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Flex Prep Tool - Motion View - giving error while creating .h3d flex body. How to resolve?

Rohan Joshi

Invalid Node Selection!

Total Translation Warnings and Errors:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Warnings: 0
Errors: 1

child process exited abnormally

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English

MotionView/MotionSolve

OptiStruct

v2021.1

Accepted answers

Praful

Thanks for that screenshot.

I can see 2 possible causes. You may try eliminating one by one

A) The node number needs to be specified in either of the following format

511+512+513 (This is to specify an assorted list of nodes)
511:513 (This is to specify a range)
combination of 1 & 2. E.g. 6+8:15+67 <- includes node 6, 8 through 15 and 67

Check if this solves the problem.

I see your path contain spaces. Check if the problem goes away when you have files in path without space.

Regards
Praful

All comments

Praful

Hello Rohan

Is there a fem file that you can share ? Also a screenshot of the Flexprep dialog before you hit OK with interface nodes and other fields filled in ?

I suggest you to check the .out file to see if there are any specific messages from Optistruct, the solver that is used for the flexbody creation.

Regards

Praful

Rohan Joshi

Hello Praful,

Thanks for your quick response! Unfortunately, I cannot share the .fem file with you, however, I can share information/cards/sets etc from within the file with you as text entries.

Following is a screenshot of Flexprep dialog, we have been using this to generate flex bodies in the past, however, this one is giving errors.

The output thrown is the following:

******************************************************************************
** **
** Altair Flexible Body Preprocessor **
** **
** **
** Flexible Body Modal Synthesis and Data Translation Software **
** from Altair Engineering, Inc. **
** **
******************************************************************************
** Executable flexprep 2021.0.0.33
** Time of Build 18:16:28
** Date of Build Jan 14 2021
** Copyright (c) 1996-2020 Altair Engineering, Inc. All Rights Reserved.
Contains trade secrets of Altair Engineering, Inc. Copyright notice does not imply publication.
Decompilation or disassembly of this software is strictly prohibited.

******************************************************************************
Invalid Node Selection!

Total Translation Warnings and Errors:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Warnings: 0
Errors: 1

child process exited abnormally

Hope this helps you help me debug it! Please let me know if any further information is required, many thanks

Praful

Thanks for that screenshot.

I can see 2 possible causes. You may try eliminating one by one

A) The node number needs to be specified in either of the following format

511+512+513 (This is to specify an assorted list of nodes)
511:513 (This is to specify a range)
combination of 1 & 2. E.g. 6+8:15+67 <- includes node 6, 8 through 15 and 67

Check if this solves the problem.

I see your path contain spaces. Check if the problem goes away when you have files in path without space.

Regards
Praful

Rohan Joshi

Hi Praful,

Thanks for pointing out that my syntax was wrong. I jumbled up between software, in other places, it was 511,512,513 here it was supposed to be 511+512+513 This has helped me resolve, can't believe it was such a stupid blunder on my end.

Really appreciate your support in resolving this, thank you! Cheers

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