Author Topic: Fun with materials  (Read 3961 times)

Offline HAL

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Fun with materials
« 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! :)

Offline Nick B

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Re: Fun with materials
« Reply #1 on: October 04, 2019, 09:42:47 AM »
Thatís an interesting and fun test.... and also useful if youíre having a bad day  :D 🔨 
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Offline jimbones

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Re: Fun with materials
« Reply #2 on: October 04, 2019, 09:46:15 AM »
Hal, I want to get some accelerometer's to start experimenting, could you recommend some?
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Offline HAL

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Re: Fun with materials
« Reply #3 on: October 04, 2019, 03:15:31 PM »
Digikey has one like the Audiomatica CLIO version that needs power to run.  Has a different connector, so will not work directly with CLIO.  It does have sensitivity data usually.

https://www.digikey.com/product-detail/en/te-connectivity-measurement-specialties/1-1001220-0/MSP1001-ND/279641

They sell a preamp, but that has a lot of gain that might not be what is needed.

Hope that helps.

Offline steve

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Re: Fun with materials
« Reply #4 on: October 04, 2019, 03:42:46 PM »
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! :)

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
« Last Edit: October 04, 2019, 03:45:28 PM by steve »
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Offline HAL

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Re: Fun with materials
« Reply #5 on: October 06, 2019, 07:46:58 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! :)



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
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.

Offline steve

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Re: Fun with materials
« Reply #6 on: October 06, 2019, 09:30:22 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! :)



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
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.

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
« Last Edit: October 06, 2019, 09:38:31 AM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline HAL

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Re: Fun with materials
« Reply #7 on: October 06, 2019, 12:16:02 PM »
New test jig for sample testing.

Online rollo

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Re: Fun with materials
« Reply #8 on: October 09, 2019, 11:36:23 AM »
  A Mad Scientist you are Hal. Love it.

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Offline HAL

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Re: Fun with materials
« Reply #9 on: November 14, 2019, 05:24:49 AM »
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.

Offline steve

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Re: Fun with materials
« Reply #10 on: November 14, 2019, 08:55:47 PM »
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.

Yes indeed. Looking forward to your experiments and data Michael.

cheers

steve
« Last Edit: November 14, 2019, 08:57:22 PM by steve »
Steve Sammet (retired, owner, SAS Audio Labs)
"V" Very Low Capacitance ICs, 40pf 1 meter
SAS Audio Labs Test Phono Stage
SAS Audio 11A Tube Reference Preamplifier
SAS Audio Labs 25 W Triode Reference Monoblocks
2 way test Spkrs, 28 - 20khz  -3db (28hz)

Offline HAL

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Re: Fun with materials
« Reply #11 on: November 15, 2019, 04:52:21 AM »
Ummm.  I am Rich not Michael.

Offline Guy 13

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Re: Fun with materials
« Reply #12 on: November 15, 2019, 05:02:18 AM »
Ummm.  I am Rich not Michael.


 :rofl:

 :duh

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Offline AJ Soundfield

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Re: Fun with materials
« Reply #13 on: November 15, 2019, 06:59:12 AM »
Ummm.  I am Rich not Michael.
I thought you were HAL???

I've been tempted to take a hammer to some of my creations on more than one occasion. Not for testing though...
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Offline HAL

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Re: Fun with materials
« Reply #14 on: November 15, 2019, 07:32:55 AM »
Stands for Hollis Audio Labs.  I am Rich, you can call me HAL.

Dave, I cannot do that...