Simulating Vibrations

[MilesGregson1916]

Hello all,

I'm seeking some of your expertise and knowledge.

Basically i want to simulate external structural vibrations from a surface (a floor) through a special table/plinth with legs, is this possible with Fusion?

I have played with the model frequencies mode but I think this simulates air born oscillations and not vibrations generated from an object, in my case the floor.

The project is to try and minimize vibrations from music speakers reaching the source hardware (record player etc) situated on a special hifi rack.

If fusion can't simulate this I did wonder if any other Autodesk software can?

Here's hoping.......

Many thanks in advance.

Miles

[Andrew.Sartorelli]

Hi @MilesGregson1916
Interesting question! Modal analysis in Fusion 360 would give you the ability to see what frequencies have dominant impact on your object, judged by the modal mass participation of a specific frequency. Fusion Simulation does not however have the capability to perform a frequency response analysis to see how your object, were to respond to a certain harmonic frequency such as if you were playing a music with a consistent bass. This is something that can be done in Simulation Mechanical, which is one of our advanced FEA platforms.  In computational analysis there is a field known as NVH (Noise Vibration and Harshness) which is something not possible with Autodesk's current FEA portfolio. Most automotive companies will run this kind of analysis to make sure that road noise doesn't penetrate the passenger cabin.

Sometimes though, simulation may not be necessary or time effective for a given problem at hand. What are your possible solutions to the problem? And how can simulation effect the implementation of those solutions? Are there industry guidelines for this type problem that we can use as a start point or a benchmark? For things like pressure vessels we have industry groups  ASME that produce design and analysis guidelines.

Regards,

Andrew
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[MilesGregson1916]

Hello Andrew and many thanks for your response.

I agree that simulation may not be necessary and testing physical examples with accelerometers would be the best approach, which is what I have started doing but it would be great to be able to provide testing data with FEA software.

There are no industry guidelines that I know of but an in depth knowledge of acoustic engineering is helpful and careful material choices.

Would Simulation Mechanical be able to simulate a floor surface being vibrated at different frequencies with a 3 tiered rack made of various materials? If so I would like to investigate further. I already have a Product design suite license/subscription. Or I could upgrade my Inventor to Inventor Professional?

Regards

Miles

[Andrew.Sartorelli · Accepted solution]

Hi @MilesGregson1916,

We've got two packages that should be capable of doing ground motion, Simulation Mechanical and Nastran In-CAD. Nastran In-CAD might be a better option though since it sits inside of Inventor as an environment, whereas Simulation Mechanical is a standalone product. Here is a quick comparison between the two packages. Would it be OK if I have one of the application engineers could reach out to you directly to discuss the possibilities?

Regards,

Andrew

[MilesGregson1916]

Thanks for the information and yes please have an engineer contact me, probably best via email at the moment.

I'm very interested in investing into a mechanical FEA package.

Regards

Miles