topic Re: Modal analysis results - Inventor FEA analysis package in Inventor Forum

Modal analysis results - Inventor FEA analysis package

Anonymous — Fri, 07 Apr 2017 18:29:03 GMT

Can someone please explain why the Inventor FEA Analysis (in Modal Analysis Mode) shows a 6+ inch deflection on a piece of 1/4" Stainless Steel?

Please see attached analysis results.

Thanks in advance.

TheCADWhisperer — Fri, 07 Apr 2017 18:53:35 GMT

I think displacement is meaningless in Inventor Modal Analysis.

Years ago they indicated they would remove the units and then never did.

Anonymous — Fri, 07 Apr 2017 19:08:06 GMT

So you're saying the results are simply exaggerated for viewing purposes?

If so, that's fine - I'll just let my client know that.

He builds large commercial AC units & wanted to make sure the fan/motor frequencies applied during operation didn't cause failures.

At least this analysis tells him what freqs to avoid.

Appreciate the insight.

TheCADWhisperer — Sun, 09 Apr 2017 14:56:32 GMT

@Anonymous wrote:

So you're saying the results are simply exaggerated for viewing purposes?.

You can adjust the visual representation of exaggeration - but it is my understanding that this is meaningless in Modal Analsysis.

Also (I didn't look at you attached report) be careful of analysis of long skinny parts.

Binga — Mon, 10 Apr 2017 12:46:23 GMT

@TheCADWhisperer is right. The deformation values in modal analysis is meaningless.