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 Posted: Fri Jun 15, 2007 3:28 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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On Jun 14, 2:00 pm, "Jim Oberg" <job...@houston.rr.com> wrote:
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This morning a pair of computers was brought up, and it ran seven minutes
before crashing again.
"Jim Oberg" <job...@houston.rr.com> wrote in message
news:4671436e$0$4718$4c368faf@roadrunner.com...
"John Doe" <j...@doe.org> wrote
Those media articles you pointed to are so full of exagerations.
Is there not a Progress docked ? And they also have a Soyuz that can, in
a bind, perform station orientation. They did it a few times on Mir.
The Progress engines are controlled by the computers that had crashed.
The Soyuz was able to steer the Mir in emergencies, briefly -- but
check your notes, ISS is much, MUCH more massive than Mir.
Some signs of recovery this morning -- question is, how enduring will it
be?- Hide quoted text -
- Show quoted text -
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It is 6:30 pm Central time. The NASA briefing makes it sound like the
computers are not fried but just unhappy with the new power. And the
good news is it will not be a big problem to go back to the old power
supply. Hopefully the fix will be this simple.
Danny Deger |
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John Doe
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| Posted: Fri Jun 15, 2007 4:35 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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dannydeger@hotmail.com wrote:
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It is 6:30 pm Central time. The NASA briefing makes it sound like the
computers are not fried but just unhappy with the new power. And the
good news is it will not be a big problem to go back to the old power
supply. Hopefully the fix will be this simple.
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Ex-squeeze me ?
If those new solar panels provided "strange" power then all of the
station would feel the ill effects of "strange" power.
Surely they have some voltmeter on the station and can measure the power
at the plug where those computers are connected ?
Surely the power converter between Z1 (us segment power) and the russian
segment would filter out anomalies in the USA power ? (Or at least
report on voltage levels on both sides and see some anomalies ?)
I find it extremely odd that this would be a power supply issue and this
is more likely parametrisation problems with the new mass distribution
of the station.
Unless of course, astronauts screwed up some grounding and Z1 is no
longer properly grounded. |
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Jim Oberg
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| Posted: Fri Jun 15, 2007 5:25 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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Real spacemen don't 'hope', they dig for truth.
And the inconvenient truth is that the computer troubles began BEFORE the S3
power was fed.
<dannydeger@hotmail.com> wrote
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It is 6:30 pm Central time. The NASA briefing makes it sound like the
computers are not fried but just unhappy with the new power. And the
good news is it will not be a big problem to go back to the old power
supply. Hopefully the fix will be this simple. |
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Guest
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| Posted: Fri Jun 15, 2007 5:53 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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On Jun 14, 8:25 pm, "Jim Oberg" <job...@houston.rr.com> wrote:
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Real spacemen don't 'hope', they dig for truth.
And the inconvenient truth is that the computer troubles began BEFORE the S3
power was fed.
dannyde...@hotmail.com> wrote
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This is very interesting news. Could it be NASA is not telling us
all? Is it possible NASA would tell a "non-truth"? Surely not :-)
Is it possible that the agency that lied about my behavior in 1999 to
have me detained against my will is once again lying?
We will have to wait and see.
Danny Deger |
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Craig Fink
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| Posted: Sun Jun 17, 2007 3:49 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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If they can't tell them to give me a call, it's as simple as picking two or
three of the right attitudes. That meet the important constraints the best.
I would think that they have enough control using the solar arrays. They
just added some real big ones. As the altitude drops, the Station
encounters more drag from the atmosphere. The solar arrays are like sails,
an old square rigger that can only sail downwind (downward). Just set the
sails correctly and attitude will be adjusted...
Bad attitude is no reason to abandon ship...
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"Jim Oberg"...
You're right, some new CMG control algorithms have been flight tested --
and I should call the company that sent out the boastful press release
a few months ago to see if they think they can do ALL required attitude
control...
It could happen...
"Craig Fink"...
I believe NASA already has the software or at least the algorithms to do
attitude maneuvers on the CMGs alone. If this capability is up and
running,
I would think they could desaturate the CMGs by maneuvering between two
or more attitudes keeping them reasonably desaturated. |
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neil.fraser@gmail.com
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| Posted: Sun Jun 17, 2007 8:16 pm Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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On Jun 14, 12:36 am, John Doe <j...@doe.org> wrote:
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If they leave the station, it means that its attitude control has become
uncontrolled. And it probably means that later on, station might be
thumbling and that means that docking to station would become nearly
impossible.
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Which (off topic) is one of the things which has always bugged me
about the movie 2001. All HAL needed to do was bleed some energy off
of the carousel which would cause Discovery to tumble end over end.
Bowman would have had a really tough job getting in to the emergency
airlock. |
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John Doe
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| Posted: Tue Jun 19, 2007 2:14 am Post subject: Re: NY Times, Computer Flaw Could Imperil Space Station |
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This gives a good general idea of how the computers are arranged. They
are fault tolerant and in a voting scheme.
My guess is that if all 3 computers are given erroneous information,
they would have no way to decide how to act and probably act like those
computers that Kirk managed to disable by just asking them some
difficult question. |
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