G3004 FATAL ERROR: Inventor 2024

ahilbert3PCG3 — Mon, 12 Jun 2023 10:25:26 GMT

I have a very large model. I have been able to create a mesh and run a modal analysis which got me the natural frequency for the assembly. (There are approximately 8K of parts between connectors(Bolts) and all components (components consist of solid machined parts and sheet metal parts). The design is of a console to be used shipboard. I have point loads applied throughout the console representing monitors and electronics. My next task is to take shock data retrieved from a barge test. This data has created approximately 84+ pages of data points. I have removed as much ancillary parts as possible. I have changed the mesh sizes where possible (some parts will not mesh unless the size is small). It takes approximately 3 hours to mesh the model then another 2+ hours for NASTRAN to create the file after which it crashes with the G3004 fatal error. I have changed the DECOMPMETHOD to PCGLSS and the SPARSEITERMODE TO 3 but I am still getting the same error. Is there a way to increase the number of words from 2.14B to a higher number?

Computer is a Dell 7750 with 64GB of ram. I set the virtual ram to 750MB. I had to do that in order to not run out of virtual memory (this happened while trying to run the modal analysis). Any suggestions will be appreciated.

Re: G3004 FATAL ERROR: Inventor 2024

John_Holtz — Wed, 21 Jun 2023 21:04:54 GMT

Hi @ahilbert3PCG3

These are the suggestions for G3004 from the Help:

G3004	FATAL ERROR: G3004	PROFILE LIMIT EXCEEDED
	Cause:	The stiffness matrix profile (non-zero terms) exceeded 2,147,483,647 words.
	Action:	Set the DECOMPMETHOD Model Initialization directive to PCGLSS and the SPARSEITERMODE model parameter to 3. If this does not correct the issue you must reduce the number of grid points in your model.

It sounds like your only option left is to further reduce the number of nodes.

The "sheet metal" parts should be analyzed using shell elements.
Any solid parts that can be combined in the Inventor modeling environment will eliminate the need for contact and may reduce the number of nodes in the parts. Parts that are the same material, touching, and won't come apart could be combined.
If a part will not mesh with a larger mesh size, perhaps some areas of it will mesh with a larger mesh size and a Mesh Control can be used to create a smaller mesh only where needed on the part.

The following are things that I did not understand in your description but have no effect on the G3004 errors.

You indicated that point loads were applied. Are those forces or concentrated mass? They need to be concentrated mass for the modal and vibration analysis.
What type of vibration analysis are you performing? Modal Transient Response? (I am assuming the 84 pages of measured data points are a time history. Is there a procedure to convert a time history to a power spectral density so that you can run a random response analysis?)

John

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G3004 FATAL ERROR: Inventor 2024

Re: G3004 FATAL ERROR: Inventor 2024