Polyethylene has a sound velocity of propagation of a shear wave about 4x the
speed of sound in air. So we have to be careful not to couple any of the
strike into the actual pipe itself. That was a surprising discovery.
From: Carl Peterson
Sent: Thursday, April 2, 2020 3:28 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] OT Project update
I would think you would want a strike. Like taking the solenoid from a starter
and using that to strike a metal disk. Disc would need appropriate waveguide
to interface with conduit.
On Thu, Apr 2, 2020 at 3:35 PM <ch...@wbmfg.com> wrote:
I hear it hurts.
From: Adam Moffett
Sent: Thursday, April 2, 2020 2:33 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Project update
Yeah....miniature thunder.
On 4/2/2020 4:04 PM, Ken Hohhof wrote:
I vaguely remember something from about 30 years ago, where they were using
focused ultrasound to break up kidney stones. It looks like the technical term
is focused ultrasound lithotripsy. My recollection is they used a high voltage
spark for the sound source.
High voltage spark sounds like it would be in your wheelhouse. Might not
work, but still sounds like fun.
From: AF mailto:af-boun...@af.afmug.com On Behalf Of Adam Moffett
Sent: Thursday, April 2, 2020 2:45 PM
To: af@af.afmug.com
Subject: Re: [AFMUG] OT Project update
What's this for anyway?
Big sharp noise through a pipe is what I believe you said you
wanted.....but what is the purpose?
I suppose a gunshot sounds sharp in human terms, but it's really rapidly
expanding gasses being released. In hindsight it makes sense that there would
be an initial burst followed by diminishing secondary noises. If that's an
issue, then aren't echoes in the pipe an issue too? I don't see how you would
avoid the echoes.
-Adam
On 4/2/2020 3:37 PM, ch...@wbmfg.com wrote:
Walther handgun will not fire power hammer loads. Does not seem to
strike the rim at all.
But a 1908 Savage rifle will.
Seems gunshots are not a sharp impulse. Just a burst of noise I have
discovered. No where near a perfect impulse.
So having fun and probably scaring people driving up the highway but on a
quest for a high quality shock wave/sound impulse.
Recording engineers use balloons and clappers.
I have a high power speaker driver coming. Going to see what happens
when I get close to blowing it out with a capacitor discharge.
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