Armadillo's rockets may not have been random vibration tested. As for
Masten's, that would depend on whether they had you driving the truck
down the dirt road to the test site <grin>
On 12/21/2015 8:26 PM, Ben Brockert wrote:
Professional shaker tables are still just big speaker cores. I visited
the one they use to test hardware in the mobile launch platforms at KSC,
and it's 'just' a 480kW amp and a fat coil of wire. You can build a
surprisingly realistic approximation with a subwoofer, amplifier, and
sine wave generator.
If NASA was cool they'd build a speaker cone for their rig and recreate
that scene from Back to the Future.
Things that flew without going through random vibe testing: all of
Armadillo and Masten's rockets. Though perhaps Armadillo could have
found that their GPS was sensitive to vibration if it had been tested
before flight.
On Monday, December 21, 2015, Robert Watzlavick <rocket@xxxxxxxxxxxxxx
<mailto:rocket@xxxxxxxxxxxxxx>> wrote:
That's weird - I would think any reasonable PCB would stand up to
vibration the same as any other. However, I have a BBB and just
looking at it, I would suspect the power and/or USB connections as
potential failure points. In a previous life, we had to delete the
planned vibration specs for a product the USB connector failed
vibration tests. Good to know though - thanks for the tip.
I was trying to figure out the best way to check out my flight
computer setup for vibration. I don't have access to a shaker table
so I thought I would strap it to my truck bumper and drive it around
for a while. A few miles over our pothole-laden roads should be a
pretty good test, at least for random excitation.
-Bob
On 12/21/2015 04:25 PM, doug knight wrote:
Not robust. Mount was good but jostling around the device had it
run intermittently. Worked well on benchtop but not repeatable at
launch site. And did not work at all in launches. Scraped and went
to arduino and problems disappeared. This was a couple years ago
also. Of course Arduinos have other limitations so
Doug Knight.
On Dec 21, 2015 3:25 PM, "Robert Watzlavick"
<rocket@xxxxxxxxxxxxxx
<javascript:_e(%7B%7D,'cvml','rocket@xxxxxxxxxxxxxx');>> wrote:
What kind of problems did you run into? I considered the
BeagleBone Black with FreeRTOS but ended up going with the
Netburner MOD54415.
Monroe - I glanced over the OSAL stuff a while back and it
looked very sophisticated but I don't think it's a turnkey
system. I think it's more a set of middleware building blocks
(messaging stack, file system, etc.). If you have the time to
invest in it, it would be interesting to see how useful it
turns out to be.
-Bob
On 12/21/2015 01:13 PM, doug knight wrote:
Monroe
I did not haveagood experience with beaglebones and hobby
high power rockets. They did not seem very robustly all.
Of course YMMV.
Doug Knight