Monday, August 7, 2017

More Photos from Integration





My throne. 


Working on BABI at the Off Site Durham Scientific Ballooning Facility


Dan inspects BABI


Dan with a good looking GOAT


We realized, at the worst possible time, that one of our cables was wired incorrectly and had to rewire it so that we could test our payload.


Excited to actually attempt integration. Finally.


It's the North Cack, baby we're the boss. Carolina BBQ sauce with the slaw.


A very early morning after a very late night.


Kapton tape and a flat head screwdriver...the two items that are the toughest to find when you need them.


Dan and I visiting our friend Rosemary.



After so much time watching CSBF on the computer and so much effort spent trying to earn a trip to visit it, it was surreal to actually BE there.




Munir's photo face <3 


Jimmy giving pump down commands so that our SPEC sensors don't sploosh their guts all over the place. 


SPACE PUP!!! Heart eyes emoji.



A new look for Munir.


HASP and the BEMCO


One of my favorite parts of the trip was this badge. I could use it to get on base after hours and beep open doors.


A hang test in action.


Jimmy putting the finishing touches on GOAT for shipment to Fort Sumner.


Totally knackered student team lead.




Before


After!


Eat at Shep's.


A Jimmy's Eye View





On our way home!

Friday, August 4, 2017

Cleared for flight.

We have been (provisionally) cleared for flight. 

Whew.

The 'provisional' bit is due to our don't-use-the-pump "fix". We're content, even though we might be able to fix it with another heroic effort. We're a bit burned out, have neglected spouses etc. to tend to, and have school starting in a week, so we're buttoning the GOAT up for shipment to New Mexico for flight in a month.

-Jimmy

No one ever says "It's just like using an oscilloscope."

It has been quite a week.

We have spent two full days trying to figure out why our payload kept tripping the fuse. Startup current for our pump was popping the HASP fuse, so we've been trying a bunch of mitigation strategies: reservoir capacitors, a "slow start" to ease into our full current draw, installing our own fuse, and at one point we even considered flying a battery to even things out. None of them worked.

At this point in the project, the necessity of looking at our electrical profile under an oscilloscope became increasingly apparent to us. It seems obvious in retrospect, but given that none of us have ever done this before we can't be too hard on ourselves. To add a bit of insult to injury, the physics student and electrical engineering majors both needed to re-learn how to use one. ("There's a reason that the expression is 'just like riding a bicycle' and not 'just like using an oscilloscope'." -Julie) The LSU faculty were very accommodating. Actually, everyone's been amazingly accommodating. We've been swapping spare parts with the other teams in post-midnight hotel-room liaisons. The faculty advisor for UB spent hours going over our circuit diagrams for us and gave freely (thanks, Larry!) from his impressive stock of circuit components and gubbins.

Anyway, we discovered, once we re-learned how to use basic lab equipment, that our little pump is just noisy. as. hell.


This waveform isn't even from the initial surge required to get the pump going; this is what it looks like during regular operation. That little spike in the middle (it's kinda hard to see, but the darker line above the 'M' at the bottom) represents a few nanoseconds' worth of ~1.75 A draw. You may recall that we are fused to never exceed our current allotment of 0.5A. Our pump is blowing that out of the water, for very small time intervals, multiple times per second. We never noticed it through all our testing because we've been using standard multimeters, which don't register data at anything close to that level of fine resolution. We tried evening this out with some more circuitry magic, but weren't having any luck.

The upshot of all of this is that we decided to just leave our pump off permanently. We're not going to use it. Our payload is now chugging along happily without its centerpiece. The Bernoulli Air Bath Intensifier (BABI) will be as quiet and low-pressure as the rest of the payload. This is sad and disappointing, but vastly better than flying a brick of non-functional electronics, which in turn is worlds better than not flying at all. We passed pre-integration and integration again, GOAT is hanging out in the vacuum chamber now, and we're about to start chilling for the first part of the thermal test.

It's going to be a wonderfully slow day compared to the shrieking half-blind anxiety of the last few. We're updating our documentation, reading, and chatting with the other teams. If this goes well, then we will truly have reached the end of the work for this project. That's quite a feeling.

In celebration, permit me to share with you a picture of our electrical/software lead airing his feet out after a long day in the high-bay:



-Jimmy

Wednesday, August 2, 2017

Integration, Day 3

Monday we spent all day trying to re-factor the payload. (ALL. DAY.)

Tuesday we fixed things, scraped it together, and got integrated onto the gondola with only a couple hours left in the window.

