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Sound absorbtion/proofing

Sound absorbtion/proofing

Sound absorbtion/proofing

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?


And have a nice day.

RE: Sound absorbtion/proofing

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.

RE: Sound absorbtion/proofing

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


RE: Sound absorbtion/proofing

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.


Greg Locock

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