Author Topic: BEAM Expansion on ISS - May 26-28, 2016  (Read 313011 times)

Offline Glom

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #80 on: 05/26/2016 12:21 pm »
This is clear a Ridley Scott piece.

Online Chris Bergin

Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #81 on: 05/26/2016 12:23 pm »
There's a risk they will postpone further work. They need daylight and ROBO isn't noticing any real expansion.
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Offline Hankelow8

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #82 on: 05/26/2016 12:24 pm »
It seems it is not expanding  on the pressure curve that they expected, and the concern is a large expansion instead of a steady expansion.

Offline docmordrid

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #83 on: 05/26/2016 12:31 pm »
Standing down for today. Capping sample port.
DM

Offline rds100

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #84 on: 05/26/2016 12:32 pm »
So why is a large expansion a concern? What ill effects could it cause?
Also can they budge the far end of the module with the canadarm a little, to free it if something is stuck?

Offline tdrb6115

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #85 on: 05/26/2016 12:33 pm »
Todays' progress in 1s

Offline mtakala24

Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #86 on: 05/26/2016 12:36 pm »
So why is a large expansion a concern? What ill effects could it cause?

Sudden jerk could exceed loads, ripping it to pieces or cause other damage.

Quote
Also can they budge the far end of the module with the canadarm a little, to free it if something is stuck?

Touching it could make it suddenly expand, it could exceed loads, rip it to pieces, and possibly damage the SSRMS (CanadaArm 2).

Offline SkipMorrow

Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #87 on: 05/26/2016 12:36 pm »
Not an expert, but if you are putting air into a closed (but expandable) container, you should see small increases in pressure along with expansion. If the pressure is increasing, but it isn't expanding, you have a situation where you have a lot of potential energy that could release suddenly and with unexpected results. Better to do it slowly and carefully.

Offline Jeff Lerner

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #88 on: 05/26/2016 12:38 pm »
Could this be some sort of stiction problem ??...the package had been packed tightly for a while and now needs to overcome friction fo expand ??

Offline Jet Black

Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #89 on: 05/26/2016 12:41 pm »
It could be. I'm sure they're working on it now.

Is it possible to withdraw air from the BEAM? or is it one way?
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Offline rds100

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #90 on: 05/26/2016 12:42 pm »
But they are never going to apply a pressure larger than 100kPa (or whatever the normal air pressure on the ISS is), right?
What forces could a mere 100kPa cause, to break a structure, that is designed to withstand hits by micrometeorites?

Offline Glom

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #91 on: 05/26/2016 12:46 pm »
Todays' progress in 1s
No axial movement. Maybe the struts didn't disengage?

Offline JimO

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #92 on: 05/26/2016 12:50 pm »
Under what conditions could they now open the hatch and examine the visible structure, and would that really tell them anything? If I were asked to do that I'd want to be suited up, but is there cooling available that far outside the airlock?

Offline Rocket Science

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #93 on: 05/26/2016 12:51 pm »
Straps, shades of Skylab!! :o
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Offline woods170

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #94 on: 05/26/2016 12:52 pm »
Todays' progress in 1s
No axial movement. Maybe the struts didn't disengage?
Look closely at the grapple fixture. It has moved roughly 5 inches outward along the long axis of the module. And given that the grapple fixture is mounted on the end-plate of BEAM... I hazard a guess and state that the struts have in fact disengaged.
« Last Edit: 05/26/2016 12:53 pm by woods170 »

Online Chris Bergin

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Offline MattMason

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #96 on: 05/26/2016 01:00 pm »
"When the moment is right...there's BEAM-O."

Statistically, it's true: 1 out of 3 expandable modules do suffer this problem of expansion dysfunction.



In seriousness, they're being extraordinarily cautious, and that's good. I've had irrational visions of BEAM expanding and then venting, sputtering across the sky like a balloon, complete with sound effects.

I'm not able to listen in. Are they officially calling it for the day? When's the next time we can get their BEAM on? ninja'ed by the quick-updated article--thank you!
« Last Edit: 05/26/2016 01:01 pm by MattMason »
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Offline ricmsmith

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #97 on: 05/26/2016 01:06 pm »
I wonder if they'll use the arm to extent or help extend it axially and pressurise it afterwards to expand it radially.

Offline MattMason

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #98 on: 05/26/2016 01:08 pm »
Straps, shades of Skylab!! :o

And where is Pete Conrad when we really need him?

Bigelow has had to know exactly how the strap releases work through tons of testing. I suspect the issue isn't the mechanical side but the procedural side. NASA needs assurance, and they want to crunch the numbers before proceeding.
"Why is the logo on the side of a rocket so important?"
"So you can find the pieces." -Jim, the Steely Eyed

Offline MattMason

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Re: LIVE: BEAM Expansion on ISS - May 26-28, 2016
« Reply #99 on: 05/26/2016 01:09 pm »
I wonder if they'll use the arm to extent or help extend it axially and pressurise it afterwards to expand it radially.

That would invalidate the whole technology demonstration of a self-expanding module.

And it would put the arm at risk. It's not designed to take stresses of a sudden high speed movement.
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