Today we watched them load the gondola into the vacuum chamber (the 'Bemco') with a forklift. They then pumped it down, chilled it with liquid nitrogen, and pumped down again. Once we pumped below 100 millibar (a tenth of usual sea level atmospheric pressure) our 15 minute pump timer started ticking. 14 minutes and 30 seconds went by with good data coming down the pipe.



Then we died.

Current working theory is that we blew a fuse when the pump turned on. We're preparing some mitigation strategies but we don't get our hands back on the hardware for at least 2 more hours. Then, even when we fix the issue, we're gonna have to start all over again with pre-integration. We get one more shot at this on Friday. If we fail that then we can still fly, but we'd have to do some kind of tests on our own to prove to them that things aren't going to fail horribly. This is undesirable for many reasons, one of which is that this involves a lot more work.

The team is running out for food and then we'll see where we stand. For now, enjoy some pretty plots.
-Jimmy



Tuesday, August 1, 2017

We

Integrated!!!

Here we go

Everything is together

Aaaaaaaaaaaaa

oh sweet spacecat we're almost there aaaaaaaa we're almost there

DanK figured out a software issue that was making our sensors all wacky. We've put the GOAT together and... it's alive. We're reading out data. Our wiring is an embarrassment and we're exhausted, but it works. Holy wow. We're closing up and are minutes away from pre-integration.

For those of you not familiar with ballooning protocols, pre-integration is the checklist we go through before integration. Post any questions you may have about this in the comments section and I'll try to explain it.

Please keep sending good thoughts, Tootsie Rolls, and benevolent spells. I love you all.

It's always darkest before the...noon

Last night was a doozie. The rewire took longer than expected...longer than pi even...and the boys to men were awake until about 7 AM. After a few hours of sleep and a few hot showers they were back in action. We had a glum "weather briefing" and made the choice to sweat for another hour and then pack up to go CSBF and update Guzik. And theeeeennnn DanK solved the problem!! And we loaded up the van moved to Beverly. The drive was raucous. Now we're at CSBF assembling the GOAT. Spacecatspeed Space GOAT.

Having issues.

07:09 local time. Been wiring and debugging since 08:00. Need a couple hours of sleep before trying again. Not looking great right now.

It's 3 AM somewhere

Not here. Wrong time zone.

Monday, July 31, 2017

"The bigger the gob the better the job."



So. We landed in Houston, TX around 7:30 AM on Sunday as planned. We grabbed some "coffee" at the airport before being herded down to claim our giant pile of rolling suitcases from baggage claim, and then hung out to wait for Jimmy for an hour or so with some people who were going on a cruise.

When Jimmy came in we hopped in the car and had the finest lunch that Houston has to offer before 11 AM on a Sunday: Jack in the Box.

Then we took the advice of a few of my Houston folk and drove over to something called the Orange Show. It was super cool and hard to explain.








It was super weird and like a million degrees but we enjoyed it. I don't know why I look like I want to cry in this photo. I could be slightly delusional. My hair looks cute, though.





Munir doesn't look like he loves orange.



After that we needed a break for some air con so we went to a doughnut shop to cool down and stall some more while we waited for DanK.






Then we drove laps around the Houston airport for an hour while we waited for Dan to disembark. He was greeted with a hearty "Koris" of, "Yi! Yi!" (as is our custom) and then we drove the 2.5 hours to Palestine.

We agreed that it was sensible to check in and then eat some dinner, it sounds like all we're doing is eating but don't worry, that's about to change, and went to an Italian restaurant that the Innkeeper recommended. During light dinner conversation we uncovered a pretty substantial flaw in our science payload which caused us to race back to the hotel to get to work on sourcing the parts for the solution. Luckily the flaw was surmountable and we knew what we needed.


As is traditional, no naps were taken.



 We lucked out and found a place outside of Dallas, TX that had the parts that we needed. We decided to take the gamble that we'd be able to integrate on Tuesday and use Monday for a tiny road trip and some GOAT patching.

Monday morning we ate an amazing breakfast at the hotel and then! Went! To! CSBF!!!!!

We got our badges, checked in with Dr. Guzik to make sure we were ok to leave for Monday, and then, regrettably, got back in the minivan.


We dropped Munir, Jimmy and Dan at the hotel to work and then DanD and I headed the 2.5 hours to Mansfield, TX.



We spent about fifteen minutes at Mouser Electronics and then....got back in the car!!




ATM Jimmy is hand feeding us sugar snap peas, the room is covered in little bits of heat shrink, and we are listening to the Jurassic Park theme song. So, it's safe to say that things are all going according to the schedule.