[amsat-bb] Cubesat Vibration Test

[Glen Gardner]

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: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Robert Bruninga
> Sent: Wednesday, October 15, 2014 7:18 PM
> To: amsat-bb at amsat.org
> 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 AMSAT-BB at amsat.org. 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 AMSAT-BB at amsat.org. 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