Editor it doesn't give you a failed warning message or something else. That also gave me confidence in the results.

Roelof Feijen

If my post answers your question, please click the "Accept Solution" button. This helps everyone find answers more quickly!
0 Likes
‎06-23-2020 10:52 AM

Hello John,

 

Thank for testing.

I also noticed that when you generate the nas file and solve it in te Nastran Editor it doesn't give you a failed warning message or something else. That also gave me confidence in the results.

Roelof Feijen

If my post answers your question, please click the "Accept Solution" button. This helps everyone find answers more quickly!
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Message 4 of 8
ken.friesen
Participant
in reply to: Roelof.Feijen
‎03-23-2021 03:17 PM

ken.friesen
Participant
Participant
‎03-23-2021 03:17 PM

I had this same issue, also in Nastran 2021.

‎03-23-2021 03:17 PM

I had this same issue, also in Nastran 2021.

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Message 5 of 8
rlee6UNEM
Participant
in reply to: Roelof.Feijen
‎04-06-2021 01:29 PM

rlee6UNEM
Participant
Participant
‎04-06-2021 01:29 PM

I'm having the same issue in 2021. 

The error message is displayed when I have both types of connectors in my model. 

If all my rigid connectors are rigid OR interpolation I have no problem. Only when I mix the two. 

 

0 Likes
‎04-06-2021 01:29 PM

I'm having the same issue in 2021. 

The error message is displayed when I have both types of connectors in my model. 

If all my rigid connectors are rigid OR interpolation I have no problem. Only when I mix the two. 

 

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Message 6 of 8
Anonymous
in reply to: Roelof.Feijen
‎06-28-2021 11:02 AM

Anonymous
Not applicable
‎06-28-2021 11:02 AM

I'm also stuck with this issue on Nastran 2021. Has it been resolved yet?

 

When I use the Rigid type the results are skewed, but this error is preventing me from using the Interpolation type. I tried changing all connectors on the model to Interpolation type but this did not solve the error. 

0 Likes
‎06-28-2021 11:02 AM

I'm also stuck with this issue on Nastran 2021. Has it been resolved yet?

 

When I use the Rigid type the results are skewed, but this error is preventing me from using the Interpolation type. I tried changing all connectors on the model to Interpolation type but this did not solve the error. 

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Message 7 of 8
John_Holtz
Autodesk Support
in reply to: Anonymous
‎06-29-2021 01:50 PM

John_Holtz
Autodesk Support
Autodesk Support
In response to Anonymous
‎06-29-2021 01:50 PM

Hi @Anonymous 

 

There may be different issues with the interpolation connector, and it is not clear which issue you are encountering. Please clarify exactly what is happening in your analysis.

 

In Roelof's case, he was getting an error message (relatively early in the analysis if I remember correctly), but the analysis continued to run and was giving correct results. It looked like something was triggering Inventor to show an error message when no error had occurred. (Ha, a false negative!) 

 

If your analysis is behaving differently than Roelof's situation, I suggest you do the following:

  • create a new post with details of the problem.
  • zip the model (.iam and .ipt files) and attach it to the forum post.
  • confirm that you are using version 2021.3 of Nastran (that is the latest version of 2021, not that I know of any enhancements to the interpolation connector, but it is good to be using the latest version.)

 



John Holtz, P.E.
Global Product Support
Autodesk, Inc.

If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
0 Likes
‎06-29-2021 01:50 PM

Hi @Anonymous 

 

There may be different issues with the interpolation connector, and it is not clear which issue you are encountering. Please clarify exactly what is happening in your analysis.

 

In Roelof's case, he was getting an error message (relatively early in the analysis if I remember correctly), but the analysis continued to run and was giving correct results. It looked like something was triggering Inventor to show an error message when no error had occurred. (Ha, a false negative!) 

 

If your analysis is behaving differently than Roelof's situation, I suggest you do the following:

  • create a new post with details of the problem.
  • zip the model (.iam and .ipt files) and attach it to the forum post.
  • confirm that you are using version 2021.3 of Nastran (that is the latest version of 2021, not that I know of any enhancements to the interpolation connector, but it is good to be using the latest version.)

 



John Holtz, P.E.
Global Product Support
Autodesk, Inc.

If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius 😉
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Message 8 of 8
rlee6UNEM
Participant
in reply to: Roelof.Feijen
‎11-09-2022 10:33 AM

rlee6UNEM
Participant
Participant
‎11-09-2022 10:33 AM

This has been fixed in the 2023 version

‎11-09-2022 10:33 AM

This has been fixed in the 2023 version

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