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Fun with materials

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dBe:
I’ve never seen (or heard) 11.5K be an issue in cabinets.  Granted, this resonance will probably shift downward with larger sizes. Even so it has been my experience that cabinet materials with their resonances are the most problematic below ~ 800Hz.  Cabinet hoot is really bad at about 400Hz.

HAL:
Yep, lower in frequency is worse for cabinet vibrations.  Having the accelerometer makes them easy to find.  Just run a log sweep on the speaker and measure the response on a panel with it attached.  Then you know what to work on to damp.     

Now to try some constrained layer damping materials and see what happens with other samples.   The CAE VB-2 from Parts-Express is already posted on the MEDEX sample. 

steve:

--- Quote from: HAL on November 21, 2019, 08:46:47 PM ---Yep, lower in frequency is worse for cabinet vibrations.  Having the accelerometer makes them easy to find.  Just run a log sweep on the speaker and measure the response on a panel with it attached.  Then you know what to work on to damp.     

Now to try some constrained layer damping materials and see what happens with other samples.   The CAE VB-2 from Parts-Express is already posted on the MEDEX sample.

--- End quote ---

Thanks for all your time and efforts Hal. Much appreciated. A couple of questions I would like to ask.

What was the thickness and L x W of the samples tested?

If these are small pieces, is it possible with your setup to perform a test on a larger piece, say 20 inches by
35 or 40 inches?

Thanks again Hal.

steve

HAL:
The samples are all 1" x 3" x stock material depth cut from the raw stock.

The Dremel vise is to small for larger panels to be tested. 

steve:

--- Quote from: HAL on November 22, 2019, 11:42:48 AM ---The samples are all 1" x 3" x stock material depth cut from the raw stock.

The Dremel vise is to small for larger panels to be tested.

--- End quote ---

Thanks for providing the information Hal. I, personally, found the info. interesting and useful indeed.

cheers

steve

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