[amsat-bb] Cubesat Vibration Test

[Goody K3NG]

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 <glen.gardner at verizon.net>
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: 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
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>> _______________________________________________
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>
> _______________________________________________
> 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
>