Has anyone ever used the sedimentation with intent, e.g. to get a burn rate
modifier or fuel metal to preferentially settle?
On Wed, Jan 29, 2020, 4:29 PM Terry McCreary <tmccreary@xxxxxxxxxxxxxxx>
wrote:
When using vibration, be sure to use a sturdy (e.g, motor casing stock and
liner tube) to support the casting tube, if you're using liner and casting
tubes. Casting tubes may split along the seam under vibration. DAMHIKT.
:-(
I don't know whether sedimentation is significant if one vibrates for a
fairly short time---a few minutes. There does occur a layer of cured
"rubber" on the top of the tube.
Best -- terry
On 1/29/2020 12:04 PM, William Claybaugh wrote:
Anthony:
Thanks.
I’m thinking of a shaker table on to which the mixing bowl would be placed
during post-mixing vacuum processing. It seems likely it would need to be
nailed down for use but otherwise portable; a cart mount with heavy duty
tie downs seems possible for field processing.
I am familiar w/ the concrete “snake” vibrators (building reinforced
concrete water wells in North Africa) which also seem possible but strike
me as likely too messy and possibly too dangerous.
How does dual frequency work? On in each direction on a table?
Understand about gradients, that’s why I would do this before casting.
Bill
On Wed, Jan 29, 2020 at 10:43 AM Anthony Cesaroni <anthony@xxxxxxxxxxx>
wrote:
A combined magnetostrictive/piezo electric driver using 2 frequencies--
works well for this as well mixing BTW. Wilcoxin makes those drivers for
dynamic shakers and I have one setup in the lab. A large shaker table works
really well but they are heavy and expensive to move around. I’ve never
seen one with explosion proof electrics either so a barrier would be
required.
My guess is you don’t have access to equipment like that but they do make
some relatively inexpensive air driven, ball or piston type vibrators that
you can attach to a container directly. They also make tables that have
them integrated. The tables float on air cushions. You can change the
pressure to the motor and cushions to achieve the frequency and
displacement you desire. An accelerometer and a scope to read it is nice to
have as well.
That being said, it’s easy to end up with solid loading gradients if you
don’t characterize the process right.
Good luck.
Anthony J. Cesaroni
President/CEO
Cesaroni Technology/Cesaroni Aerospace
http://www.cesaronitech.com/
(941) 360-3100 x101 Sarasota
(905) 887-2370 x222 Toronto
*From:* arocket-bounce@xxxxxxxxxxxxx <arocket-bounce@xxxxxxxxxxxxx> *On
Behalf Of *William Claybaugh
*Sent:* Wednesday, January 29, 2020 12:26 PM
*To:* arocket@xxxxxxxxxxxxx
*Subject:* [AR] Vibratory compaction
Anyone have experience w/ vibratory compaction if solid rocket
propellant, with or without vacuum?
Initial search did not turn up anything specific....
Bill
Dr. Terry McCreary
Professor Emeritus
Murray State University
Murray KY 42071
