Sound absorbtion/proofing

[dejan95]

Hello everyone.

We have a problem with motor noise in production during the testing of the product (motor). We would like to decrease the noise in the tester and are looking at possible solution for sound proofing.

Currently we see three possible solutions:
1.) We add a lifting doors on a cylinder at the tester which close during the testing (problem is the cost - we would also require some safety sensors, so the doors don't hit the worker).
2.) We could add some sound absorption foam inside the tester (we don't know how much would this help. And it also looks a bit strange).
3.) We could add some kind of box (open from one side for the air flow) which we would lover over the motor with a cylinder during the testing.

Does anybody have any experience with similar issues. How did you solve them?

Thanks.

And have a nice day.

 

[MintJulep]

Looks like your test cell is already an enclosure. With big, flat, presumably plastic windows.

Are those windows acting as resonators, and actually amplifying the noise from the motor?

Try changing the size or thickness of the windows, or otherwise changing their natural frequencies.

What's the green thing? How much does that vibrate and contribute?

Mount the test platform on isolators.

Look into active noise cancellation. It has the great advantage of no moving parts.

 

[hydtools]

Are you trying to prevent direct transmission to the workers? Look at lead-loaded vinyl drapes to create an enclosure.

Ted

 

[BrianE22]

Do you need visibility all around? If not, acoustical absorbers work well:

https://www.mcmaster.com/products/acoustic-foam/

You could maybe cover the base with them. It will absorb some of the sound.

 

[dvd]

The_Acoustical_Uses_for_Perforated_Metals_Handbook

They used to provide a complete download, now it is by chapters.

 

[GregLocock]

If the motor is effectively rigidly mounted to the shelf in the cabinet then direct excitation of the structure may be the problem, in which case a rubber pad at each mounting pint will help. Any modern phone can run a spectrum analyser, this will give you some idea of which frequencies are annoying, and where they are coming from.

Cheers

Greg Locock


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