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Fun with materials

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HAL:

--- Quote from: steve on October 04, 2019, 03:42:46 PM ---
--- Quote from: HAL on October 04, 2019, 08:48:08 AM ---Fun with materials.

What happens when you put an accelerometer on a piece of MDF and hit it with a ballpeen hammer. Lets take a look.

Audio spectrum 64K point FFT of piezoelectric acclerometer with CLIO.

Love hitting stuff and see what happens! :)

--- End quote ---



Thank you Hal for performing the experiment and sharing the results with us. The results are quite interesting.
May I ask the type, thickness, size of the MDF? If proprietary, I understand.

Cheers and great weekend.

steve

--- End quote ---
Steve,
Standard 1/2" MDF from Lowes.  Nothing special.  Going to try the oak I used for another baffle and see what it does. in comparison.

steve:

--- Quote from: HAL on October 06, 2019, 07:46:58 AM ---
--- Quote from: steve on October 04, 2019, 03:42:46 PM ---
--- Quote from: HAL on October 04, 2019, 08:48:08 AM ---Fun with materials.

What happens when you put an accelerometer on a piece of MDF and hit it with a ballpeen hammer. Lets take a look.

Audio spectrum 64K point FFT of piezoelectric acclerometer with CLIO.

Love hitting stuff and see what happens! :)

--- End quote ---



Thank you Hal for performing the experiment and sharing the results with us. The results are quite interesting.
May I ask the type, thickness, size of the MDF? If proprietary, I understand.

Cheers and great weekend.

steve

--- End quote ---
Steve,
Standard 1/2" MDF from Lowes.  Nothing special.  Going to try the oak I used for another baffle and see what it does. in comparison.

--- End quote ---

Thanks again Hal. Comparing this to oak should be very very interesting. What L x W dimensions were used?

This is good information for those who are building their own speakers, even if dimensions are different. In this experiment, virtually no spikes except at very low frequencies, which can be remedied.

Cheers and thanks again Hal.

steve

HAL:
New test jig for sample testing.

rollo:
  A Mad Scientist you are Hal. Love it.

charles

HAL:
Have a new test setup built to start testing more samples sent by folks. 

Once I get it tweaked will post more data.  Also going to use some constrained layer damped materials to compare.  Should be interesting.

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