What's up with Ares?
What's up with Ares?
(OP)
Just read another grim reaper article about the new Ares booster being so prone to severe vibration it may never become man-rated. Anyone hear any good news about it recently?
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RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
http://www.spaceref.com/news/viewnews.html?id=1244
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
What is tough is that have lengthened the SRB, relative to the shuttle SRB, by one segment or so, so in addition to lowering the organ-pipe resonant frequency, the longer length de-tuned whatever dead space (I think is was near the nozzle) they had left as a damper. Yes, they can fairly easily re-tune that dead space to damp the longitudinal mode, but it will probably require increasing the length (and thus dead weight) of the motor. Also, knowing whether the fix works or not requires more firing tests, which are expensive and take time. Apparently, the tuned mass damper is an option too - see
ht
FWIW, I worked at Rocketdyne in the early '80's and had the opportunity to discuss the F1 engine's stability with a few of its original designers. The big secret about that engine is it was never really fully stabilized (ok, that's an arguable point, I know, but I'm talking about verbal opinions here, not press-ready official NASA statements) ...it was just made more stable than its initial design (although, describing stability for rocket engines is not exactly a science either). They did also build a few extra 10th's of an inch of copper on the injector faceplate, so that the erosion that occurred there during firing (attributed to a swirling/spinning 1st tangential mode oscillation) wouldn't have a chance to fully burn thru the injector face before the mission duration was up...plus a little extra for margin.
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
I magine that it's pretty important that both boosters fir simultaneously along their length.
(Light the blue touchpaper and run like billy-o?)
"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams
RE: What's up with Ares?
Big roman candle throwing flame and sparks down the center hole. See http://yarchive.net/space/shuttle/srb_ignite.htm for a good quick description.
"Imagine that it's pretty important that both boosters fire simultaneously along their length."
Yes. One of the reasons for going away from a multi-motor rocket for the Ares, as the failure mode (one motor failing on ignition) is not recoverable (loss of vehicle and crew) for the Shuttle. Having an escape tower/rocket pod for the crew capsule is another "new" feature for the Ares.
RE: What's up with Ares?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
"I love deadlines. I love the whooshing noise they make as they go past." Douglas Adams
RE: What's up with Ares?
Both of those numbers are possible in SIMPLE systems. Rather excitingly they are turning a single degree of freedom system into a 3 DOF one.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: What's up with Ares?
Apparently successful full duration test Thursday. No mention of problems.
Press release.
Link with much cooler pictures:
http://www.spaceflightnow.com/news/n0909/10ares1/
RE: What's up with Ares?
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