I don't have anything to add to the discussion, I just wanted to say I love threads like this and I'd like to see more. I'll never be a rocket scientist, but reading about all the design considerations, experiences, testing, trials and tribulations, and minutia involved in engineering and launching these things is cool.
73 Goody K3NG
On Thu, Oct 16, 2014 at 9:19 AM, Glen Gardner [email protected] wrote:
This is why you do the shake tests.
Two thoughts come to mind here...
building for 25 G vibration and 1000 G shock is pretty much consumer grade stuff and is easily achieved with off the shelf components.
The hard part comes in when you realize that riding on a solid rocket motor is brutal, and results in resonances that sweep through a wide range of frequencies during the burn. The vibration tables generally emulate this really well and weaknesses can be exposed in short order. If the circuit boards exhibit a resonance , components can literally be popped right off of the board... and sometimes weaknesses internal to the die bonding in some components can turn up as well.
If I had to rely on conformal coating to stake the parts for 22G, I'd be worried about the payload....
Glen AA8C
On 10/16/2014 01:01 PM, Harvey N. Vordenbaum wrote:
No conformal coating? hv
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Robert Bruninga Sent: Wednesday, October 15, 2014 7:18 PM To: [email protected] Subject: [amsat-bb] Cubesat Vibration Test
To see the violence that a cubesat has to go through, here is a test we did today on a power supply board.
http://aprs.org/psat/Vibe-coil-test1724.MOV (1 meg file)
It failed even before we got to the 22G requirement!
Yes, it is rocket science… a nasty place to ride…
Bob, WB4aPR _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb